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Fuel Gas Conditioning Systems
Fuel Gas Conditioning Systems
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Wide Variety
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From Pipeline
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To Turbine
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• Cleaning Stages– Knockout– Fine Filtration– Last Chance Filter
• Pressure Reduction
• Flow Metering
• Heating
From the Pipeline to the Turbine
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Fuel Gas Specifics
Leaves the Pipe LineLeaves the Pipe Line• 700 – 1000 psig• 7 lb/ mmSCF• 30-90 °F• Aerosols and Particulate
Enters the TurbineEnters the Turbine• 350-450 psig• 7 lb/ mmSCF• Up to 350 °F• Free from Aerosols and
Particulate
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Fuel Gas Composition• Sweet:
– Typical Natural Gas– Does not contain
significant amounts of H2S or CO2
• Sour:– High H2S Content
– Highly Corrosive– NACE
Typical Fuel Gas Composition
Component Mol %
Methane 95.513
Ethane 2.45
Propane 0.506
N-Butane 0.1
I-Butane 0.11
N-Pentane 0.022
I-Pentane 0.036
Neo-Pentane 0.0
Hexane+ 0.054
Oxygen 0.0
Carbon Dioxide 0.853
Nitrogen 0.356
Maximum Total Sulfur
0.0
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Knockout (Scrubber)• Primary Filtration• Gross Liquid and/or Solid Removal• Mechanical Separation
– Vanes – impingement– Multi Cyclones – centrifugal force
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Knockout Accessories
• Drain Tank• Level Indicator• Level Switches• Automatic Drain Valve• Relief Valve• Pressure Gage• Differential Pressure
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Pressure Reduction
• Sliding Stem Valves with Positioners
• Reduces the pressure of the gas from 700-1000 psi to 400-450 psi
• Protects Turbine• Improves Turbine
Efficiency
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Fine Filtration
• Filter Separators– 99% 0.5 – 3 micron
• Coalescer– 99.98% of .3 μm
• Solids and Liquids• Dual Filters• < 3 psi Drop Clean
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Filter Accessories
• Ladder and Platform• Isolation Valves• Level Indicator• Level Switches• Automatic Drain Valve• Relief Valve• Pressure Gage• Differential Pressure
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Performance Heater• Shell and Tube Heat
Exchanger– 100% of Gas Flow– Heats Gas to ~350 °
• Boiler Feed Water• Controlled by Throttling
Water Discharge
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Start-Up Heater
• Electric Heater– ~25% of Gas Flow– 50 F Temperature Rise
• 50 F Above Dew Point• SCR or Step Control
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Water Bath Heater• Gas Fired Heater
– 100% of Gas Flow– Heats Gas to ~180 °
• U-Bend• Controlled by Throttling
Gas Flow/Bypass
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Detection Tank
• Mechanical Separator – Multi-Cyclone
• Capture Water from Heat Exchanger Leak
• Instruments– Level Switches– Level Gages– Level Transmitters
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Flow Metering
• Custody Transfer– Not Clark-Reliance
• Individual Turbine Flow Measurement
• Orifice Meter
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Last Chance Filter
• Final Stage of Protection for Turbine
• Coalescing Filter• 99.98% Removal
of .3 μm particles• Level Instruments• Manual Drain• Differential Pressure
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Sales Opportunity - Filtration
• Filter Vessels – Anderson Product– AMCS– AVGS– ACF
• Elements• Aftermarket
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Sales Opportunity - Instrumentation• Jerguson
– Level Gages– Mag Gages– Level Switches
• Other – Pressure Gages– Differential
Pressure– Temperature
Gages
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SIEMENS – EVANDER ANDREWS
• Scope– Vane
Separator– Coalescer– Drain Tank– Level
Controls– Piping– Valves– Junction Box
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CALPINE – OTAY MESA
• Scope– Electric Startup Heater with SCR Control Panel– Performance Heat Exchanger
•Vane Separator
•Coalescing Filter
•Piping•Valves
•Drain Tank
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JANTESA – SANTA ROSA
• Scope– Unit Skids– Electric Heater– Heat Exchanger– Coalescing
Filters– Automatic
Valves– Piping– Junction Box
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UE – TRACY STATION
• Scope– Vane Separator– Pressure Reducing
Valves– Flow Measurement– Piping and Valves– Water Bath Heater
• ETI
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UE – NRG – CEDAR BAYOU• Performance Heaters• Startup Heaters with
SCR Control Panels
• Coalescing Filters• Multi-Cyclones• Instrumentation
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Conclusion
• Fuel Gas Filtration equipment controls – Temperature– Pressure– Contaminant
• A variety of setups are used to manage a variety of situations