PURPOSE:To keep the mean diameter of the air bubble group rising through a fluidized bed in a relatively small size by setting a specific buffle horizontal area to the range of 0.15 - 0.40/m. CONSTITUTION:The buffle 34 of the lowermost stage is provided at the position where the vertical distance from a dispersing plate 4 is shorten than the diameter of a fluidized bed 12, that is, the diameter of the inner peripheral surface 3 of the side wall of a tower main body 2. The falling stream of the particle group in the vicinity of the inner peripheral surface 3 of the side wall having the max. falling flow velocity in the fluidized bed 12 is obstructed by buffles 34, 36 each having specific width and a specific buffle horizontal area and guided so as to flow in the vicinity of the center axis of the fluidized bed 12. As a result, the flow of air bubbles ready to gather to the vicinity of the center axis of the fluidized bed 12 is obstructed by the particle falling stream flowing in the vicinity of the center axis of the fluidized bed to be pushed away in the outer peripheral direction of the fluidized bed, and the air bubble group flows through the fluidized bed in a relatively uniform manner.
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