Optimization of Multitrain Brackish Water Reverse Osmosis ...
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th … · •Recent statistics indicates that currently...
Transcript of WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th … · •Recent statistics indicates that currently...
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
WATER ARABIA 2013
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BASIC DESIGN OF DESALINATION PROCESS
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CONSULTING
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9.00 Introductions
9.15 Desalination Market
• General views of the desalination market
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Rising standards of living –
Liters of Water Per Person Per Day
0
50
100
150
200
250
300
350
400
450
1981 1991 2001 2011
Scotland
Bahrein
Indonesia
–General views of the desalination market
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Increasing demands on the world’s resources World population - over 10 billion by 2050
Rising Worldwide Population 000 m3 per caput
0
20
40
60
80
100
120
AFRICA EUROPE Latin
America
1950
2000
–General views of the desalination market
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CONSULTING
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• Recent statistics indicates that currently
2.3 billion people live in water stressed areas.
• 1.7 billion live in water scarce areas with less than 1,000 cubic
meters per person per year.
Increasing pressure on the environment
–General views of the desalination market
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CONSULTING
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Global contracted capacity
RO
NF
MSF
MED
EDI
ED
By technology By water type
RO 49%
NF 5%
MSF 22%
MED 22%
ED 1% EDI 1%
SW
WW
BW
PW
RW
SW 65%
WW 7%
BW 15%
RW 8%
PW 5%
–General views of the desalination market
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CONSULTING
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A growing market and a changing
situation
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CONSULTING
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Technology trends 1970 -2004 –General views of the desalination market
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CONSULTING
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Contracted capacity in ME&A a
couple of year ago
RO
NF
MSF
MED
By technology By water type
MSF 46%
NF 3%
RO 46%
MED 5%
SW
WW
BW
SW 87%
WW 4%
BW 9%
–General views of the desalination market
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CONSULTING
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Proportions of the processes (seawater)
–General views of the desalination market
11
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CONSULTING
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12
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CONSULTING
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CONSULTING
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Energy prices reverse desal trends
• Thermal processes are likely to continue to dominate the industry in the Gulf region over the next decade. thanks to MEGA project This is due to potential of cogeneration of power and water
• MED is gaining market share (from 15% to 21 % share of thermal market in new projects)
• Outside Gulf region, RO is dominant
* Water Desalination Report and Global Water Intelligence
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CONSULTING
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Forecast desalination capacity by region –
future projects (2006-2010)*
57%
37%
53%
* Water Desalination Report 15
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CONSULTING
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Desalination plant Basic
Mass Balances
16
CONSULTING
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CONSULTING
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Desalination plant Basic Mass Balances
Regardless of the type of process
adopted desalination transforms
seawater into concentrated brine and
distillate (or permeate) by using energy : 17
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CONSULTING
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2) salt conservation (overall salt balance )
ddbdbdswsw mmm
1) mass conservation ( overall mass balance )
= Salt concentration ( kg / kg )
= Mass flow rate ( kg / sec )
m
Mass Balances relationships
mmm dbdsw
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
sw
bd
bdCf
Definition of concentration factor :
ratio between blowdown and seawater salt
concentration
Mass Balances relationships
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CONSULTING
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Cfmmbd
swD
11
Mass Balances relationships
Rearranging equation 1) and 2)
and using the definition of concentration factor we
can obtain a formula relating seawater requirement and
product distillate capacity
Note this formula is valid for all types of
desalination processes including RO
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CONSULTING
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21
Recovery ratio and concentration factor
F
CC
C
F
CC
F
CCFPPCCFF
CF
TDS
TDSQ
QTDS
TDSQ
RR
TDS
TDSQQTDSQTDSQTDSQ
Q
QQRR
F
C
FC
TDS
TDSTDSRR
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CONSULTING
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22
• A glance to other technologies : Concentration
factor – production ratio for RO system
82.145.01
1
1
1
RRCF
Concentration factor – production ratio
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CONSULTING
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Comparison of concentration factor CF
(seawater) for different processes
MSF MED VC RO
Recovery (Y%) 30 – 5 40 – 50 40 – 50 35 - 45
1,4 – 2 1,6 – 2 1,6 - 2 1,5 - 1,8
Y - 11 # CF
Concentration factor
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CONSULTING
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Mass Balances relationships
But ….. Then why seawater consumption for
SWRO technology is much lower than for thermal
?
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
5000 m3/h 1850 m3/h
10 MIGD SWRO vs THERMAL
18000 m3/h
8000 m3/h
10000 m3/h
1850 m3/h
Mass Balances relationships
Distinguish between overall SW flow rate to thermal plant and
make up flow rate
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CONSULTING
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26
Quantity of seawater needed to produce 1 m3 product water by different processes
Seawater requirement
MSF MED MED-TVC RO
Cooling water 8-10 5-8 2.3-5 0
Process water (make-up feed
water) 2.7-3 2.7-3 2.7-3 2.3-2.9
Pretreatment backwashing
losses 0 0 0 0.15-0.3
Brine discharge 1.7-2 1.7-2 1.7-2 1.3-1.9
Cooling water drain 5-7.3 2.3-5 0.5-2 0
Tonnes of seawater
required per tonne of
distillate water
8-10
5-8
5-8
2.5-3.2
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Concentration factor – production ratio :
theoretically it would be best to concentrate as
much as possible
However it is not possible to concentrate seawater
– blowdown above a certain limit.
The following constraints occur :
scale precipitation in tube bundle are more
frequent the more salt is concentrated
Mass Balances relationships
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CONSULTING
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• Experience with all systems indicated need for scale
control
• Hot brines easily reached saturation with inorganic
species (Mg(OH)2, CaCO3, CaSO4, etc.)
