FIELD: combustion of solid fuel, primarily wood residue and peat. SUBSTANCE: unit has vertical prismatic combustion chamber with constrictor in the form of gas vent, tangential overgrate-blast nozzles, chute grate, and afterburning grate. Furnace gas circulating channels arranged under chute grate have their inlet and outlet ports connected through chute grate to combustion chamber. EFFECT: improved economic efficiency and simplified design of unit. 3 cl, 2 dwg
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