Replacement construction technology of secondary superheater for dry quenching boiler

Abstract

The invention discloses a replacement construction technology of a secondary superheater for a dry quenching boiler, comprising the following steps: (1) removing an original platform on a front wallboard, and building an overhauling platform on the front side of a boiler body; (2) removing the front wallboard; (3) removing the secondary superheater: pulling the secondary superheater out of the front wallboard in the front of the boiler; (4) reassembling the secondary superheater; (5) reassembling the front wallboard and cut pipelines in sequence; (6) after the pipelines are installed, performing a hydrostatic test and welding fully the wallboard after passing the hydrostatic test. By adopting the technology of the invention, the secondary superheater is not hoisted out from the top of theboiler but is pulled out from the front side of the boiler after the front wallboard is opened, so a top board, a silencer, a boiler barrel, a rear wallboard and an expansion joint do not need to be removed, and the workload for removing the connection pipeline between the silencer and the boiler barrel is not required, thus saving mechinery-purpose machine-team and construction time, improving overhauling benefit and obtaining obvious economic benefit and social benefit.

Description

technical field [0001] The invention relates to a dry quenching boiler maintenance process, in particular to a dry quenching boiler secondary superheater replacement construction process. Background technique [0002] The construction method of the CDQ boiler secondary superheater replacement project is relatively complicated, with a large workload and a long construction period of about 45 days. The general construction process requires the following steps: [0003] Before construction, pour new front and rear wall panels and roof panels, install reinforced maintenance platforms at the front and rear wall panels of the secondary superheater, and remove the boiler top platform. Remove the muffler (6.2T) and drum (26T) on the top of the boiler after the boiler is shut down, cooled down, and depressurized, and the pipes connected to the drum and economizer are cut off, and 22 of them are pressure pipes with a diameter of The largest is 219mm and 10mm thick. [0004] Then, re...

AI Technical Summary

Problems solved by technology

At the same time, the front and rear wall panels and roof panels must be fully welded, and the number of pressure pipe welds is large and the quality requirements are high, so the welding workload is heavy

In addition, since the roof and wall panels must be poured with the steel structure facing downwards and the refractory materials facing upwards, they cannot be installed directly during hoisting and must be turned over, which also requires higher lifting operations

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