• Scale restricted flow paths, reduced heat transfer,
caused outages
Concentration factor – production ratio
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Concentration factor – production ratio
Technical limit
due to scale
precipitation Concentration factor depends on
initial SW TDS
Technical MSF
concentration
factor in the ME
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
A glance to ro technologies : Concentration factor
– production ratio for RO system
Typically the recovery rate for a SWRO is 38%
to 45%
concp
p
SW
p
mm
m
m
mRR %100%100
Concentration factor – production ratio
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
A glance to other technologies : Concentration
factor – production ratio for RO system
permcon
swcon
TDSTDS
TDSTDSRR
82.145.01
1
1
1
RRCF
Concentration factor – production ratio
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CONSULTING
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Working example: classroom exercise
Sea Water TDS = 45400 mg/l
Desired distillate flow = 1200 tons/hr
Data available:
Brine blowdown
max admissible TDS = 58000 mg/l
Calculate :
- brine blowdown flow rate
- seawater make up requirement
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CONSULTING
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Working example
Step 1: Calculate blowdown concentration factor:
Step 2 calculate seawater make flow rate:
277.145400
58000
mg
l
l
mgCf
bd
217.0277.1
111200
XX
hr
tons
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CONSULTING
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Seawater make up flow rate:
hr
tons
hr
tonsX 5530
217.0
1200
Calculate blow down as the difference between
make up and distillate
hr
tons
hr
tons
mmm dswbd
4330)12005530(
Working example
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CONSULTING
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Energy input classifications
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CONSULTING
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Evaporative processes use thermal energy to
produce distilled pure water from sea or
brackish water.
Energy input classifications
Evaporative processes
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CONSULTING
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Evaporative processes rely on a phase change from
liquid (in this case brine) to the vapour phase.
In this process only the water molecules pass to the
vapour phase leaving the other constituents behind in
the liquid.
The two dominating systems that have evolved are
Multi Stage Flash (MSF) and Multiple Effect
Distillation(MED).
Energy input classifications
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CONSULTING
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Energy input classifications
Membrane processes
In Membrane processes electric energy is used to
pump seawater (or brackish water) through a series
of semi permeable membranes to obtain a low
salinity permeate as a product.
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CONSULTING
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Energy balance in desalination processes :
the second law
of thermodynamics
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CONSULTING
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Energy input classifications
Membrane processes do not rely on a phase change but
on the size and transport mobility of water molecules
through a permeable membrane.
For the separation of fresh water from seawater or
brackish water this process is known as Reverse
Osmosis (RO).
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41
Energy input : Desalination processes
Desalination
Thermal
family
Membrane
family
MSF
(multi stage flash)
MED
(multiple effect
Desalination)
Once throughCross flow
Antiscale treat
Acid treated
Antiscale –
Acid mixed
treatment
Brine
recirculation
Blowdown
extraction
MED-TVCCondensing
MED
Horizontal
falling film
Vertical tubes
Plate type
Hollow fibres Spiral wound
Open seawater
Clarifier +
sand filtration
Clarifier +
Membrane
filtration
Sand
filtration
beach wells
ultra filtration
Desalination
Thermal
family
Membrane
family
MSF
(multi stage flash)
MED
(multiple effect
Desalination)
Once throughCross flow
Antiscale treat
Acid treated
Antiscale –
Acid mixed
treatment
Brine
recirculation
Blowdown
extraction
MED-TVCCondensing
MED
Horizontal
falling film
Vertical tubes
Plate type
Hollow fibres Spiral wound
Open seawater
Clarifier +
sand filtration
Clarifier +
Membrane
filtration
Sand
filtration
beach wells
ultra filtration
Conventional
Hybrid systemMSF-RO MED-RO
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42
• Cost effect : SWRO CAPEX and OPEX are greatly affected by : • seawater TDS
• Potable water quality
Technologies and differences: some rule of thumb
• Cost effect : Thermal CAPEX and OPEX are only partially affected by :
– seawater TDS
– And practically not affected by potable water quality up to TDS of 25 ppm
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
RR α 1/TDS SW
TDS
5000
45000
RR
RR
75%-85%
40-45%
seawater TDS
CA
PE
X-O
PE
X
MSF
SWRO
45000=48000 ppm
MSF-MED
Technologies and differences: some rule of thumb
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44
CA
PE
X-O
PE
X
Potable water quality
SWRO
Double
Pass SWRO
MSF- MED
Potable water TDS
SWRO
Double Pass +
polishing
SWRO
Single Pass
SWRO
Double Pass
Technologies and differences: some rule of thumb
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45
Energy consumption of status of art desalination projects The main problem is that specific energy consumption for SWRO is directly proportional to the seawater
salinity
0.00
5.00
10.00
15.00
0 2000 4000 6000 8000 10000 12000
Feed salinity, ppm TDS
Pre
ss
ure
, b
ar Feed pressure
Osmotic pressure
Effect of feed salinity on osmotic pressure and required feed pressure in RO unit
Technologies and differences: some rule of thumb
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CONSULTING
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46 Effect of feed salinity on specific power consumption in RO unit
0
2
4
6
8
10
12
35000 40000 45000 50000 55000 60000 70000
min
max
Energy consumption of status of art desalination projects
The main problem is that specific energy consumption for SWRO is directly
proportional to the seawater salinity, therefore it is not a suitable solution with high salinity
seawaters
Technologies and differences: some rule of thumb
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CONSULTING
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Page 47
hd
Condensing Turbine
Dual P HRSG
Back pressure Turbine,
Dual P HRSG
47
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CONSULTING
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Page 48
Desalination technologies energy consumption thermal and electric power
cogeneration Specific
electric
power
Specific heat
consumption
Steam
Extraction
pressure
Thermal
energy
Equivalent
power loss
Total Energy
requirements
Kwh/m3 kJ/kg Bar abs Thermal
kwh/m3
Electric
kwh/m3
kwh/m3
SWRO(Med
iterranean
Sea)
3.5 0 N.A. 0 0 3.5
SWRO
(Gulf)
4.5 0 N.A. 0 0 4.5
MSF 4.5 287 2.5-2.2 78 10-20 14-25
MED-TVC 1.0-1.5 287 2.5-2.2 78 10-20 11-21.5
MED 1.0-1.5 250 0.35-0.5 69 3 4-4.5
48
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CONSULTING
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Energy consumption of status of art desalination projects
20
4.5
10
4
20
1.5
10
1
1.5
3
1
0
4.5
0
3.5
0
5
10
15
20
25
MSF
cogeneration
MED TVC
cogeneration
MED
cogeneration
SWRO SWRO
Thermal energy converted in
equivalent electric energy
Electric power
Kw
h/m
3of
dis
tilla
te p
rodu
ced
Desalination plants are very energy intensive processes !!!
