BOILER UNIT OPERATION METHOD Russian patent published in 2023 - IPC F22B33/18 

FIELD: thermal power engineering.

SUBSTANCE: invention can be used in natural gas-firing boilers. In the proposed method of operating a boiler plant, feed water, organic fuel and air are supplied to the boiler. Blowdown water, water vapor and combustion products are removed from the boiler, which are cooled in a steam superheater, water economizer, air heater and condensing surface heat exchanger. The exhaust combustion products cooled below the dew point in a condensing surface heat exchanger are heated in a recuperative heat exchanger and discharged to the atmosphere. The blowdown water removed from the boiler is directed to a continuous blowdown expander. The secondary water vapor formed in the continuous blowing expander from the blowing water is directed through a steam line into the flow of exhaust combustion products by means of a steam distribution device made in the form of a perforated manifold and installed in the gas duct in front of the condensation surface heat exchanger along the flow of combustion products. Secondary water vapor is condensed on the outer surface of the condensation surface heat exchanger. The exhaust combustion products cooled below the dew point in the condensation surface heat exchanger are heated in the recuperative heat exchanger by the concentrate removed from the continuous blowdown expander. The boiler unit is equipped with a surface heat exchanger. Air is preheated before feeding it into the boiler air heater in a surface heat exchanger by feeding into its heating path a continuous blowing concentrate partially cooled in a recuperative heat exchanger in the process of heating the exhaust combustion products cooled below the dew point in a condensing surface heat exchanger.

EFFECT: reliability and efficiency of the boiler unit is increased.

1 cl, 1 dwg