METHOD FOR OPERATION OF COMBINED CYCLE UNIT OF POWER PLANT Russian patent published in 2023 - IPC F01K23/10 

FIELD: thermal power plants.

SUBSTANCE: method for operation of a combined cycle power plant is proposed, in which atmospheric air is supplied to the turbocompressor of a gas turbine unit, where it is compressed to the required pressure, the air compressed in the turbocompressor is divided into primary and secondary, organic fuel and primary air are supplied to the combustion chamber of the gas turbine installation, and in the combustion chamber the process of combustion of organic fuel with the formation of combustion products heated to a high temperature, the combustion products of organic fuel are mixed with secondary air, the resulting gases are sent to a gas turbine, the gas expansion process is carried out in the gas turbine and the work of the gas turbine cycle is performed, spent on driving the turbocompressor and electric generator, exhaust in a gas turbine, gases are sent to a waste heat boiler, where in the process of cooling the gases, water steam is generated, water steam is supplied to the steam turbine, and exhaust gases are discharged into the atmosphere, in the steam turbine the process of expansion of water steam is carried out and the useful work of the steam power cycle is performed, spent on the drive of the electric generator, the water vapor exhausted in the steam turbine is discharged into the condenser, where, in the process of heat exchange with circulating water, the water vapor is condensed, the condensate formed in the condenser is supplied by a condensate pump to a gas condensate heater, where it is heated and discharged to the feedwater deaerator, the feedwater pumped is sent to a high-pressure water economizer, where it is heated and fed into a drum connected to the surface of a high-pressure evaporator; the dry saturated steam formed in the drum is sent to the heat exchange surface of a high-pressure steam superheater, where it is overheated and fed to a steam turbine, while the exhaust in the cylinder is overheated high-pressure steam turbine of water steam in the first stage of the intermediate superheater, located in a single-circuit waste heat boiler for generating water steam after the high-pressure water economizer along the gas flow, and secondary superheating of the water steam exhausted in the medium pressure cylinder of the steam turbine in the second stage of the intermediate superheater, located in a single-circuit waste heat boiler after the first stage of the intermediate superheater along the gas flow, while the water vapor flow reheated in the second stage of the intermediate superheater is supplied to the low pressure cylinder of the steam turbine, in which the expansion process of the water vapor generated in the high pressure evaporator is completed.

EFFECT: increasing the efficiency of the combined cycle unit of a power plant.

1 cl, 1 dwg