49
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CONSULTING
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50
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CONSULTING
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0
0.5
1
1.5
2
2.5
3
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2
power price [US$/kwh]
To
tal W
ate
r V
O&
M
co
st
[us$/m
3]
Total costs MSF (US$/m3)
Total costs MED (US$/m3)
Total costs RO (US$/m3)
51
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CONSULTING
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Clean technologies with renewable energy
For thermal desalination the
steam extraction conditions
are extremely important for
the energy associated to the
steam value…. The lower the
pressure and temperature
the better for efficiency
purpose
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CONSULTING
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Clean technologies with renewable energy
The problem is ….
mlt TAKH
ΔH = energy exchanged
kJ/sec
Kt = overall heat transfer coefficient
kJ/m2°C
A= overall heat transfer area
m2
∆Tml = Delta Temperature (media logarithmic) between the streams °C
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Clean technologies with renewable energy
- no capillary condensation takes place inside the pores - only vapor pass through the membrane - the membrane must not alter vapor equilibrium
Membrane Distillation (MD) is a separation technique which joints a
thermally driven distillation process with a membrane process.
MEMBRANE
Vapor
Vapor
Vapor
The membrane should be:
• porous
• not be wetted by process liquid
• hydrophobic material (PP – PTFE)
The driving force is a vapor pressure difference
J = f(∆p˚) J = f(∆T)
Membrane pore supports the vapor-liquid interface
The thermal energy is used for phase changing
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013 Clean technologies with renewable energy
0
10
20
30
40
50
60
70
80
90
100
Nu
mb
er
of
stu
die
s
DCMD AGMD VMD SGMD
- Direct Contact Membrane Distillation
(DCMD)
- Air Gap Membrane Distillation
(AGMD)
- Sweeping Gas Membrane Distillation
(SGMD)
- Vacuum Membrane Distillation (VMD)
Membrane Distillation (MD) system
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013 Clean technologies with renewable energy
Solar Desalination coupled with Membrane distillation
- The operating temperature of the MD process is in a range (60 ÷ 80 ˚C) where thermal flat plate collectors have a sufficient efficiency
- Various solar pilot MD plants have been designed and proposed.
Aqaba,
Red Sea, Jordan
Gran Canary,
Spain
Design capacity [l/day] 700 -900 1000-1500
Collector area [m²] 72 90
PV area [kWp] 1.44 1.92
Membrane Distillation (MD) system
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013 Clean technologies with renewable energy
Low temperature Distillation (LTD) system
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013 Clean technologies with renewable energy
Pilot plant in El Gouna
Low temperature Distillation (LTD) system
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CONSULTING
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> WS LTD Flow Sheet
Clean technologies with renewable energy
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CONSULTING
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> WS LTD Process Clean technologies with renewable energy
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CONSULTING
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> WS LTD Process Clean technologies with renewable energy
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CONSULTING
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> WS LTD Process Clean technologies with renewable energy
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CONSULTING
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A small plant in Almeria totally solar
Clean technologies with renewable energy
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64
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65
Technologies and differences: some rule of thumb
potable water quality
MSF
MED
RO 1st pass
RO 2nd pass
RO 2nd pass
+ polishing
TDS [ppm] 5-30 5-50 100-500 (*) 25-100 < 20 ppm
Possibility of
High purity
extractions
Yes Yes n.a
n.a
n.a
By products No No boron
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CONSULTING
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Overview of Desalination
Driven Technologies
66
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
• Cost effect : SWRO CAPEX and OPEX are greatly affected by : • seawater TDS
• Potable water quality
Technologies and differences :
some rule of thumb
Cost effect : Thermal CAPEX and OPEX are only partially affected by :
– seawater TDS
– And practically not affected by potable water quality up to TDS of 25 ppm
67
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CONSULTING
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RR α 1/TDS SW
TDS
5000
45000
RR
RR
75%-85%
40-45%
CA
PE
X-O
PE
X
1/ Potable water quality
Double
Pass
Single
Pass
seawater TDS CA
PE
X-O
PE
X
MSF
SWRO
45000
SWRO
MSF- MED
Technologies and differences :some rule of thumb
MSF-MED
68
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Overview of thermally driven technologies
Multi stage flash Dominant technology world-wide
69
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CONSULTING
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Overview of thermally driven technologies
Multi stage flash
70
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CONSULTING
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Overview of thermally driven technologies
Multi stage flash
71
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CONSULTING
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Overview of thermally driven technologies
Multi stage flash
72
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CONSULTING
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Overview of thermally driven technologies
Multiple effect desalination
Evolved from small installation
To relatively large unit size
73
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CONSULTING
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Overview of thermally driven technologies
Multiple effect desalination With Thermo compression
74
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Condensing
75
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CONSULTING
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Reverse osmosis
Dominant technology when power
plant is not associated to desalination
Overview of desalination technologies
76
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77
Condensing
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78
Steam 2.4 bar
Steam 0.4 bar
Thermo compressor
Distillate pump
Distillate pump
Condensing MED
MED TVC
condenser
condenser
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79
In fact as it can be seen from the enclosed energy
flow diagram the great part of the heat input to the
MSF system is returned back to the sea with the
seawater drain stream.
