Gas integral heat treating method and device for large-scale pressure container

Abstract

A integral heat treatment method of a large pressurized vessel gas, laminated-heating pressurized vessel using plural gas combustors, includes: plural gas combustors for laminated-heating pressurized vessel; an air feed apparatus for providing steady gas source for gas combustors; a guide apparatus for guiding the airflow of the burning gas; an thermometric apparatus for measuring in real time and copying the temperature of each part of the pressurized vessel; A flue apparatus for adjusting in real time the inner pressure of pressurized vessel, a autocontrol apparatus for controlling in real time the output of the gas combustors. The mothod of the invention has good heating power, good internal hot recycle, high autocontrol precision, the quality of integral heat treatment of pressurized vessel is assured. The effect of service performance of the weld joint by the sulfide in the burning process can be effectively reduced using a gas with low-sulfur as a fuel, while it satisfies the special requirement of integral heat treatment after welding a large pressurized vessel in petroleum and chemical industry.

Description

Technical field: [0001] The invention relates to an overall heat treatment method and device for metal containers, in particular to a method and device for overall heat treatment of a large pressure vessel by using a gas method. Background technique: [0002] Large pressure vessels refer to pressure vessels that need to be manufactured (assembled and welded) on site due to equipment weight or transportation road restrictions. With the development of the petrochemical industry, various chemical steel towers and containers tend to become larger and larger. For example, the diameter of the acrylonitrile reactor is nearly 9 meters, and the height reaches about 30 meters. The overall post-weld heat treatment of such a large pressure vessel has become a technical problem to be solved urgently. [0003] At present, there are two commonly used heat treatment technologies for pressure vessels: electric heating method and fuel oil method, and there are technical defects in different ...

AI Technical Summary

Problems solved by technology

When the overall heat treatment of the electric heating method is used, the power consumption is quite large, and the construction site cannot satisfy it at all. In addition, the construction cost is high and the construction period is long, which is not suitable for the overall heat treatment of large pressure vessels after welding (the usual method is to heat treat in sections first, and then heat treatment to the large pressure vessel. local heat treatment for the welds between each section); when using the fuel oil method for overall heat treatment, it can usually provide enough heat, but because the heat is too concentrated, and the tower type pressure vessel often has poor internal heat cycle effect due to its structure, which is not conducive to The uniform distribution of heat in the container, so when applied to the overall heat treatment of large pressure vessels, there are technical difficulties such as large upper and lower temperature differences and local temperature hysteresis, resulting in low heat treatment quality

In addition, due to the high sulfur content in light diesel fuel used in the fuel oil method, the sulfide produced during the combustion process will affect the performance of welded joints. The overall heat treatment clearly requires that the fuel oil method should not be used, which also limits the further application and improvement of this method in pressure vessels

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