Description
Technical Parameters
Technical Specifications
|
Manufacture |
GE |
|
Model |
DS200GDPAG1A |
| Part Number | DS200GDPAG1ALF |
|
Description |
25KHZ GATE DRIVER POWER |
|
Origin |
USA |
|
Dimension |
30*18*8cm |
|
Weight |
0.52kg |
Gas Fuel Control
The dry low NOx II (DLN–2) control system regulates the distribution of gas fuel to a multi–nozzle combustor arrangement. The fuel flow distribution to each fuel nozzle assembly is a function of combustion reference temperature (TTRF1) and IGV temperature control mode. By a combination of fuel staging and shifting of combustion modes from diffusion at ignition through premix at higher loads,low nitrous oxide (NOx) emissions are achieved.
Fuel gas is controlled by the gas stop/speed ratio valve (SRV), the primary, secondary and quaternary gas control valves (GCV) , and the premix splitter valve (PMSV). The premix splitter valve controls the split between secondary and tertiary gas flow.All valves are servo controlled by signals from the SPEEDTRONIC control panel.
It is the gas control valve which controls the desired gas fuel flow in response to the command signal FSR. To enable it to do this in a predictable manner,the speed ratio valve is designed to maintain a predetermined pressure (P2) at the inlet of the gas control valve as a function of gas turbine speed.
There are three main DLN–2 combustion modes:Primary, Lean–Lean, and Premix.
Primary mode exists from light off to 81% correctedspeed, fuel flow to primary nozzles only. Lean–Lean is from 81% corrected speed to a preselected combustion reference temperature, with fuel to the primary and tertiary nozzles. In Premix operation fuel is directed to secondary, tertiary and quaternary nozzles. Minimum load for this operation is set by combustion reference temperature and IGV position.
Gas Control Valves
The position of the gas control valve plug is intended to be proportional to FSR2 which represents called–for gas fuel flow. Actuation of the spring–loaded gas control valve is by a hydraulic cylinder controlled by an electro–hydraulic servovalve.
When the turbine is to run on gas fuel the permissives L4, L20FGX and L2TVX (turbine purge complete) must be 'true', similar to the liquid system.This allows the Gas Control Valve to open. The stroke of the valve will be proportional to FSR.
FSR goes through the fuel splitter (to be discussed in the dual fuel section) where the gas fuel requirement becomes FSR2, which is then conditioned for offset and gain. This signal, FSROUT, goes to the VSVO card where it is converted to an analog signal and then output to the servo valve through the TSVO card. The gas control valve stem position is sensed by the output of a linear variable differential transformer (LVDT) and fed back through the TSVO card to an operational amplifier on the VSVO card where it is compared to the FSROUT input signal at a summing junction. There are two LVDTs providing feedback ; two of the three controllers are dedicated to one LVDT each, while the third selects the highest feedback through a high–select diode gate. If the feedback is in error with FSROUT, the operational amplifier on the VSVO card will change the signal to the hydraulic servovalve to drive the gas control valve in a direction to decrease the error. In this way the desired relationship between position and FSR2 is maintained and the control valve correctly meters the gas fuel.
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