METHOD FOR REDUCING POWER OF MANOEUVRING GAS-TURBINE POWER PLANT BELOW CONTROL LIMIT Russian patent published in 2014 - IPC F02C9/00 

FIELD: power industry.

SUBSTANCE: invention can be used to perform change-over of a manoeuvring gas-turbine power plant (GTP) including a combined-cycle plant (CCP) for maximum allowable minimum power at reduction of electrical load of a power circuit. A reduction method of power of GTP for its change-over to a mode of minimum electrical load consists in the fact that first, supply of fuel and the air compressed in the compressor to the combustion chamber is reduced to an allowable lower limit of an adjustment range determined by maximum allowable excess air coefficient. GTP power is additionally reduced by controlled bypass of some part of the air compressed in the compressor to its inlet after the lower boundary of the adjustment range is achieved, thus controlling bypass degree as per minimum allowable temperature of GTP exhaust gases and allowable emissions to atmosphere of nitrogen oxides.

EFFECT: possible reduction of air flow supplied to the combustion chamber to high limits in comparison to an adjustment air guide vane unit used for that purpose; with such GTP power reduction method, adjustment capabilities are enlarged with regard to the required fuel-to-air ratio.

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