Method for repairing inner wall of acid-making absorption tower

Abstract

The invention provides a method for preparing an inner wall of an acid-making absorption tower. After an upper head of the absorption tower of which an upper connection pipeline is removed is hung and stabilized, a flange connecting piece is disassembled; and after the flange connecting piece is disassembled, an upper tower body is hung onto the ground. A man hole is cut out at a downward position of the upper tower body in a range of 1.65 to 1.7m, a lead lining layer is separated from a tower wall steel plate, a slate pencil is used for marking, a marked part is cut apart by gas welding and the upper tower body is hung onto the ground. The lead lining layer at the repaired position is cut off, and then a tower wall steel plate is ground and processed by hydrochloric acid. The tower wall steel plate is subjected to lead patching by a lead bar, a thickness of carrying out lead patching for the first time is 2.5 to 3.6mm, and a thickness of carrying out lead patching for the second time is 1.5 to 2.5mm. The man hole is enveloped with a lead plate with a thickness of 4.5 to 5.5mm, and a joint is completely full-welded; then leakage testing is carried out by hydrochloric acid until no leakage point is generated and the acid-making absorption tower is qualified. According to the method provided by the invention, the problem of internal leakage of the absorption tower can be effectively solved, blockage of a sulphuric acid pump and a sulfuric acid cooler is avoided, the service life of an acid-making pipeline is prolonged, repair cost is reduced, a personal injury accident caused by acid leakage is avoided, and stability of production of an acid-making system is improved.

Description

technical field [0001] The invention belongs to the technical field of coking equipment, and in particular relates to a method for repairing the inner wall of an absorption tower in a desulfurization and acid production process. Background technique [0002] The absorption tower is an important equipment for the desulfurization and acid production process in the coke oven gas purification process. It is divided into two parts: the upper tower body and the lower tower body. The outermost layer of the lower part of the absorption tower is a steel plate tower wall, the inner wall of the steel plate tower wall is provided with a lead lining layer, and the lower section is also built with a brick lining layer between the inner wall of the tower wall and the lead lining layer. During the long-term operation of the absorption tower, the lead-lined layer is prone to bulging and leakage. The acid mud formed after the lead-lined layer is corroded by sulfuric acid flows back into the a...

AI Technical Summary

Problems solved by technology

During the long-term operation of the absorption tower, the lead-lined layer is prone to bulging and leakage. The acid mud formed after the lead-lined layer is corroded by sulfuric acid flows back into the absorption tower, causing a series of problems such as blockage of the sulfuric acid pump and sulfuric acid cooler. , not only increases the cost of pipeline maintenance, directly affects the stability of the acid production system, but also easily causes personal injury accidents

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