Energy effect
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80
Energy effect Steam from the Power
Plant 100%
Seawater Drain 74%
Condensate back to the
power plant 17%
Brine blow down 5%
Distillate 2.6%
Radiation, Vent losses,
others 1.4%
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Association with power plant
Boiler MSF
MSF big
kettle” B
OIL
ER
B
OIL
ER
Steam
Turbine
Condenser
fuel
fuel
Distiller
Cogeneration
81
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Power thermal desalination
combinations
MED
MED
MED
Steam
HR
SG
H
RS
G
Gas
Turbine
Steam Turbine
Overview of desalination technologies
82
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Power and SWRO plant
combinations
condenser
Steam
HR
SG
H
RS
G
Gas
Turbine
Steam
Turbine
SWRO
Separate SWRO
Overview of desalination technologies
83
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
The Energy Situation
30.5
4.5
30.5
1.5
10
4.5
10
1.5
4.5
0
5
10
15
20
25
30
35
MSF stand alone MED stand Alone MSF cogeneration MED cogeneration SWRO
Thermal energy converted in equivalent
electric energy
Electric energy
Kwh
/m3 o
f d
isti
llate
pro
du
ced
Big kettle
Overview of desalination technologies
84
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
• Studies have been carried out showing that potable water with
TDS lower than 500 mg/l could be obtained with less than 2.5
kwh/m3
• Minimum bottom threshold for power requirements for SWRO
is 1.2-1.5 kwh/m3
Overview of desalination technologies
85
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The Energy Situation
30.5
4.5
10
4.5
3
1.5
01.5 0.60
5
10
15
20
25
30
35
MSF stand alone MEF Cogeneration MED condensing MBR Solar
sp
ecific
en
erg
y consumption
[kw
h/m
3]
Electric energy
Thermal energy converted in equivalent
electric energy
Overview of desalination technologies
86
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Water and Power • Water and Power are essential simultaneously
• The variation of energy consumption (kWh/m3) is function of the site (rural or urban), of seasons (summer or winter). In the GCC, the electrical consumption in the winter represents only 30 - 40 % / summer
• Moreover, water needs are higher than electricity needs: in the GCC the growth rate of water consumption is 11 % per year and energy is only 4 % (*)
(*) Koussai Quteishat, Hydrorop 2001, Marseille
87
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Seasonal variation of water and electricity needs
in ABU DHABI
88
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Seasonal mismatch between water & power
generation capacities
MW
or
m3
Recoverable Energy
Cost of the water/power mismatch for Abu Dhabi: US$11.2 m/y
Jan Feb Mar Apr May Jun July Sep Oct Nov Dec
Power demand
from the network
Capacity of the power plant
Water demand
Source: SUEZ 89
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Advantages of thermal process in ME
Suitability in Dual process (power/water) plants
Gulf water has high salinity. Peculiarity of seawater, polluted sites, foulants (very simple pretreatment)
Availability of very low energy cost (waste energy). MED becomes more viable than RO
More reliable and mature (MSF)
Produces pure water TDS < 25mg/L
Large scale size units
Integrates water and power demands
90
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Hybrid Systems
2 + different desalination processes are coupled with the power plant
Mainly MSF or MED with RO or VC. This combination can better utilize fuel energy as well as the power produced
For utilization of idle power to produce water via RO or MVC, the extra produced water can be stored in aquifers
RO
FUEL
EAU DE
MER
Vapor Turbine
Brine
EAU DOUCE
Product
MSF / MED
91
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
A common intake, reduce pumping energy
Blending products of RO and distillation plants
Use of single stage RO thus lowers energy needs
RO membrane life can be extended
Feed water temperature to RO can be integrated and optimized with distillation and power
plant
Integrated pretreatment and post treatment can reduce energy and chemical consumption
Possibility to increase the ratio water/electricity if the water consumption is preponderate
Advantages & potential of hybrid systems
92
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Fujairah Plant - UAE • Seawater 40 g/l – T = 22 - 35 °C – Started in 2002
• Separate intake for MSF and RO
• Feed water for RO not heated by MSF
• 4 gas turbines of 109 MW + 3 generators of 380 t/h – 68 bar – 537 °C
generates 500 MWe net on the network + 662 MW for desalination
MSF 5x12,5 MIGD = 62,5 MIGD, 5 x 56.250 m3/j = 281.250 m3/j
RO 15 x 2,5 MIGD = 37,5 MIGD, 15 x 11.250 m3/j =168.750 m3/j
TOTAL 100,0 MIGD soit 450.000 m3/j
MSF : Ratio = 8 TBT (Top Brine Temperature) = 107 - 109 °C
93
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MULTISTAGE FLASH TECHNOLOGY (MSF)
Process description
Process thermodynamics
Stage simulation model
94
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MSF what do we know ?
• Highly reliable operation
• Scalable up to very large sizes 18MIGD
• Readily coupled with steam turbine generating stations in
“dual purpose plant” configuration
• Good water to power to power ratio
A big and well-deserved success since the 1960s
95
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
• It had long been known that water could be heated above its normal
boiling point in a pressurized system
• If the pressure was released, a portion of the water would boil off or
“flash”. The remaining liquid water would be cooled as the issuing
vapor took with it its heat of vaporization
• Since evaporation occurred from the bulk fluid rather than at a hot heat
exchange surface, opportunities for scaling would be reduced
Process description:
How did it begin?
96
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
What flashing looks like
• Hot brine from the previous stage
enters through slot at lower
temperature and pressure stage
• It senses the new lower pressure
environment, and
• Flashes!
97
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Flashing and boiling: the
thermodynamic meaning
T
Entropy
S
Isobar 1
Isobar 2
1
2
98
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MSF development
• Cross tube design - tube length limitations
• Long tube design
• Once through process
• Optimise structural design to reduce shell plate thickness and
weight
• Solid stainless steel shell construction
• Thinner heat transfer tubes
99
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Typical stage arrangement of a large MSF plant
Vapour
Condenser
Tubes
Flash evaporation
Distillate out
Brine out Brine in
Demister Demister
MSF Desalination Plant
Vent
1
2
100
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Stage modeling thermodynamic ideal case :
T
Entropy
S
Isobar 1
Isobar 2
1
2
2a 2b
flashing
condensation Isobar 3
101
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
The influence of minor constituents of
seawater and brackish waters A. Dissolved inorganic
– If seawater consisted of only H2O and NaCl, life would be simple
– But natural waters are often close to saturation in many
inorganic compounds (CaSO4, Mg(OH)2, Ca(HCO3)2, etc.)
– What is worse, their solubility may be inverse functions of
temperature
This involves the following aspects to be considered:
– scaling
– venting
102
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Stage modeling thermodynamic real case :
103
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Multi stage flash
104
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Single stage temperature diagram
Flashing
Brine Flow
Recirculated
brine flow
= Inlet temperature difference
= Outlet temperature difference
= Log mean temperature difference (LMTD)
- Vapour to brine in
- Vapour to brine out
= Log
To
Driving
Temp.
Diff. Vapour
Flow
- Flash Temperature Drop
- Thermal Losses
= Log Mean Temperature Difference
t f
t e
Vapour
Temp
t l
t 2 t 1
t t 2
Tube inlet
m t
t 2
t m
t l
t 2
t m
/ 1
MSF Desalination Plant
( )
105
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
To Driving
Temp
Diff
Brine
Heater
Bottom Brine
Temperature - T min
Top Brine Temperature - T max.
