Flare Gas OVW
-
Upload
javiervalero -
Category
Documents
-
view
228 -
download
0
Transcript of Flare Gas OVW
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 1/12
Wh Measure Flare Gas ?
,
and chemical plants are primarily installed for safety
purpose.
• Flare gas measurement systems are primarily installed
for:
A) Leak
detection
B) Mass balance
C) Environment
D) National
legislation
E) CO2 emission control
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 2/12
Wh Measure Flare Gas ?
A) Leak detection:
• Detection of leakage from different processes into the main flare stack
.
• Monitoring of molecular weight for gas composition changes.
B) Mass balance:
• To measure the outlet to flare is important for the mass balance account.
• Detailed information of what has been extracted is essential for optimising
production.
C) Environment:
• The emission from flare stacks represent a source of pollution, both for CO2, soot, and dirt.
• Kyoto agreement
and
general
public
expectations
have
put
focus
on
the
impact o are gas emissions.
• Global restrictions and regulations on the pollution from the refineries, gas terminals and chemical plants.
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 3/12
Wh Measure Flare Gas ?
D) National legislation:
• ore an more coun r es are ocuse on yo o agreemen .
• Operators imposed to report their emission to national government.
• On NCS
the
amount
to
flare
was
reduced
with
30%
from
1989
to
1993.
The law and metering requirements was implemented in 1991
E) CO2 tax:
• In more and more countries oil companies and operators are imposed
to pay tax for their CO2 emissions.
• CO2 tax has increased the focus on flare gas measurements in these
countries, resulting in considerable reduced flaring.
• Accurate monitoring
important.
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 4/12
There are basically four types of flowmeters available for
Flare applications:
• Ultrasonic Gas
• Thermal Mass
• Optical mass
• Doppler
• Annubar
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 5/12
Preffered Technology for Flare Gas
Measurement‐ ‐
– Operation principle: An ultrasonic time‐of ‐flight flow meter uses
the difference
of
up
‐and
downstream
transit
times
that
the
flowing
gas
causes
– Features:
• Causes no pressure drop
• oes not o struct t e process ow
• No mechanical
moving
parts
• High turn‐down ratio
• e ‐ agnost c capa t es
• High temperature range
•Fast
response
time
• Goo repeata i ity.
• Sensors can be replaced during operation
• Not dependent on gas quality
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 6/12
Flare Ultrasonic Meter GF868 ‐ GE
Measurement Solutions
Features
• Measures velocity, volumetric and mass flow• New standard velocity range to 100 m/s (328 ft/s)
standard• New
extended
velocity
range
to
120
m/s
* • Measures instantaneous average molecular
weight• Measures hydrocarbon gases• Minimal maintenance due to no moving
parts, no holes or tubes, and tolerance to
dirty or
wet
conditions
• Delivers accurate flow rate, independent of gas composition
•
• Field‐proven installation techniques• Built‐in totalizers• Built‐in power supply for pressure and
temperature transmitters
• 3940 to 1 turndown ratio• One‐ or two channel/path configurations• Velocity maximum may be higher in specific installations
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 7/12
Specifications for GF868
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 8/12
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 9/12
Flare Gas: Competition
•
–
High Maintenance:
•
transfer rate causing large errors or total failure
– Small Rangeability:•
Inability To
Measure
Low
Flow
Rates
• At low flow rates, 30 to 40 % error is very common
–
• Changes in MW, Viscosity, and Specific Heat ALL affect accuracy
– Liquid
Deposits:
• Evaporation of liquid on thermistor surface takes away heat causing erroneous errors
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 10/12
Flare Gas: Competition
• Advantages About GE SENSING (Panametrics)
–
GE
Sensing
can
Handle
Wider
Flow
Range
– GE Sensing can Handle Wider Temperature Range
– GE Sensing
transducers
are
made
of
Titanium
to
withstand
the
most
extreme process conditions (high reliability!)
– GE Sensing GF868 offers several different types of analog and digital
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 11/12
Flare Gas: Competition
•
– GE Sensing has the most experience with Flares Close to 5000
Flare Installations Worldwide!
– GE Sensing is the Industry Standard Texas &
– GE Sensing
Field
Service
Support
&
Experience
is
Far
Superior
Spanish‐speaking field engineers for the Latin American region
8/2/2019 Flare Gas OVW
http://slidepdf.com/reader/full/flare-gas-ovw 12/12
Flare Gas: Competition
•
– GE Sensing Offers a Wide Range of Installation Configurations for
different pipe sizes
– GE Sensing Insertion Mechanism allows transducers to be removed
rom p pe w ou e nee o ave a s u own
–
operator to immediately identify meter performance and process
stability