COMBINED CYCLE GAS TURBINE WITH COOLED DIFFUSER Russian patent published in 2020 - IPC F01K23/10 F01D25/30 

FIELD: heat power engineering.

SUBSTANCE: invention relates to heat engineering and can be used in power gas-steam units of binary type. Combined cycle gas turbine comprises gas turbine plant with outlet diffuser of optimum geometry, steam waste heat boiler, in gas duct of which there are steam generating circuits of two pressures, containing economizing and evaporation surfaces of two pressures and high pressure steam superheater, steam turbine plant with a condenser and two steam turbines, the first of which at the steam inlet is communicated with the steam high-pressure steam superheater output by steam, at the steam output is connected to the second turbine inlet by steam, second steam turbine at steam outlet is communicated with inlet of two condensers communicated at condensate outlet with heat recovery boiler input by condensate, intermediate superheater of low pressure communicated at steam inlet with outlet of drum-separator of low pressure, communicated at outlet by steam with steam turbine second input, wherein the steam superheater is in form of a steam-gas recuperator arranged on the surface of the outlet diffuser of the gas turbine, and is communicated at the inlet to the heating gases, respectively, with the gases output from the gas turbine and at the outlet to the gas inlet into the main gas duct of the heat recovery boiler.

EFFECT: invention reduces heat loss to the environment through the diffuser surface, provides ease of outer coating of the outlet diffuser by heat insulation, allows to increase total heat drop actuated in steam turbines due to reduction of pressure losses in diffuser path and intermediate steam superheater circuit.

1 cl, 2 dwg, 1 tbl