FIELD: fluidized-bed reactors. SUBSTANCE: reactor includes lower zone 3 provided with fluidization grate 11, devices 12 for injection of primary air 12 below grate 11, devices 13 for injection of secondary air 13 above grate 11 and fuel supply devices 10; walls 5 bounding this lower zone are provided with heat exchange tubes; upper zone is bounded by walls 4 fitted with heat exchange tubes; heat exchange tubes are connected through projections. Walls of zones 2 and 3 are provided with vertical heat exchange panels so called expansion pieces secured perpendicularly on walls 4 and 5 of zones 2 and 3 formed by tubes inside reactor at width on level between 150 and 500 mm; intervals range from 1.5-fold and 4-fold width. This width is determined as distance between inner side of projections of walls 4 and 5 and farthest generatrix of farthest tube of expansion pieces. EFFECT: improved heat exchange coefficient of reactor walls. 9 cl, 12 dwg
