BURNING APPARATUS, PROCESS FOR PRODUCING OXIDE CATALYST, AND PROCESS FOR PRODUCING UNSATURATED ACID OR UNSATURATED NITRILE

摘要

A burning apparatus comprising a burning tube which has openings at both ends, a pair of hoods which respectively cover the openings in the burning tube, and a pair of rings each of which closes a gap between the burning tube and each of the hoods, wherein each of the rings is fixed to the outer surface of the burning tube directly or indirectly, a groove is formed on the hood-contacting surface side of each of the rings along a circumferential direction of each of the rings, a seal chamber surrounded by each of the hoods and the groove is formed, and the burning tube and the rings are so adapted as to rotate together in a circumferential direction of the burning tube while bringing the both sides of the groove into contact with each of the hoods.