WORK METHOD OF BOILER PLANT Russian patent published in 2017 - IPC F22B31/08 F22B33/18 

FIELD: power industry.

SUBSTANCE: work method of boiler plant, according to which feed water, fuel and air are supplied into the boiler, during the fuel combustion process combustion products are formed and superheated water vapour is produced in the boiler, the produced combustion products are sequentially cooled in a superheater, water economizer, air heater and are discharged into the atmosphere through the main gas duct by exhauster, natural gas is used as a fuel, pre-heating to air temperature of 20-30°C is carried out before its feeding into the air heater of the boiler operating on natural gas by part of exhaust combustion products with their cooling below the dew point in the condensation surface heat exchanger, installed in the bypass gas duct on the suction side of the exhauster.

EFFECT: increased reliability of the boiler plant due to elimination of low-temperature corrosion of the air heater heat-exchange surface.

3 cl, 1 dwg