| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical diffuser whose cylindrical part is prevented from having holes and dropping and to provide a multistage fluidized bed reactor provided with the cylindrical diffuser. SOLUTION: The wear resistance of this cylindrical diffuser is enhanced by inserting a inner cylinder made from a ceramic into the cylindrical part. One of silica, alumina and silicon tetranitride is preferably used as the ceramic. In this multistage fluidized bed reactor having a plurality of partition walls for dividing the inside in the height direction the ceramic-made inner cylinder- inserted cylindrical diffusers are used as at least a part of the cylindrical diffusers to be arranged on the undersurface of each of the partition walls for preventing them from having holes and dropping.
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