FIELD: heat-power engineering; thermal power stations with high-efficiency units. SUBSTANCE: main feed water pipe line and bypass pipe line are additionally inter-connected by means of pipe line fitted with two gates between which heating loop of additional gas-and-liquid heat exchanger is connected; heated loop of this heat exchanger is connected to air line of air preheater via gate valve; it is provided with bypass air duct fitted with similar gate valve. EFFECT: enhanced efficiency of boiler plant and reduced consumption of fuel in nominal mode due to increased temperature of air fed to boiler at simultaneous deep cooling of flue gases. 1 dwg
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