7 fa fuel gas

GE Power Systemse

Revision Date: 02/10/2000Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!Property of Power Systems University- Proprietary Information for Training Purposes Only!

7FA Fuel Gas System

DLN 2.6

GE Power Systemse


Fuel Gas System - Operations

•SRV & GCV's "Out of Position - Not Following Reference" (consult Control Spec. (A010))

•Alarm 0.5% for 3 seconds and

•Trip at 5.0% for 10 seconds

•LVDT Feedback Trouble - 1.5%

•LVDT Open Trouble +1.5%

Alarms and TripsVerify values to unit Control Specification A010

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•Gas Supply Condition Alarms (Site Specific Setpoints)

•Temperature:

•Low 404 F ( 206. 7 C );

•Low-Low 389 F (198.3 C )

•High Shutdown 390F ( 198.9 C ) (KFTG-SD)

•Pressure:High 475 psi

•Liquid level Alarm and unit shutdown – Scrubber

•High Differential Pressure Alarm – Strainer

•P2 pressure > 6.0 psig ignition inhibit

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Modified Wobbe Index (MWI)

Heating Value Density - The heating value as seen by the turbine’s fuel nozzles and control valve.

A measure of the interchangeability of gas fuels for a given system design

A relative measure of the energy injected to the combustor at a fixed pressure ratio

Calculated using the fuel lower heating value, the specific gravity with respect to air and the fuel temperature.

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The allowable MWI range is established to ensure that required

fuel nozzle pressure ratios are maintained during all

combustion/turbine modes of operation. When multiple gas fuels

are supplied and/or if variable fuel temperatures result in a MWI

that exceed the 5% limitation, independent fuel gas trains, which

could include control valves, manifolds and fuel nozzles, may be

required for standard combustion systems. For DLN systems, an

alternate control method may be required to ensure that the

required fuel nozzle pressure ratios are met.

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Max Min

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Strainer - Duplex

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Gas Stop Valve

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Gas Speed/Ratio Valve

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Gas Speed/Ratio Valve Actuator

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Gas Control Valve

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Gas Valves – All Woodward

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Filter

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7FA+e Gas Only Fuel Nozzle Assembly

Premix Gas Tube

Premix Gas Tube

Premix Gas Tube

Steam/Purge Tube

Atomizing Air Tube

Nozzle Cover

Fuel NozzleBlank Cartridge

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7 fa fuel gas

Education

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