FIELD: combustion of solid fuels including those of low grade in stoves and boilers. SUBSTANCE: furnace has combustion chamber 1 with gas vent 2, burners 3, and slag disposal system at bottom; burners 3 are tangential to furnace volume and are mounted upstream of gas vent 2. Wall of combustion chamber 1 located downstream of gas vent 2 along flow, that is, in jet heating and igniting section, may be made of brickwork or of waterwalls 6 encased in brickwork 3 for warmth keeping. EFFECT: improved economic efficiency and environmental friendliness. 4 cl, 2 dwg
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