A pillar moving method in the overall heat treatment process of a large spherical tank

Abstract

The invention particularly relates to a brace moving method used in a whole heat treatment process of a large spherical tank. The brace moving method comprises the following steps of firstly, determining brace calculation friction forces of various braces for supporting the spherical tank; secondly, calculating displacement when the sum of primary stress and secondary stress in the spherical tank reaches allowable limitation under the conditions of different friction forces and different temperatures of the bottoms of the braces; thirdly, substituting an obtained brace calculation friction force f' into a result obtained in the second step to obtain a corresponding relation between the brace calculation friction force f' and the displacement of the bottoms of the braces; and finally, moving the various braces in the whole heat treatment process according to the corresponding relation between the brace calculation friction force f' and the displacement of the bottoms of the braces. According to the brace moving method used in the whole heat treatment process of the large spherical tank, finite element numerical values in the whole heat treatment process of the large spherical tank can be calculated in an analog manner, and the safety of the whole heat treatment process is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of pillar movement of large spherical tanks, and in particular relates to a pillar moving method in the overall heat treatment process of large spherical tanks. Background technique [0002] During the welding manufacturing process of the spherical tank, the cooling shrinkage of the weld metal and the uneven heating and cooling of the entire welding area will generate a large residual stress near the weld, sometimes even reaching the level of yield stress. In this case, if the storage medium in the spherical tank contains corrosive medium or the steel used in the spherical tank has a tendency to delay cracks, cracks will easily form in the weld area during the use of the spherical tank, which will greatly shorten the service life of the spherical tank , and may cause environmental and personal injury. [0003] Studies have shown that effective post-weld heat treatment can greatly reduce welding residual str...

AI Technical Summary

Problems solved by technology

[0005] Large-scale spherical tanks are heavy, and it is difficult to control manufacturing errors, and the experience in heat treatment is extremely lacking. During the heat treatment process of spherical tanks, as the temperature rises, the physical properties of materials decrease, and the spherical tank is likely to be under its own gravity. , pillar friction, and temperature difference produce damage

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