Systeem Thinking, Systeem Integration ‘Multi Source Multi … · 2016-03-10 · Exergy • Coal...
Transcript of Systeem Thinking, Systeem Integration ‘Multi Source Multi … · 2016-03-10 · Exergy • Coal...
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Systeem Thinking, Systeem Integration
‘Multi Source Multi Product’Systems.Kas Hemmes
KNAW-VCE lezing 7 november 2006, Amsterdam
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Sustainable developmentBrundtland
• . . development that meets the needs of the present without compromising the ability of future generations to meet their own needs.
• . . . sustainable development is not a fixed state of harmony, but rather a process of change in which the exploitation of resources, the direction of investments, the orientation of technological development, and institutionalchange are made consistent with future as wellas present needs.
• Energy is only part of the problem.
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System Thinking (Amory Lovins)Systems Thinking: Optimizing Not Just Parts, But Entire Systems
• Designers and decision-makers too often define problems narrowly, without identifying their causes or connections. This merely shifts ormultiplies problems.
• Systems thinking —the opposite of that dis-integrated approach—typically reveals lasting, elegantly frugal solutions with multiple benefits, which enable us to transcend ideological battles and unite all parties around shared goals.
• … systems thinking also reveals interconnections between problems, which often permits one solution to be leveraged to create many more.
• Its about a different way of thinking!! • That is the goal of this lecture• The (energy) examples are just an illustration
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What is Systems Integration?1. Integration of components into systems2. Integration of different energy sources
(multi source multi product systems)3. Integration of new and existing
technologies4. Integration of sectors5. Integration of functions
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1. Integration of components to form anenergy system
Y DT C T
system boundary
Φi,in(x,t) Φj,out(x,t)C
S
Φloss(x,t)
Y = Yield; supplyT = TransportC = ConversionS = StorageD = Demand
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Mismatch in place and time
Y DT C TS
Yield & Demand
Y(x,t) D(x,t)
Solution: transport and storage
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But…
Systems thinking!
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1
Classification of energy system
2
3
Linear energy system
Co-generation system
Tri-generation system
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Niet really integrated, but linked linear energysystem
Renewable
1
2
3
Fossile
Nuclear
E-net
Compare to communicating vats!!1 Joule wind/solar saves 2,5 Joules of fossil fuels
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Consequent integration: co-firing / mix
Biomass Co-firing
F
RE-net
Bio-ethanolBio-diesel
mix
F
RTransport
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Example : simple CHP MSMP
CHP
Pe
Pg
Ph
Le = 700 kW
MSMP system
electricity
natural gas
district heatLh = 700 kW
c
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P�
P�
P�
L�
L�
energy hubMSMP
inputsL�
outputs
Multisource-multiproduct systemen (MSMP)
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Use degrees of freedom to optimise
• How much of which input is needed to optimallymeet demand?
• Welke limiting conditions?• Which optimalisation criteria??
• Economical optimalisation ≠ Energy optimalisation
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A Fuel Cell that produces hydrogen and converts heat
into power ?
CO + H2O ==> H2 + CO2
DCFC
C
Q (solar)
Power
Syngas
C+½O2 = CO
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Electrochemical gasification in a Direct Carbon Fuel Cell
2C + O2 ==> 2CO ΔS > 0ΔH < 0
η fc
T SH
= − >1 100%ΔΔ
DCFC
C
Q
Power
• (Solar) Heat can be converted into power with an efficiency higher than the Carnot efficiency!
• Self regulating process
Syngas
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Exergy
• Coal and biomass are increasingly important!!
• Use the complete exergy of solid fuels
• Plane gasification of coals and biomass is a waste of exergy
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JFC:March 03
Direct Carbon Conversion (DCC): electric power from electrochemical reaction of C and O2
_ +
Carbon in
Electric power out
CO2 out
Air in
Air outReactive, nano-scale disorder C from thermal decomposition of CHx
Net reaction:C+O2 = CO2
• Total efficiency ~ 80% of ΔHstd • Pure CO2 product for reuse/sequestration• Use highly reactive carbons from CHx pyrolysis• Inherent simplicity
• Total efficiency ~ 80% of ΔHstd • Pure CO2 product for reuse/sequestration• Use highly reactive carbons from CHx pyrolysis• Inherent simplicity
Concept
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JFC:March 03
Evaluate processes for fossil conversion to electric power at efficiencies > 70 %
• Coal, lignite• Natural gas• Petroleum• Petr. coke• Biomass
H-pyrolysisor
pyrolysisC & H2
Electrochemicalconversion
AirElectric power
Sequester or reuseCO2
ΔFuel cells, turbines, refinery, etc.
H2
C
• The pyrolysis of CHx => C + (x/2)H2 consumes 3-8% of fuel value; no ash
Target: 70 – 80 % efficiency
Objectives
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Integration of solar & fossil in a MSMP system
Thermal decomposition
Fossil (CxHy)
Solar(or Nuclear)
CH2
Apply in Northern Africa/ Algeria??
