METHOD OF OPERATION OF THE COMBINED-CYCLE PLANT OF THE POWER PLANT Russian patent published in 2023 - IPC F01K23/10 F27B1/26 

FIELD: energy.

SUBSTANCE: invention can be used in thermal power plants. A method of operation of a combined-cycle plant of a power plant is proposed, through which atmospheric air is supplied to the turbocompressor of a gas turbine plant, 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 compressed in the turbocompressor are fed into the combustion chamber of the gas turbine plant, in the combustion chamber, the combustion of organic fuel is carried out with the formation of combustion products heated to a high temperature, the products of combustion of organic fuel are mixed with secondary air, the resulting gases are sent to the gas turbine, the gas expansion process is carried out in the gas turbine and the gas turbine cycle is performed, which is used on driving the turbocompressor and the electric generator, the gases exhausted in the gas turbine are fed to the waste heat boiler, where, in the process of cooling the gases, water vapor is generated in the main heat exchange surface, the water vapor is fed into a condensing-type steam turbine, consisting of a high-pressure cylinder and a low-pressure cylinder, the process is carried out in the steam turbine expansion of water vapor and the useful work of the steam-power cycle is performed, which is used for driving an electric generator, whereas intermediate overheating of the steam turbine of the condensing type of steam used in the high-pressure cylinder is carried out in the heat exchange surface of the intermediate superheater and heating of mains water in the heat exchange surface of the gas heater of mains water, which has been used in the steam turbine, water vapor is removed to the condenser, where, in the process of heat exchange with circulating water, water vapor is condensed, the condensate formed in the condenser is pumped to the waste heat boiler, and the total gas flow cooled in the main heat exchange surface is divided into two flows, the main gas flow in amount of 70–75% at a temperature of 100–120°C is fed to the exhaust gas duct, and the second gas flow in the amount of 25–30% is fed into a gas duct specially allocated in the tail part of the waste heat boiler, in which a regulating body, an additional fuel combustion chamber and a heat exchange surface of the intermediate superheater are installed sequentially along the gas flow, whereas gases in the additional combustion chamber are heated and cooled in the heat exchange surface of the intermediate superheater, the gases cooled in the heat exchange surface of the intermediate superheater are fed to the exhaust gas duct, where they are mixed with the main flow of gases cooled in the main heat exchange surface, the total continuous monitoring and maintaining at a predetermined level is provided in accordance with the mode of operation of the combined-cycle plant of the power plant for the temperature of the water vapor at the outlet of the heat exchange surface of the intermediate superheater by means of a gas flow controller in the tail section of the waste heat boiler, the gas duct in front of the additional fuel combustion chamber, and the regulating body installed in the exhaust gas duct of the waste heat boiler in front of the heat exchange surface of the gas-fired heating water heater, and the fuel flow regulator into the additional combustion chamber connected to the temperature sensor of the fuel heated in the heat exchange surface an intermediate superheater of water vapor and a regulating body installed on the pipeline for supplying fuel to the additional combustion chamber.

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

1 cl, 1 dwg