Product out
Seawater in
Flashing Brine Flow
Recirculated
Brine Flow
Heat Recovery Stages Heat Rejection
Stages To = Driving Temperature Difference
(Practically constant through heat recovery stages)
Stage temperature diagram
Complete plant (brine recirculation type)
MSF Desalination Plant
106
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MSF Desalination Plant :
MSF what process ? 107
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MSF Desalination Plant
MSF what process ? 108
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Flow sheets: cross flow brine recirculation
109
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Flow sheets: once through
110
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Heat reject stages
Seawater
out
Seawater in
Ejector
Deaerator
Heat recovery
stages
Brine
recirculation
pump
Product
out
Brine blowdown
Condensate
return
Desuperheat
Brine
heater
Steam
supply
Ejector steam
Seawater
inlet
header
Seawater
outlet
header
To
product water
treatment
303 ton / h 21,000 ton /h
14,300 ton /h
2350 ton /h
Main flow stream mass balance
111
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
112
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MSF cross flow plant internal layout:
How it really looks like low side flash chamber
113
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MSF cross flow plant internal layout:
how it really looks like upper side
114
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Distillate
tray
Inter-stage
wall
Demister
support
MSF cross flow plant internal layout
115
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Multiple Effect Desalination Technology
MED
- process description
- process thermodynamics
- stage simulation model
116
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Evaporation Concept
MED
Vapour Condensing Brine Heating
Falling Film Vapour Condensing
Potential for Scaling Sponge ball
cleaning
MSF
117
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
MED distillation
• Horizontal or vertical tube
• Falling film of seawater - high heat transfer coefficients
• Mostly horizontal tube, low temperature
• 1st effect 650 - 670 max temperature
• Performance ratio up to 9:1 with no TVC
• Up to 15:1 with TVC - thermal vapour compression and high steam
pressure
• Steam isolation needed in dual purpose plants
• Lower power consumption than MSF and RO
118
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
• Unit size has increased from 1 to 5 MIGD (now 8
MIGD) in 8 years
• Potential for further increase?
• Improvements in thermal vapour compressors and plant
configuration
• Reduce steam supply pressure
• Trade off between steam consumption and supply
pressure
• Distiller performance v power plant output
MED distillation
119
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Typical parameters for large MED plant are:
Top Temperature of first stage 65 deg C
Performance Ratio 8 to 15
Distillate Output (*) 3.5-5 MIGD
MED distillation
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MED Desalination Plant
Typical Stage Arrangement of a Large MSF Plant
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• If reduced pressure causes evaporation at a lower
temperature, then compression should force
condensation at a higher temperature
• The combination of these phenomena can yield useful
(and efficient) desalination process
The concept of thermo compression
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ΔT pitch
The concept of thermo compression
Isobar 1
Isobar 2
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Mechanical Vapor Compression
(MVC)
124
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• Especially in their early development the mechanical
compressors were unreliable
• They were replaced by a thermally-driven no-moving-
parts substitute
Mechanical Vapor Compression
(MVC)
125
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A Simple Ejector-Compressor
Fluid flowing in the pipeline (the "motive fluid") speeds up to pass through the restriction and in accordance with Bernoulli's equation creates vacuum in the restriction. A side port at the restriction allows the vacuum to draw a second fluid (the "ejected") into the motive fluid through the port. Turbulence downstream of the port entrains and mixes the ejected into the motive fluid.
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Process description
127
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Flow sheets : once through
128
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Flow sheets : vapor compression
129
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130
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MED process phenomena :
thermodynamic path : the ideal case
131
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MED process phenomena :
thermodynamic path : the ideal case
Evaporation
132
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Large wetting ensures
complete wetting of tubes.
Complete wetting is a prime
contributor to avoid scale build-
up on heat transfer tubes.
MED the importance of the wetting rate
The feed can be sprayed in parallel over all effects wetting rate = 100 l/m/hr
The feed can be sprayed over the first effects and then with brine recirculation over the
remaining = 400 l/m/hr
Spray nozzles
133
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MED: Wetting Rate
All heat transfer surface must contribute
to the brine boiling
Scale
tube
Danger of tube scale
bridging
134
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MED cross flow plant internal layout
135
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MED cross flow plant internal layout
Vapor box
previous effect
Condensate
vapor
(distillate)
Seawater spray
Released vapor
Demisters
Brine pool
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MED arrangements
137
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TCD 5 36368
GENERAL ARRANGEMENT
CELL 2C Desalination Projects :
MED layout
138
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Seawater abstraction
139
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Sub-surface Surface
Offshore
Jetty
Near-shore
Channel
Beachwell Infilt Gallery
Vertical
Horizontal
Passive
Mechanical Lagoon
Intake Design Options
140
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• Groundwater Wells
141
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• Groundwater Wells
The adoption of wells is generally restricted to those conditions
where raw water demand is low (less than 2000 m3/hr).
Normally the use of well fields to supply seawater feed to RO plants
offers several benefits
These include a natural filtration system that removes several
potentially damaging materials such as heavy oils and debris and offers
a better feed water quality to the RO plant.
In general well fields offer lower construction and maintenance costs
with respect to other seawater intake structures.
Soil permeability is critical for the design of a beach well.
Testing permeability is essential
142
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Open seawater Intake Configurations
143
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Open Seawater Intake
courtesy USFilter
144
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courtesy USFilter
Travelling Water (Band) Screen
Through-Flow Dual-Flow
145
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CONSULTING
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When circulating water pump is operated in the inappropriate intake sump, oscillation and noise appear which gives serious influences on the pump performances. Therefore, the intake sump should be ensured through the model test and computer analysis in case of uncertain layout arrangement.
The form of eddy
Hollow eddy Intermittent eddy
Consecutive eddy
Underwater eddy
Model Test - Intermittent eddy
Analysis - Flow velocity distribution just near the pump (before remodeling)
Analysis - Flow velocity distribution just near the pump (after remodeling)
The Intake Model Test for
Circulating Water Pump
146
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High Specific Speed (Ns)
Pump Test Loop Suction Sump Model Test
Suction Sump Model
Test Loop
Typical test simulation to be carried out
147
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Hydraulic institute standards
• Dimensions are in proportional ration given seawater supply pump
bellmouth and intake dimensions.