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Thermodynamic advantages of direct electrochemical carbon conversion
Table 3 Order of magnitude comparison between the electrochemical conversion efficiencies of C, H2 and CH4 at 700 oC (Cooper, J. F. et al 2000)
Fuel ηfc ηNernst loss ηirr ηtot
C 1.0 1.0 0.8 0.8
H2 0.7 0.8 0.8 0.45
CH4 0.89 0.8 0.8 0.57
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Countries with large potential for Solar and Biomass can become the energy
producing countries of the future.
Fuel cell technology
Solar Biomass
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Conventional Solution for dealing with fluctuatingrenewable energy sources essentially is a complex
storage device in a linear energy system.
E - power
E - power
Storage
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Storage has become a problem rather than a solution
Electrolyser
E - power
heat
H2
FCO2
H2O H2O
E - power
Storage
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Conventional Solution is ‘IslandThinking’ not ‘System Thinking’
Storage
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MSMP voorbeeld: integration of an internalreforming fuelcel with wind energy
IR-FC
air
N2NG Optional (NG/N2 )
H2
E - power
H2
heat
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MSMP
IR-FC
NG
E - power
CO / H2
heat
E - power
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Co-productie• Co-productie of hydrogen and electricity in an
internal reforming fuelcel• The fuelcel can operate with 95% natural gas
(standard) and 60% (hydrogen and carbonmonoxide co-production)
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MCFC Hot Module
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Internal Reforming - SOFC system flowsheet
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Mode 1 – High efficiency mode• Input flow rate of NG is kept constant at 2000 kW. • The fuel utilization is decreased by decreasing the current density.
0
500
1000
1500
2000
2500
3000
3500
4000
60 65 70 75 80 85 90 95
Fuel Utilization (%)K
W
KW-inputCO-KWH2-KWPower-KW
00.10.20.30.40.50.60.70.80.9
1
60 65 70 75 80 85 90 95
Fuel Utilization (%)
Effic
ienc
y (%
)
Electric-EfficiencyGas EfficiencyTotal Efficiency
3 outputs vs Fuel Utilization•Electric Power•H2 & CO•(Waste) heat
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Mode 1 – High efficiency mode
00.10.20.30.40.50.60.70.80.9
1
60 65 70 75 80 85 90 95
Fuel Utilization (%)
Effic
ienc
y (%
)
Electric-EfficiencyGas EfficiencyTotal Efficiency
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Analysis ‘Gasfired Windenergy’ (1)
OCV = Open Cell Voltageα = 100 – 220 mVuf = fuel utilisationi = current densityr = specific resistance
1 . .2cell fV OCV u i rα≈ − −
• Use the specific charactersitics of a component (fuel cel)
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Analyse ‘Gasgestookte Windenergie’ (2)
• No hydrogen storage • Use naturally present storage of natural gas• Offshore gas and wind available(North sea).• What’s the problem and for who?• Large scale implementation of windenergy or
fines on promised kWh targets that aren’t met?
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3. Integration of new technologies in existing technologies
• Developing new technologies takes time• Existing technologies are not always very efficient• Exisiting technologies are not always written off already.• Needs to be implemted in existing knowledge structure.
Examples :3.1 Fuelcels in a natural gas mixing plant3.2 MCFC or DCFC throught the concentration of CO2 from
off-gas of a coal power plant (BP)3.3. Fuelcel top-cycle in existing plants(N. Lior)
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Example 3.1: Fuelcels in a natural gas mixing plant
IR-FC FCAir -SEP
heat
air
N2
O2
NGNG/N2 /(H2 )
H2
E - power
H2
Low T heat
E - power
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Replacing airdivider in a mixing station by a fuelcel
The system produces electricity instead of using it!! (Order of magnitude of tens of MW)
IR-FC Low-T FC
air
N2NG NG/N2/(H2)H2
E - power
N2
Low T heat
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voorbeeld 3.2: MCFC or DCFC throught the concentration of CO2 from off-gas of a coal power
plant (BP)
NG
E - power
MCFC
The CO2 system produces electricity instead of using it (about 10 -100 MW)
N2/O2/CO2 N2/O2/CO2
H2O/CO2cathode: l/2 O2 + CO2 + 2e- = CO3
2-
anode: H2 + CO3
2- = H2O + CO2 + 2e-
CO32-
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voorbeeld 3.3: Fuelcel top-cycle in existing plants(N. Lior)
NG
E - power
SOFC / MCFC
HeatNG
air
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If you can’t beat them; join them!
