▎ 摘　　要

NOVELTY - The utility model claims an expansion joint of a catalytic cracking, specifically relating to the technical field of the catalytic cracking, comprising a connecting pipe main body, the connecting pipe main body is provided with two flanges, two flanges are symmetrically arranged on the connecting pipe main body central axis, between two flanges is provided with a corrugated pipe, one end of the corrugated pipe close to the flange is welded with the flange. The utility model makes the corrugated pipe connected with the connecting pipe main body through the flange, it can avoid the corrosion problem of the dissimilar steel welding, at the same time, the inner wall of the corrugated pipe is sprayed with anti-corrosion layer made of graphene-corrosive paint, which improves the corrosion resistance and corrosion resistance of the corrugated pipe, so that it has good chemical corrosion resistance, and the corrugated pipe is made of titanium material, so that the corrugated pipe itself has strong corrosion resistance, and the whole structure is connected by the flange, the anti-corrosion layer made of graphene-corrosive paint is matched with the self titanium material, it can improve the corrosion resistance of the utility model. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the expansion joint of a catalytic cracking device.