FIELD: thermal engineering. SUBSTANCE: furnace heater of fluidized-bed reactor has a number of tubular elements relatively arranged so that they form flat surface in which tubular elements 362, 366 are mechanically joined together. Heater elements 362, 366 of preferably rectangular section are joined together through slot 364 or similar member and boss 370 or similar member of actually same shape as slot. Fluidized-bed reactor provided with furnace heater is also given in description of invention. EFFECT: reduced manufacturing time and improved mechanical endurance of heater operating in fluidized- bed reactor. 15 cl, 8 dwg