Fuel Cell Carnot EnginesΔΗ=1 1-ηfc
Waste heat
Heat
ηfc ηc(1-ηfc)
00
0
1 1 0.94sG
TSTH T
ηΔ =
Δ= − = − ≈
Δ
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Example 3.3: Exergy losses combined cycle vs
Brandstofcel top-cycle (N. Woudstra)
Ex,fuel = 100 %
Ex,to GT cycle
PFC = 71.70 %
Pel = 80.77 %
Ex,to combustor
Fuel Cell Ex,loss = 5.59 %
2.90 %
HR Fuel Cell Ex,loss = 1.52 %
combustor Ex,loss
GT cycle Ex,loss = 1.66 %
stack Ex,loss = 6.42%
generator Ex,loss = 0.19 %
Grassmann diagram SOFC-GT(optimal system)
Ex,to HR = 7.37 %
HR Ex,loss = 0.95 %
PGT = 9.07 %
21.19
18.29%
Grassmann diagram combined cycle(triple pressure HRSG)
to GT cycleEx = 491 MW
fuelEx = 691 MW
combustion Ex = 200 MWloss
GT cycle Ex = 40 MWloss
P = 253 MWGT
Ex = 196 MWto HRSG
stack Ex = 17 MWloss
HRSG Ex = 19 MWlossEx = 160 MWto SC
steam cycle Ex = 20 MWloss
P = 135 MWSTP = 379 MWe
condenser Ex = 5 MWloss
generator Ex = 9 MWloss
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4. Integration of sectors
• Expand system boundaries• Solve multiple problems in one go
Voorbeelden:4.1 combustion of waste4.2 combi-boiler (warm tap water + heating rooms)4.3. V2G (vehicle to grid)
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Voorbeeld 4.3: V2G (vehicle to grid)
• NL: 6.000.000 cars à50 kW = 300 GW.
• This is more than 10 x the available power
• Only 10% of the cars are needed
• or … ??
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..or… al cars at 10%of the maximum power
• A fuel cell at 10% of the maximum power is very efficient
0
0.2
0.4
0.6
0.8
1
00.1
5 0.3 0.45 0.6 0.75 0.9
Current Density
Volt
Vcell
Pow er Density
p (W/cm
2)
0.25
0
0.05
0.1
0.15
0.2
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Nedstack fuel cell technology BV
NedStack PEM FC price developmentNedStack PEM FC price developmentRapid price reduction of PEM fuel cell stacks
Annual reduction with more than 50% !!!!Year everage sales price– 2000 € 45.000 /kW– 2002 € 10.000 /kW– 2004 € 2.000 /kW– 2005 € 1.000 /kW– 2006 € 500 /kW– 2007 € 250 /kW– 2008 € 125 /kW– 2010 € 45 /kW
1/1000 !!!!
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analysis V2G (vehicle to grid)
Two steps to think about:
1. The current system is inefficient (cars are just parked al day)
2. Transport and energy sectors are combined
And…• Overcapcity is used to approach the
thermodynamic limit• Batteries provide< 6. 106 kWh=6
GWh MW (1 hour of al power in the Netherlands)
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5. Integratie van functies
• industrial designers apply this all the time
Examples:5.1 solar panels instead of tiles on roofs5.2 wind energy in the built environment
There are many opportunities in this area
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Conclusion
Sustainable development demands• A broad scope, • Another way of thinking• Systems integration in different ways and at
different levels• Creativity, lateral thining, ‘2 photon
processes’.• And, to sum it up…
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“ A look at KNAW-VCE possibilities”
1. Can you link to Rein Willems’ energytransmition paths?2. Is it possible to say something about consequences of
multisource-multiproduct for out committee to selectideas?3. Is there a direct link between sustainability and integration
thinking? 4. Can we solve problems if we do not use sub-optimal parts
of systems or technologies? 5. Do sub optimal solutions not even ‘ buy time’, or do they?
PS: I’m curious to see your presentation!!!
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Can you link to Rein Willems’energytransmition paths?
• There is a growing demand for energy innovations. (OK)
• Its split up in 6 themes (too little attention for integration)
1. Sustainable resources2. Sustainable mobility3. System efficiency; (linear systems thinking)4. New gas, clean fossil fuels5. Sustainable electricity 6. Built environment
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Is it possible to say something about consequences of multisource-multiproduct
for our committee to select ideas?
1. The number options (e.g. MSMP) is large, but unknown. The committee should not only select, but also provide guidelines.
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Is there a direct link between sustainability and integration thinking?
There are similarities:
1. Broad system boundaries2. Solving multiple problems at the same time3. Goals are ambitious, abstract, far in the future, but
clear. (don’t define secondary goals too soon)
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Can we solve problems if we do not use sub-optimal parts of systems or technologies?
Yes, although improvements of subsystems will alwaysbe carried out
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Do sub optimal solutions not even ‘ buy time’, or do they?
Institutions
MarketsTechnology
1Operational Elements of an Energy System
Danger for lock-in: coal and biomassgasification!!