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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
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!
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
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!
•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
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!
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.
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!
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.
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!
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!
Max Min
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!
Strainer - Duplex
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!
Gas Stop Valve
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!
Gas Speed/Ratio Valve
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!
Gas Speed/Ratio Valve Actuator
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!
Gas Control Valve
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!
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!
Gas Valves – All Woodward
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!
Filter
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+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
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!