FURNACE FOR BOILER Russian patent published in 2003 - IPC

FIELD: boiler furnaces for burning solid fuel on fire grates in layers. SUBSTANCE: furnace has fuel supply unit, fire grate with delivery of primary air, secondary air nozzle located on front and rear walls; swivel secondary air nozzles are located at different levels relative to furnace height; lower secondary air nozzles are located below fuel supply unit but above fire grate; upper secondary air nozzles are located above fuel supply unit. Fire grate is immovable. Fire grate of return and direct travels is movable. Lower secondary air nozzles are located on front wall of furnace. Fire grate is inclined. Lower secondary air nozzles are located opposite travel of movable fire grate. Lower secondary air nozzles are located on rear wall of furnace. Angle of inclination of fire grate is up to 40 deg. Trajectory of motion of solid particles of fuel in furnace and that of flue gases in gas duct is increased. Invention ensures enhanced efficiency of burning fuel due to reduction of chemical and mechanical incomplete combustion. EFFECT: enhanced efficiency. 10 cl, 3 dwg