FIELD: burning low-calorie fuel, mainly waste lumber and bark in industrial heat-power engineering. SUBSTANCE: fuel is subjected to in complete burning in primary furnace in fluidized bed of inert material; gaseous products of gasification are subjected to reburning in boiler furnace at simultaneous entrainment of fine particles of fuel. Fine particles of unburned fuel which are entrapped in separation systems in ash hopper are returned to primary furnace for reburning. EFFECT: enhanced efficiency. 2 cl, 1 dwg
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