A local heat treatment process optimization and automatic temperature control method for a large pressure vessel

A local heat treatment and process optimization technology, applied in the field of heat treatment, can solve problems such as high labor intensity, high difficulty, and long heating time

Active Publication Date: 2020-11-20
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of high labor intensity, long heating time, and high difficulty in the local heat treatment operation of large pressure vessels, the present invention provides a local heat treatment process optimization and automatic temperature control method for large pressure vessels, which optimizes the local heat treatment process and temperature control. Realize the efficiency of heat treatment process while ensuring the smooth progress of heat treatment process

Method used

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  • A local heat treatment process optimization and automatic temperature control method for a large pressure vessel
  • A local heat treatment process optimization and automatic temperature control method for a large pressure vessel
  • A local heat treatment process optimization and automatic temperature control method for a large pressure vessel

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Embodiment example 1

[0115] Heat treatment object: Local heat treatment of the butt weld between the large insert plate and the cylinder of an ultra-large pressure vessel.

[0116] Preparation of heat treatment equipment: temperature measuring thermocouple at the welding seam, temperature controlling thermocouple on the heating plate, thermocouple compensation wire, paperless recorder, temperature control box, temperature multi-channel inspection controller, proportional controller, microcomputer and DCS control system.

[0117] Complete the steps of spot welding of heat treatment thermocouples and their connections, laying and fixing of heating sheets. According to the heat treatment process card, set the heat treatment temperature curve, and use the heat treatment DCS automatic temperature control system to complete the entire post-weld heat treatment process. Figure 4 The actual heat treatment temperature curve is given, and the field application shows that the system has the characteristics ...

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Abstract

The invention relates to the technical field of heat treatment, and provides a large pressure container local heat treatment process optimization and automatic temperature control method. The method comprises the local heat treatment process optimization step and the local heat treatment automatic temperature control step. The local heat treatment process optimization step comprises the substeps of temperature measuring point setting; heating element arranging; thermocouple spot welding and wiring; and auxiliary heating. The local heat treatment automatic temperature control step comprises thesubsteps of selection of a heat treatment device; connection of a heat treatment DCS automatic temperature control system; and heat treatment automatic temperature control. The heat treatment automatic temperature control comprises temperature rise operation; heat treatment heat preservation temperature adjusting and heat treatment heat preservation; after heat preservation is finished, accordingto the heat treatment process card, control of the cooling rate and begging of automatic cooling, and finishing of heat treatment. Accordingly, large pressure container local heat treatment process optimization and automatic temperature control are finished.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a local heat treatment process optimization and automatic temperature control method for a large pressure vessel. Background technique [0002] Local heat treatment is a key link in the manufacture of large pressure vessels. Its function is to eliminate the residual stress in the welding manufacturing process, improve the service life and safety of the vessel, and is of great significance to ensure the long-term service of the vessel. The manufacturing process and on-site conditions of large containers determine that such containers cannot be subjected to integral or segmented heat treatment in the furnace and the overall heat treatment of "self-furnace". At present, local heat treatment is used to eliminate residual stress for most of these containers on site, heating plates are used for heating, temperature control boxes are used for temperature control, and paperless re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/34C21D9/50C21D11/00C21D1/30
CPCC21D1/30C21D1/34C21D9/50C21D11/00C21D2221/00
Inventor 蒋文春金强罗云涂善东晏桂珍王刚杨中伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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