FIELD: power engineering; thermal power stations in generation of electric energy; combined plants including gas and steam turbines. SUBSTANCE: feed water is divided into two flows after condensate pump; one flow is heated stepwise in regenerative preheaters by steam of turbine; after each stage of heating part of feed water is separated and is introduced in other part of feed water passing through economizer zone of gas boiler to point of mixing of separate flows and is heated by waste gases; at points of mixing of separate flows temperatures are equal. EFFECT: enhanced efficiency. 1 dwg
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