BOILER PLANT Russian patent published in 2007 - IPC F23L15/00 E04H12/28 F23J11/00 

FIELD: heat power engineering.

SUBSTANCE: boiler plant comprises boiler whose gas duct is connected with the chimney provided with ventilated air space between the load-bearing ferroconcrete shaft and lining that defines the gas discharging passage, heat exchanger for heating air, and fan for supplying air heated in the heat exchanger to the ventilated air space in the chimney. The heat exchanger and fan underlies the gas discharging passage of the chimney. The lining and the load-bearing shaft of the chimney are provided with inlet and outlet ports. The boiler plant is additionally provided with the duct for discharging heated air from the space of the chimney to the boiler for burning fuel. The discharging duct is composed of several sections. The ring section of the duct with varying width bounds the chimney from above at a level of outlet ports and is connected with the straight section of the duct mounted on the outer side of the chimney.

EFFECT: enhanced efficiency.

3 dwg