In-situ piecewise heat treatment method of large pressure container

Abstract

The invention discloses an in-situ piecewise heat treatment method of a large pressure container, which comprises the following steps: respectively setting an inner cavity of each section of pressure container cylinder body of the large pressure container being installed and constructed into a hearth; starting from the bottom section, performing the heat treatment on one section of pressure container cylinder body when installing and constructing the section of pressure container cylinder body; and installing and constructing one section of pressure container cylinder body on the heat-treated section of pressure container, and performing the heat treatment on the former section of pressure container cylinder body until the heat treatment is performed on the installed and constructed highest section of pressure cylinder body. The invention can save the step of heat treatment on a welding circular seam by using an electric heater.

Description

technical field [0001] The invention relates to a post-weld heat treatment technology, in particular to a method for section-by-section heat treatment of a large pressure vessel, or a method for section-by-section heat treatment of a large pressure vessel being installed. Background technique [0002] Post-weld heat treatment of pressure vessels is the last key process in the manufacturing process of pressure vessels. The quality of post-weld heat treatment directly affects the overall internal quality of the pressure vessel. Unlike weld defects, post-weld heat treatment cannot be reworked, and the heat treatment takes a long time and costs a lot. The effect of post-weld heat treatment is guaranteed by the post-weld heat treatment process. Therefore, faithfully implementing the post-weld heat treatment process is the key to ensuring the effect of post-weld heat treatment. The uniformity of heat treatment temperature, the rationality of holding time, and the accuracy of temp...

AI Technical Summary

Problems solved by technology

Due to the large volume of welded large pressure vessels, figure 1 The traditional heat treatment methods shown do not allow for the overall heat treatment of such large vessels, and section-by-section heat treatment is a good and practical approach

[0005] If the pressure vessel is sent into figure 1 The heat treatment is carried out in the industrial furnace 10 shown, and the pressure vessel section needs to be placed on the trolley and sent into the industrial furnace 10 through the furnace door of the industrial furnace 10, and the workload is very large

In addition, this is a horizontal heat treatment method. Due to the large volume and weight of large pressure vessels, the horizontal pressure vessel is very easy to deform during heat treatment.

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