BOILER Russian patent published in 1997 - IPC

FIELD: burning fuel in boilers provided with furnaces with circulating fluidized layer. SUBSTANCE: boiler has furnace 1 with circulating fluidized layer with dense fluidized dense fluidized layer 2 in its lower portion, high-temperature cyclone 3, by pass gas duct 4 and convective gas duct 5, fuel hopper 6, chutes 7 and 8 to return flue dust and supply fuel, primary cold air pipeline 9 and secondary hot air pipeline 10. Ports 11 for supply of flue dust to furnace are made at boundary of dense fluidized layer 2 and ports 12 for supply of fuel into furnace are made above this boundary. Fuel supply chutes 8 and connected with secondary air supply pipeline 10 by means of pipelines 13 with adjustable air flow rate sensors 14 connected with pressure sensors 15 mounted in ports 12. EFFECT: enhanced reliability. 2 cl, 1 dwg