Boiler roof expansion joint sealing device

Abstract

The invention relates to an expansion joint sealing device of a boiler ceiling. Conventional steel plate sealing cannot realize free expansion between components, and the components are easily pull-cracked. The expansion joint sealing device consists of ceiling pipes (13), guard plates(10), comb-shaped plates (4), ripple expansion joints (1), circular expansion joints (12), pressing plates (2) and ceramic fiber paper (3). Connection forms comprise that a ceiling membrane type wall, peripheral membrane type walls, and pipelines (9) and hanging rods (8), which penetrate through a furnace roof are connected with the guard plates, wherein the ceiling membrane type wall, and the peripheral membrane type walls are connected with the guard plates in the manner that the comb-shaped plates are welded to the ceiling pipes and a water-cooled wall (7), the ripple expansion joints are additionally arranged between the guard plates and the comb-shaped plates, and the ceramic fiber paper is padded between the comb-shaped plates and the ripple expansion joints; the ripple expansion joints and the guard plates are in welding connection. The expansion joint sealing device disclosed by the invention is applied to the expansion joint sealing device of the boiler ceiling.

Description

Technical field: [0001] The invention relates to a sealing structure between a large-scale pulverized coal boiler ceiling membrane wall, surrounding membrane walls, pipes passing through the furnace roof, and suspenders, in particular to a boiler ceiling expansion joint sealing device. Background technique: [0002] The furnace and flue of a large pulverized coal boiler are fully sealed. However, the sealing of the membrane wall arranged around the ceiling, the heating surface of the pipe passing through the ceiling, the suspender, and the pipe cannot be achieved if only steel plates are used. The free expansion between components is easy to crack, which affects the safe operation of the heating surface. At present, the sealing structure of domestic power plant boilers is sealed with steel plates or bolted connections, and it is easy to crack at the corners of the steel plates. Invention content: [0003] The object of the present invention is to provide a boiler roof expa...

AI Technical Summary

Problems solved by technology

[0002] The furnace and flue of a large pulverized coal boiler are fully sealed. However, the sealing of the membrane wall arranged around the ceiling, the heating surface of the pipe passing through the ceiling, the suspender, and the pipe cannot be achieved if only steel plates are used. The free expansion between parts is easy to crack, which affects the safe operation of the heating surface. At present, the sealing structure of domestic power plant boilers is sealed with steel plates or bolted connections, and it is easy to crack at the corners of the steel plates.

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