D W
=2D
X> 5D
C=
0.3
-0.5
D
148
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Intake Arrangements
Break water
Dredged
Basin
A A
Section A-A
HHW
Slope Protection
Intake Screen Structure
Desalination Facility
Pumps
Traveling Screens
Trash Rack
Shoreline
Channel Intake Jetty Intake
149
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Hubert/vijay
In practise there are many hurdles
RO technology is extremely sensitive to :
Sea water quality and site location
Pollutants (oil, hydrocarbons) and bio-fouling
Microelements in seawater (i.e Boron) which presence is totally irrelevant for thermal technologies
RO technology so far has demonstrated limited operational tolerance
and deep understanding of engineering and water bio-chemistry aspects
In particular the critical components leading to operational problems in
the past have been the pre-treatment
SWRO technology process features
150
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The SWRO Desalination Process
151
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152
Basics of RO Technology
RO technology relies on membranes permeable to water but not to dissolved salts
Hubert/vijay
30
Pressure is the driving force of the process. It has to be sufficiently high to overcome the osmotic pressure of the saline seawater . The higher the salts the higher the pressure which is necessary
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The membrane is a barrier between two phases that permits preferential and
selective crossing of one or more kind of fluid mixture from one phase to
the other.
The driving forces can be different such as :
-difference in pressure,
-difference in concentration,
-difference in chemical potential
-Others Typically industrial RO – UF processes are pressure driven.
A
P
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Transport Model in a Pressure Membrane
Two types of filtration Dead-end
Cross-flow Cross flow filtration is better
for high concentration,
because the tangential flux
close to the membrane
reduces polarization
phenomenon
The negative aspects of polarization can be reduced using appropriate flux configuration
Particles that can’t permeate through the
membrane, tends to accumulate close to
membrane surface
Decrease membrane performance
Reversible process
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MEMBRANE FEATURES Parameter that characterized
membrane performance
Driving force
Membran
e
Rejected
kind
Permeated
species
Scheme of membrane
separation
Flux rate (L m-2h-1)
depends on: driving force
velocity of recirculation
temperature
feed concentration
Rejection of components
%][
%][P%][100%R
Feed
ermeateFeed
membrane process are dynamic and not equilibrium
1)
2)
Permeate flux per unit of membrane
surface
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50
55
60
65
70
75
80
85
90
95
100
6 7 8 9 10 11 12
2nd feed water pH
2n
d f
eed
wate
r B
oro
n r
eje
cti
on
Boron rejection
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Exercise: Flux calculation
Membrane flux: Product output
(n° membrane x membrane’s surface)
mm S
p
nFlux
m
Product output = mp
Number of membrane = nm
membrane’s surface) = Sm
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MV (see fomsheet E6) un. 20-lug 14-ott 26-ott %
Reverse osmosis Summer
Gross Product water Output 1st pass m3/h 10.832 10.770 -1%
Nb of RO trains on duty un. 16 16,0 15,0 -6%
Nbof trains in stand by un. 0
Product water Output per train of 1st pass m3/h 677 677,0 718,0 6%
1st pass membranes per train un. 1274 1.274 1.379 8%
1st pass membranes TM820-
369
TM820-370 TM820-370
Membranes' surface m2 34,374 34,374 34,374
Membrane flux MV l/h/m2 15,46 15,46 15,15 -2%
Reverse osmosis Winter
Gross Product water Output 1st pass (uncahnged) m3/h 10.832 10.832 10.770 -1%
Nb of RO trains on duty un. 16 15,0 14,0 -7%
Nb of RO trains on stand by 0 1,0 1,0
Product water Output per train of 1st pass (calculated) m3/h 677 722,1 769,3 7%
1st pass membranes per train un. 1274 1.274 1.379 8%
1st pass membranes model TM820-
369
TM820-370 TM820-370
Membranes' surface m2 34,374 34,374 34,374
Membrane flux MV l/h/m2 15,46 16,49 16,23 -2%
OD (see fomsheet E6) un. f 14-ott 26-ott %
Reverse osmosis
Product water Output per train of 1st pass m3/h 486,0 486,0 0%
1st pass membranes per train un. 1.078 1.078 0%
1st pass membranes SR-HR380 SR-HR380
Membranes' surface m2 35,300 35,300
Membrane flux OD l/h/m2 12,77 12,77 0%
Flux calculation
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159
In an industrial plant the principles of RO are implemented in the basic flow sheet as below
Seawater intake and initial filtration
Pre-treatment
High pressure pumps
RO membranes
Conventional
Membrane (Ultra filtration micro filtration)
Main plant components are :
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CONSULTING
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WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
160
In practise there are many hurdles
RO technology is extremely sensitive to :
Sea water quality and site location
Pollutants (oil, hydrocarbons) and bio-fouling
Microelements in seawater (i.e Boron) which presence is totally irrelevant for thermal technologies
RO technology so far has demonstrated limited operational tolerance and deep
understanding of engineering and water bio-chemistry aspects
In particular the critical components leading to operational problems in the past have
been the pre-treatment
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Traditional feed pre-treatments:
•Mechanical treatments (media filters, cartridge filters)
•Extensive chemical treatments for fouling, bio-fouling
and scaling prevention (FeCl3, NaHSO4, H2SO4)
•Additives for prevention of corrosion and membrane
preservation
161
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Various possible schemes
From Sea Intake
Bar Screen
Travelling Screen
Settling Dual Media Filter
Primary Treated
Water Basin
Pump
Cartridge Filter
5.0 micron
To RO HP Pumps
Dirty wash water
Option 1
Pre - treatment
Full Scale Plant
Sea Intake
Sand/grit
settling tank
Floatation
Units
Roughing Filters
Polishing Filters To RO Stage
Bar Screen
Band Screen
Pump
Clarified Water
Storage
162
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Sea Intake Break Tank
Sand/grit settling tank
Storage 1.2 m3
DAF Units
Dual Media Filters
Dual Media Filters
Storage 1.0 m3
Pump
To RO Stage
Mass Balance Diagram - Pilot Plant
Conventional Pre-treatment
Sludge to waste
Recycle
Washwater to waste
Washwater to waste
50 m3/h 50 m3/h
Sand/grit to waste
Alum
Coagulant 2
H2SO4
163
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Mass Balance Diagram - Full Scale Pre-treatment
From Seawater Intake Intake chamber
Band screens
Bar screen
Pump Station
Actiflow Clarifiers
Dual Media Filters
Filtered Water Tank
Pump
Pump
TO RO Stage
Recycle
Pump
Pump
Backwash Pump
Dirty Washwater Tank
H2SO4
27811 m3/h
1223 m3/h
27114 m3/h
871 m3/h
Filter Rinse Water 1223 m3/h
(average)
164
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Full Scale Flow Diagram Pre-treatment
From Sea Intake
Bar Screen 30 mm
Travelling Screens 1.0 mm
1800 mm pipes
Trash compactor
Pump Station
Intake Sump
Debris Filters 200 micron
1600 mm pipes
UF Membranes
Storage Tank 5,000 m3
To RO Stage 21,00 m3/h
Wash water
NaOCl
Acid
Base
H2O2
165
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Conventional pre-treatment chemicals
• Primary coagulant dosage of ferric chloride (15-21 L/1000m3
FeCl2 40%) for surface charge neutralization
• Chlorination (11-22 L/1000m3 Sodium Hypochlorite, 6.5%)
for controlling biological growth
• Sodium bisulphite (38%, 0.18-1.8 L/1000m3) added to remove
residual chlorine
166
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
In 1995 it was estimated that less than 25
MGD installed capacity was in operation in
North America; five years later that number
has grown to over 400 MGD.
