METHOD OF OPERATION OF STEAM-GAS PLANT OF POWER PLANT Russian patent published in 2021 - IPC F01K23/10 

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering and can be used at thermal power plants. To increase efficiency of steam-gas plant of power plant gas turbine plant is equipped with intermediate air cooler, and turbo-compressor of gas turbine plant is made two-stage with steps of low and high pressure and intermediate cooling of cyclic air compressed in low-pressure stage is performed before its supply to high-pressure stage in intermediate air cooler by feeding circulating water heated to temperature of 30–35 °C into its heating path in condenser of steam turbine. Besides, steam-gas plant is additionally equipped with two recuperative gas-water heat exchangers and turbine expander, working body in which is natural gas, at that, to increase turbine expander power and to ensure positive temperature of natural gas at turbine expander outlet, heating of natural gas to temperature of 80–90 °C before turbine expander, as well as heating of natural gas spent in turbo-expander to temperature of 140–150 °C before its supply to power boilers to increase their cost effectiveness, is carried out heated in intermediate air cooler to temperature of 190–200°C by circulation water in recuperative gas-water heat exchangers, one of which is installed in the direction of movement of natural gas before the turbo-expander, and the second one - after the turbine expander. Heating channels of recuperative gas-water heat exchangers are connected in parallel to the discharge pressure pipeline to the cooling tower after the intermediate air cooler.

EFFECT: technical result is higher efficiency of steam-gas plant of power plant.

1 cl, 1 dwg