Apparatus and method for recovering heat from fluid-bed type incinerator, and method for inhibiting production of dioxins

PURPOSE: To facilitate replacement work of a heat exchanger tube while preventing entanglement of incombustible on the heat exchanger tube by a method wherein the heat exchanger tube to be arranged in a fluidized bed of an incinerator is inserted vertically into a fluidized bed from a furnace wall part, a heat receiving medium flows in downward through the heat exchanger tube from the furnace wall part and is made to flow out upward via a curved part. CONSTITUTION: A fluidized bed type incinerator 11 performs an incineration treatment of combustible wastes such as city garbage in sand forming a fluidized bed 15. In this process, a heat exchanger tube 14 is inserted vertically from a horizontal part 13 of a wall of the furnace, steam for recovering heat flows downward through the heat exchanger tube 14 from the horizontal part 13 of the furnace wall, upward via a curved part 20 and then, is made to flow out from the horizontal part 13 of the furnace wall. Thus, the vertical insertion of the tube heat exchanger tube 14 into a sand layer can prevent the entanglement of incombustible in the sand layer on the heat exchanger tube 14 without closing a vertically moving fluid medium. In addition, a coupling part with the horizontal part 13 of the furnace wall is taken off to pull out the heat exchanger tube 14 thereby easily implementing the replacing of the heat exchanger tube 14 as well.