FIELD: heat-and-power engineering.
SUBSTANCE: invention relates to heat engineering, in particular to devices for air heating and heat recovery of exhaust flue gases, and is intended for use in fuel-burning plants, for example in hot water and steam boilers of thermal power plants. Core of invention is that the air to flow into the steam heater is additionally heated in a solar heater by the heat converted from the Sun energy and in a heat exchanger installed in before the steam heater. Herewith the solar heater is made with the possibility of heating the water circulating through it, which is used as a heating medium in the heat exchanger.
EFFECT: technical result achieved by the present invention is higher efficiency of the air heating system operation while maintaining reliability of the equipment and optimum parameters of the heat carriers.
1 cl, 1 dwg
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