Manufacturing process of close-wound wall sticking coil tubes for large-scale equipment

Abstract

The invention relates to a manufacturing process of coil tubes in equipment, which comprises the following steps of: (1) performing the test and calculation of springback amount on enwinding materials according to the shape and curvature of the shell wall of a set of large equipment and manufacturing an enwinding die; (2) arranging parison tubes of multiple groups of wall sticking coil tubes sequentially, machining welding beveled edges at splicing positions, positioning and compressing the parison tubes by using a clamp, welding the parison tubes, polishing the surplus height of welded joints, and detecting the flaws in the welded joints to check if the welded joints are qualified; (3) determining an initial position on the die, and enwinding the parison tubes of multiple groups of wall sticking coil tubes on the die continuously; (4) performing stress relieving and setting on the wall sticking coil tubes formed by enwinding; and (5) putting the wall sticking coil tubes formed by enwinding into the large equipment, determining an initial position on a shell wall of the large equipment according to a positioning block, and bonding the wall sticking coil tubes formed by enwinding on the shell wall of the large equipment closely under the action of a close-sticking device. The manufacturing process has the advantages of convenient operation, high machining efficiency, easy guarantee of product quality and little loss of raw materials during the welding of the parison tubes of the wall sticking coil tubes.

Description

technical field [0001] The invention relates to a manufacturing process of coiled pipes in equipment, in particular to a manufacturing process of closely wound wall-attached coiled pipes in large-scale equipment. Background technique [0002] With the development of the chemical industry, chemical equipment is gradually becoming larger and more complex in structure. Take the large-scale equipment oxidation furnace—waste heat boiler as an example. It is the core equipment in the nitric acid production plant, and its performance directly affects the nitric acid The output of the device. Large-scale oxidation furnace—the inner diameter of the waste heat boiler equipment shell reaches 3000-3300mm. On the equipment shell wall composed of elliptical head, cylinder body, variable diameter section and main flange, there are multiple groups of continuous winding water-cooled Coils and water-cooled coils must be closely attached to the inner wall of the equipment. The length of each ...

AI Technical Summary

Problems solved by technology

In this way, when the butt joint is carried out, it is not carried out on a straight line but on a circular arc, resulting in inconvenient welding operations, low processing efficiency, affecting welding quality, and poor forming quality, which makes it difficult to meet equipment assembly requirements and affect equipment replacement. Thermal Effects and Overall Performance

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