Fuel Gas Conditioning Systems

Fuel Gas Conditioning Systems

Wide Variety

From Pipeline

To Turbine

• Cleaning Stages– Knockout– Fine Filtration– Last Chance Filter

• Pressure Reduction

• Flow Metering

• Heating

From the Pipeline to the Turbine

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

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

Knockout (Scrubber)• Primary Filtration• Gross Liquid and/or Solid Removal• Mechanical Separation

– Vanes – impingement– Multi Cyclones – centrifugal force

Knockout Accessories

• Drain Tank• Level Indicator• Level Switches• Automatic Drain Valve• Relief Valve• Pressure Gage• Differential Pressure

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

Fine Filtration

• Filter Separators– 99% 0.5 – 3 micron

• Coalescer– 99.98% of .3 μm

• Solids and Liquids• Dual Filters• < 3 psi Drop Clean

Filter Accessories

• Ladder and Platform• Isolation Valves• Level Indicator• Level Switches• Automatic Drain Valve• Relief Valve• Pressure Gage• Differential Pressure

Performance Heater• Shell and Tube Heat

Exchanger– 100% of Gas Flow– Heats Gas to ~350 °

• Boiler Feed Water• Controlled by Throttling

Water Discharge

Start-Up Heater

• Electric Heater– ~25% of Gas Flow– 50 F Temperature Rise

• 50 F Above Dew Point• SCR or Step Control

Water Bath Heater• Gas Fired Heater

– 100% of Gas Flow– Heats Gas to ~180 °

• U-Bend• Controlled by Throttling

Gas Flow/Bypass

Detection Tank

• Mechanical Separator – Multi-Cyclone

• Capture Water from Heat Exchanger Leak

• Instruments– Level Switches– Level Gages– Level Transmitters

Flow Metering

• Custody Transfer– Not Clark-Reliance

• Individual Turbine Flow Measurement

• Orifice Meter

Last Chance Filter

• Final Stage of Protection for Turbine

• Coalescing Filter• 99.98% Removal

of .3 μm particles• Level Instruments• Manual Drain• Differential Pressure

Sales Opportunity - Filtration

• Filter Vessels – Anderson Product– AMCS– AVGS– ACF

• Elements• Aftermarket

Sales Opportunity - Instrumentation• Jerguson

– Level Gages– Mag Gages– Level Switches

• Other – Pressure Gages– Differential

Pressure– Temperature

Gages

SIEMENS – EVANDER ANDREWS

• Scope– Vane

Separator– Coalescer– Drain Tank– Level

Controls– Piping– Valves– Junction Box

CALPINE – OTAY MESA

• Scope– Electric Startup Heater with SCR Control Panel– Performance Heat Exchanger

•Vane Separator

•Coalescing Filter

•Piping•Valves

•Drain Tank

JANTESA – SANTA ROSA

• Scope– Unit Skids– Electric Heater– Heat Exchanger– Coalescing

Filters– Automatic

Valves– Piping– Junction Box

UE – TRACY STATION

• Scope– Vane Separator– Pressure Reducing

Valves– Flow Measurement– Piping and Valves– Water Bath Heater

• ETI

UE – NRG – CEDAR BAYOU• Performance Heaters• Startup Heaters with

SCR Control Panels

• Coalescing Filters• Multi-Cyclones• Instrumentation

Conclusion

• Fuel Gas Filtration equipment controls – Temperature– Pressure– Contaminant

• A variety of setups are used to manage a variety of situations