About seven different MF/UF manufacturers
are based in the USA, Japan, France, the
Netherlands and Canada. MF and UF
systems in the 2 to 4 MGD capacity range
are priced at about $0.45 per gallon of
capacity; MF/UF systems capable of 25 to
40 MGD are priced at about $0.25 per gallon
of capacity.
MF/UF Pre-treatment
167
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Clear
wellIntake
Traveling
screen
Primary
multimedia
filters, 13 X
32m2
Secondary
multimedia
filters, 9 X
33.6m2
Cartridge
filters, 20
Filter
backwash
discharge lines
Sludge
concentratorStorage
tank
Filter
press
Backwash
storage
tank
Cl2
FeCl3
Scale
inhibitor
SBSTo
RO
Configuration of two stage media filtration system in seawater RO plant 168
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Wash water
troughs
Influent &
backwash water
channel
Underdrain blocks & media
retaining plate
Backwash supply &
filter effluent
Dual filter media
Air backwash
Header
Surface wash, not
shown
Dual media, gravity filter configuration (Courtesy of Infilco-Degremont) 169
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170
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Dual media, horizontal pressure filter configuration (Courtesy of Tonka Equipment Company) 171
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
FeCl3
CaCO3
CO2
Cl2
NaHSO3
Configuration of RO seawater system with membrane (UF/MF) pretreatment
172
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Cross section of
capillary fiber Membrane module
250 m2, 100 m3/d
(2700 ft2, 26,000 gpd)
1.4
m (4
.6 ft)
Filtrate
flow
directio
n
Capillary lumen
Figure 62. Submersible capillary technology 173
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
174
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Design concept of submersible system (Courtesy Zenon Corporation) 175
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
CEB1 CEB2 CEB3
Air blower
Vacuum pump
Backwash
pump
Filtrate
pump
CIP1 CIP2
Strainer 100 m
Filtrate
storage &
backwash
tank
Cleaning chemicals Backwash chemicals
Flow diagram of submersible capillary membrane plant
176
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Potting
Resin
Feed
Filtrate Core
Tube
Filtrate
Concentrate
End Cap
Configuration of pressure driven UF/MF membrane module.
177
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
HYDRAcap 40: 320 ft2 (30 m2)
HYDRAcap 60: 500 ft2 (46 m2)
Figure 67. Pressure driven capillary UF module
178
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Flow diagram of pressure driven capillary membrane unit
179
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
180
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Forward osmosis
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Bringing new
technology to
the water
industry
182
Forward Osmosis
∆π
∆π
Source Water
(Seawater or
Brackish
Water)
Osmotic
Agent
(High Osmotic
Pressure) P1
P2
P2-P1 > ∆π
Reverse Osmosis
(RO)Forward Osmosis
(FO)
• FO can dilute a solution of higher osmotic pressure using a solution of lower osmotic pressure
• FO can concentrate a solution of lower osmotic pressure using another of higher osmotic pressure
Applications:
• Emergency drinks from brackish or sea water
• Power generation (MW)
• Enhanced oil recovery (MW)
• Fracture water (MW)
• Thermal desalination feedwater softening (MW)
• Desalination (MW)
• Water substitution (MW)
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Bringing new
technology to
the water
industry
183
Forward Osmosis Desalination
Benefits: • Proven low rate of fouling of FO membranes
• Proven low rate of fouling of regeneration RO
membranes
• Lower fouling propensity delivers energy
consumption reduction of up to 30% relative to
reverse osmosis – site dependent
• Lower salt passage relative to conventional reverse
osmosis
• Inherently low product boron levels, when compared
to conventional reverse osmosis
• Higher availability than conventional reverse osmosis
plant due to low fouling and simple cleaning when
required
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Investment cost - RO process
0
500
1000
1500
2000
2500
1000 10000 100000 1000000
Seawater
Brackish water
Capacity m3/d
Inv
es
tme
nt
$ p
er
m3/d
184
CONSULTING
ENGINEERS
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Desalination cost UDATED 2005 $US/m3)
Seawater
• Very large scale plants 0,50 - 0,80
• Large scale plants 1,00 - 1,50
• Small plants 2,00 - 3,00
Brackish water
• Large scale plants 0,20 - 0,40
• Small plants 0,50 - 0,70
185
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Recent prices - seawater – RO (*)
Site Capacity Start Cost
m3/d production $/m3
EILAT (Israël) 20.000 1997 0,72
LARNACA (Chypre) 56.000 2001 0,83
TAMPA (Floride) 106.000 2003 0,56*
ASHKELON (Israël) 320.000 2004 0,54
(*) Mark Wilf – MEDRC – Cyprus – 6/ 8 December 2004
186
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Possible alternatives for different processes
- direct cycle recycling
- transversal tubes longitudinal tubes
MSF - Tmax or TBT : 90 °C 110 °C
- ratio or GOR : 7 10
- material : Cu-Ni titanium
- Forward cycle Backward cycle
- horizontal tubes - wet plate evaporators
MED - Tmax or TBT : 55 °C 120 °C
- MED with or without vapor compression
- ratio or GOR : 4 12
- spiral wound hollow fiber
- 1 pass 2 pass
RO - with or without energy recovery
- energy recovery : Pelton T pressure exchanger, DWEER
- conventional pretreatment membranes MF / UF / NF
- electro-pomp HP with or without speed variation
187
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Investment cost of different processes
Process $/m3/day
MSF 1.200 – 2.500
