COMBINED-CYCLE PLANT Russian patent published in 2000 - IPC

FIELD: thermal engineering. SUBSTANCE: plant has gas-turbine unit 1, steam-turbine unit with double-pressure steam turbine 2, heat-recovery boiler 3 provided with separating drums 4, 5, high- and low-pressure reheat surfaces 6,7, high- and low-pressure evaporating surfaces 8, 9, high- pressure economizer 10, deaerator evaporator 11 arranged along gas flow in heat-recovery boiler upstream of low-pressure evaporator 9, and condensate gas heater 12 placed along gas flow in heat-recovery boiler upstream of low-pressure evaporator 9; high-pressure deaerator 13 incorporating provision for deaerated condensate heating is hydraulically coupled at heating steam inlet through steam-water mixture line with outlet of deaerator evaporator 11, at steam outlet, with low-pressure drum 5 through reducing valve 14, at feedwater outlet, with feedwater inlets of high-pressure economizer 10 (through power-driven feedwater pump 15), low-pressure drum 5 (through reducing valve 16), and deaerator evaporator 11. Gas-turbine unit has water-cooled air cooler 17 hydraulically coupled at cooling-water inlet with condensate outlet of GHC 12; at cooling-water outlet it is coupled with condensate inlet of deaerator 13. EFFECT: increased steam output and low-pressure steam temperature, stream-turbine power capacity, and plant efficiency; improved reliability of equipment under all conditions. 1 cl, 1 dwg