METHOD FOR COMBINED-CYCLE STEAM-AND-GAS PLANT OPERATION Russian patent published in 2017 - IPC F02C3/30 

FIELD: power industry.

SUBSTANCE: method for combined-cycle steam-and-gas plant operation includes air compression, fuel combustion, combustion gases mixing with superheated steam, steam and gas mixture expansion in the gas turbine, application of its effective power to generate electricity or to drive a gas-pumping unit. Thermal energy of the expanded gas and steam mixture is used to generate superheated steam injected into the combustion products, gas and steam mixture steam component separation and condensation, indirect evaporative cooling of the atmospheric air and increase of its humidity before compression, as well as cooling of the major part of the separated condensate due to the heat exchange of the atmospheric air and the major part of the separated condensate in a tubular heat exchange coil located inside a wet channel formed by the inner walls of the external pipeline and the outer walls of the internal pipeline. The input of the tubular heat exchange coil is connected to the condensate separator, and its outlet - with the cooled water injection device, the outer surface of the internal pipeline is covered by a capillary heat conducting layer wetted by the separated condensate, followed by evaporation of its part and feeding of the generated steam to the atmospheric air before compression.

EFFECT: invention allows to increase thermodynamic and economic efficiency of the plant.

2 cl, 2 dwg