U-shaped heat exchange pipe and pipe plate welding process and application thereof

Abstract

The invention relates to the technical field of quench cooler preparation, in particular to a U-shaped heat exchange pipe and pipe plate welding process and application thereof. The U-shaped heat exchange pipe and pipe plate welding process comprises the steps of (1) groove machining; (2) groove clearing and inspection; (3) pipe penetrating of a heat exchange pipe according to rows; (4) pairing and priming coat welding; (5) priming coat detecting; (6) cover face layer welding; (7) cover face layer detecting; and (8) pressure-resistant testing. A groove in the welding part of the heat exchangepipe and a pipe plate is changed from an inner groove in an original method to a V-shaped outer groove, and is welded through manual argon arc welding instead of inner hole welding, and thus the manufacturing cost is greatly lowered. Meanwhile, in order to meet the condition that manual argon arc welding replaces inner hole welding, traditional pipe penetrating of the heat exchange pipe accordingto columns is changed to pipe penetrating of the heat exchange pipe according to rows, thus the interval between two adjacent welded junctions becomes large, thus the heat exchange pipe and the pipe plate can be welded through manual argon arc welding, and the preparation cost of a quench cooler is significantly lowered while the welding quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of quench cooler preparation, in particular to a U-shaped heat exchange tube and tube sheet welding process and its application. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] The quencher is the key equipment of the fluorine chemical project. The working temperature of the metal wall of the tube side is generally 162°C, the design temperature is 400°C, and the temperature of the working medium is 680°C (inlet) / 180°C (outlet). When the equipment is running, the inlet side pipe The average metal wall temperature of the plates is nearly 400°C. The quench cooler is a U-shaped heat exchange tu...

AI Technical Summary

Problems solved by technology

[0004] However, the inventors found that in the welding process of the heat exchange tube and the tube sheet, due to the large size of the heat exchange tube, if the inner hole welding machine is used for welding (as shown in the attached figure 1 As shown), it is necessary to purchase special welding equipment for inner hole welding, but the cost of a single inner hole welding equipment is hundreds of thousands of yuan, which is relatively high. idle waste

If the structure is changed to a fillet joint structure, due to the high temperature at this end, the tensile strength of the material is reduced, and the thickness of the fillet weld is thin, resulting in weld strength that cannot meet the requirements, and the outer wall of the heat exchange tube after welding and the tube There is a gap between the inner sides of the welding holes on the board, and the gap directly faces the working medium, which is prone to crevice corrosion

Images