Local Heat Treatment Method for Large Pressure Vessels
A local heat treatment and pressure vessel technology, applied in the field of heat treatment, can solve problems such as lack of specification requirements, cracking of large insert plates, lack of calculation methods and testing methods, etc.
Active Publication Date: 2020-12-08
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Problems solved by technology
However, due to the lack of reliable calculation methods, available testing methods, and feasible control basis in theory, sometimes large insert plates crack due to excessive deformation of welds, and domestic and foreign design standards have not scientifically resolved
Secondly, for the local heat treatment of large equipment, there is a lack of complete specification requirements
In practice, most equipment manufacturers only carry out local heat treatment, but the actual effect of heat treatment is unknown, without data support and verification
Method used
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Embodiment 1
[0132] The method of the present invention is used to locally heat-treat the butt weld seam between the large insert plate and the cylinder of a super-large pressure vessel manufactured by an equipment manufacturing plant. The thickness of the super-large pressure vessel cylinder is 50mm, the diameter is 40m, and the insert plate is a "circular" insert plate. , thickness 120mm, diameter about 8m. Through the method of the present application, the key process parameters of the local heat treatment of the large insert plate of the super-large pressure vessel are firstly determined, and the heat treatment experiment of the simulated parts is carried out. The simulated parts are assembled and welded with steel plates of the same material and thickness as the actual product to be heat treated, and the heat treatment process adopted is the same as the actual heat treatment structure on site. The heat treatment temperature field obtained by this simulation part is used as the input o...
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The invention provides a partial heat-treatment method for a large pressure vessel. The partial heat-treatment method for the large pressure vessel comprises determination of a heat-treatment implementation scheme and heat-treatment implementation. The determination of the heat-treatment implementation scheme comprises determining a heat-treatment process; conducting numerical simulation; providing theoretical guidance according to the numerical simulation, and taking different measures for harmful hazards generated in the heat-treatment process; and experimentally monitoring key parts and keytime nodes. The heat-treatment implementation comprises (1) before heat treatment, preparation of heat-treatment files, personnel and equipment, smooth transition of a weld surface and cleaning of aweld joint, spot welding and connection of thermocouples, laying and fixing of heating pieces, and in-place fixing of an insulation cotton tool; (2) heat-treatment implementation: setting of a heat-treatment curve, electrification for temperature rise, adjustment of the holding temperature for heat treatment, temperature holding for heat treatment, and cooling; and (3) after heat treatment: exportand storage of heat-treatment data, disassembly of heat-treatment tools, and completion of partial heat treatment of the large pressure vessel.
Description
technical field [0001] The invention relates to the technical field of heat treatment, in particular to a local heat treatment method for a large pressure vessel. Background technique [0002] With the improvement of large-scale equipment manufacturing capabilities in major fields in my country, more and more large-scale pressure vessels are widely used in petrochemical (over-limit towers), energy storage (large oil depots), tunnel drilling (full-section tunnel boring machines) and other fields . For example, in the field of petrochemicals, more than 80% of newly-added refineries have a capacity of more than 10 million tons, and there are many super-large refining projects such as 20 million tons and 40 million tons, which have brought about super-large pressure vessels, and the size has continuously broken the world record. The manufacture and safety of such containers is of great importance. [0003] Due to the limitation of the volume of the heat treatment furnace, large...
Claims
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IPC IPC(8): C21D9/50C21D11/00
CPCC21D9/50C21D11/00
Inventor 蒋文春金强罗云高腾涂善东宴桂珍王刚杨中伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)