FIELD: technological processes.
SUBSTANCE: boiler plant (10) with a fluidised bed and a method for preliminary heating of gas for combustion in a boiler plant with a fluidised bed, wherein boiler comprises furnace (12) and channel (24, 24b) for gas for combustion and steam-water cycle, comprising evaporative section (26), superheating section containing last superheater (30'), and steam turbine (34) and steam superheat channel, intended for steam transfer from evaporation section (26) through steam superheater section to steam turbine, and first gas heater (38, 38b) for combustion, wherein boiler unit with fluidised bed comprises second gas heater (40, 40b) for combustion, a steam extraction line (46, 46b) connected to the downstream of the second gas heater and to the steam superheater at a location upstream of last superheater (30') to move steam from the superheater steam to second heater (40, 40b) of combustion gas, wherein the gas pre-heating method for combustion comprises moving steam from the superheat circuit from a location upstream of the last superheater, by means of line (46, 46b) of steam extraction to the second gas heater (40, 40b) for combustion and heat transfer from steam to combustion gas in the second gas heater for combustion.
EFFECT: disclosed is a method for preliminary heating of gas for combustion in a boiler plant with a fluidised bed.
13 cl, 2 dwg
