GAS-STEAM UNIT OPERATION MODE Russian patent published in 2015 - IPC F02C6/00 

FIELD: power industry.

SUBSTANCE: invention relates to power engineering. The method comprises compression of a gaseous working body - air, heating of the compressed working body by fuel burning, expansion of the heated working body, utilisation of residual heat of the extended working body by water steam generation, supply of the produced steam to the gas path, steam condensation and extraction of water from combustion products. The working process is performed in two gas paths, with separate exhausts. Steam is generated in a heat-recovery boiler, then it is supplied into intermediate stages of the gas-steam-turbine unit for cooling of disks and blades of blade wheels and for the increase of the working medium flow rate, and also into combustion chambers. Condensation of extracted steam from the draw-off and water extraction from the combustion products is performed in two system heaters where the system water for the needs of a thermal consumer is heated and in the three-stage steam ejector which is supplied by steam from the heat-recovery boiler, and the resulted condensate is purified in the deaerator and in the condensate purification device, and then supplied into the heat-recovery boiler.

EFFECT: invention allows improving the efficiency of the unit, increasing capacity by the increase of the working medium flow rate.

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