PURPOSE: To efficiently react a powder and gas using a fluidized bed by forming the gas jet orifices of a gas dispersing plate into a tubular shape and providing a lid body and further providing a gas introducing part equipped with a heat exchange type heating means under the dispersing plate and providing perforations to the rotary shaft of a stirring means.

CONSTITUTION: In an apparatus subjecting a granular powder and gas to contact reaction at high temp., the gas jet orifices of a gas dispersing plate are formed into a tubular shape and a lid body is provided. Heating means, pref., electric resistance heating means 207 are provided to the lower part of a reaction container 200 and the outer wall of a gas introducing pipe 202. Further, a liquid introducing pipe is connected to the rotary shaft 306 of a blade type rotary stirring means 300 so as to guide cooling water to the rotary shaft 306. During reaction, a granular powder falls along the rotary shaft and moves to the inner wall of the tower-shaped reaction container by stirring blades to rise along the inner wall. By repeating this operation, solid-gas contact is improved and reaction efficiency can be enhanced.