GE manual Gas Turbine Operability, Large Operability Window

Gas Turbine Operability

Large Operability Window

GE Energy offers a variety of innovative design solutions to maximize the operability window of the Oil & Gas gas turbine fleet. In addition to variable stator vanes and blow-off valves, the design solutions include:

-variable turbine nozzle guide vanes

-a variable bypass combustion chamber

-a high turn-down capability combustion chamber

-CPC optimizing control logic

The various combinations of design solutions are specifically adapted to the demands of the marketplace for each gas turbine model.

For example: The GE10-2 DLN (Dry Low NOx) model utilizes a variable bypass combustion chamber to maintain the optimum flame temperature for low emissions all the way down to 50% load, and the variable nozzle guide vanes of the free power turbine to ensure that the gas generator shaft speed is always at the design value, thereby ensuring maximum output.

The MS5002D instead uses variable nozzle guide vanes to maintain maximum output on the standard model, and maintain the optimum flame temperature for low emissions down to 50% load on the DLN model. They are also used in regenerative cycle applications to maximize the efficiency of the regenerator and hence to maximize fuel economy.

The brand new MS5002E makes use of the DLN2 combustion design used in GE’s F-Class machines to ensure low emissions over a range of flame temperatures, thereby delaying the opening of the blow-off valves at part load while maintaining the highest possible efficiency at base-load.

Note that the flexibility given by each of these solutions gives a further performance advantage on cold days with respect to other engines that are forced to open blow-off valves (to meet environmental emissions laws) even at base-load.

MS5002D Gas Turbine

20 GE Energy Gas Turbines