Seawater MED 1.000 – 2.000
VC 1.000 – 1.600
RO 800 – 2.000
Brackish water RO 200 – 500
ED 300 - 400
188
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
SUSTAINABILITY ISSUES RELATED TO
DESALINATION
189
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Energy recovery devices for SWRO
applications
190
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
ENERGY RECOVERY SYSTEM -
ENERGY
RECOVERY SYSTEM
ISOBARIC SYSTEM
DWEER ERI AQUALYNG
RECUPERATOR
CENTRIFUGAL / ROTARY SYSTEM
PELTON WHEEL TURBO
CHARGER FRANCIS TURBINE
EFFICIENCY WILL BE >95%
MIXING WILL BE 3 TO 6%
MORE CAPEX
MAX. EFFICIENCY
82 – 70%
NOT CONSIDERED
LOW CAPEX
MAX. EFFICIENCY
89%. SYSTEM
EFFICIENCY – 78%
MORE THAN
PELTON WHEEL
MAX. EFFICIENCY
85%. SYSTEM
EFFICIENCY – 70%
LESS CAPEX.
191
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
192
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
193
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Page 194
Major Sustainability issues related to desalination
plants:
1)High energy footprint per unit of product
water
2)Impact of process flow discharge:
blowdown brine salinity and seawater heat
rejected temperature
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Mixing
Desalinatio
n
Salt Sweet
water
Energy =
4.3 kJ/kg~
1.2
kwh/m3
Energy =
?
Brine Sweet
water
Energy footprint per unit of product water
195
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
• Studies have been carried out showing that potable water
with TDS lower than 500 mg/l could be obtained with SWRO
technology with less than 2.5 kwh/m3.
• Minimum bottom threshold (theoretical) for power
requirements for SWRO is depending on TDS ranging
between 1.2-1.5 kwh/m3
1.Energy consumption of status of art desalination
projects
196
energy footprint per unit of product water
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CONSULTING
ENGINEERS
WATER ARABIA 2013 : Dr. CORRADO SOMMARIVA 4th February 2013
Grid Emission Factor
• In parts of the world that are heavily reliant on coal the
grid emission factor is somewhere near 0.8TCO2/MWH.
• Whereas where there is lots of new and efficient system
the grid it tends to be lower e.g 0.5TCO2/MWH
2. in terms of CO2 related emissions
197
Energy footprint per unit of product water
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2. in terms of CO2 related emissions
20
10
19.6
11.2
17
3.2 3.62.8
10
2
4
6
8
10
12
14
16
18
20
MSF
cogeneration
MED TVC
cogeneration
MED
cogeneration
SWRO membrane
distillation
kg
CO
2/m
3o
f p
rod
ctw
ate
rp
rod
uce
d
MED
condensing
SWRO
(not Gulf)
Energy footprint per unit of product water
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Seawater impact
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)( Dv
D HH
DP
PD = power dissipated in the sea
D = Distillate produced
= plant efficiency
H = enthalpy ( v refer to steam D refer to distillate
Operating Efficiencies
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Seawater impact
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Operating Efficiencies
At a given discharge enthalpy and production
plant efficiency sharply decrease the heat
dissipated to the sea
At high efficiency the difference between the heat
dissipation with increasing plant size decrease
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What are the results in a comparison ?
Environmental impacts in power generation and desalination processes
Reference
process
Type of process Energy dissipated in
the environment MW
TDS increase with
respect to the uptake
Conventional
cycle
50 0Power
generation
100 MW
Combined cycle 10 0
MSF
(performance
ratio 9)
120 15-20 %
MED
(performance
ratio 9)
100 15-20 %
Desalination
plant
7.2 MIGD
SWRO 0 50-80 %
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Differential temperature across thermal
desalination plants are quite high
10 º C to (extreme of ) 14 º C
in summer compared to max 5 in power plants
Winter operation the T is even more severe 17 º
C to (extreme of ) 20 ºC
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Differential temperature comparison between power and desalination processes
Reference
process
Type of process
Differential temperature across
the process [C]
Power generation
150 MW
Conventional cycle
3-5
Combined cycle
5
Desalination
plant
7.2 MIGD
MSF (performance ratio
9)
Summer
Winter
8-12
Up to 18
MED (performance ratio
9)
10
SWRO
0-1
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MATCHING WATER AND POWER
GENERATION ; AVOIDING
INEFFICIENCIES
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Despite all thermal
desalination plant are
installed as cogeneration
the winter summer
unbalance of water and
power demand generate
tremendous inefficiencies
The energy situation
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What can we do to avoid this inefficiency ?
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IMPROVING EFFICIENCY AT
PLANNING STAGE
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industrial
10%
agricultural
66%
domestic
24%
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SHAWER / BATH
HAND BASIN
TOILET
KITCHEN SINK
LAUNDRY
GREY
WATER
TREATMENT
GARDEN
BLACK
WATER
TREATMENT
POTABLE
WATER
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End of the course
• Thanks
• Dr. Corrado Sommariva
Dr. Corrado Sommariva
ILF Consulting Engineers Abu Dhabi
Managing Director Generation Middle East
Al Ferdous Tower Salam Street 4th Fl.
P.O. Box 73250
Abu Dhabi, United Arab Emirates
Phone: +971 2 6716500
Fax: +971 2 6716166
Mobile: +971 50 4438997 (United Arab Emirates)
Email: [email protected]
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