Thermal treatment device of field joint of steel containment of nuclear power plant and thermal treatment method

Abstract

The invention relates to a thermal treatment device of a field joint of a steel containment of a nuclear power plant and a thermal treatment method, belonging to the technical field of construction of the nuclear power plant. The device mainly consists of a main framework (Z-1), heating insulators (Z-2), a traveling mechanism (Z-3), a temperature sensing apparatus (Z-4) and an automatic temperature controller (Z-5). During thermal treatment, the traveling mechanism of the thermal treatment device is supported at the upper edge of a wall plate of the containment and is moved along the upper edge, so that the heating insulators on both sides of the wall plate of the containment are located in a position for clamping the to-be-thermally-treated joint. Then, the temperature sensor is installed at the to-be-thermally-treated joint. After an electric heating apparatus is connected, under the closed loop control of the automatic temperature controller, the joint is heated to a predetermined temperature. According to the invention, the insulating cotton, the electric heating apparatus and the joint are compactly attached, and the joint quality is remarkably improved and the welding period is remarkably shortened by guaranteeing the thermal treatment quality and efficiency.

Description

technical field [0001] The invention relates to a device for installation and welding of steel containment shells of nuclear power plants, in particular to a heat treatment device for installation welds of steel containment shells of nuclear power plants, and provides corresponding heat treatment methods at the same time, belonging to the technical field of nuclear power plant construction. Background technique [0002] As an important part of the passive system, the containment vessel (CV) can effectively prevent the internal pressure of the containment from exceeding the design value and prevent the leakage of radioactive materials under accident conditions. It is one of the important equipment to ensure the safe operation of nuclear power. The steel containment vessel of AP1000 third-generation nuclear power plant is a hermetic steel container, including three parts: bottom head, cylinder body and top head. It is about 3400m, and the groove section is large. Compared with...

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Problems solved by technology

[0005] 1. The flame baking method is cyclical localized centralized heating. Under the objective conditions of large heat dissipation area, the heat treatment of the weld seam using this method cannot achieve uniform distribution and constant heat treatment temperature in the length of the weld seam and thickness direction, and the quality of heat treatment can be improved. There is no guarantee, and it takes a long time to bake to the specified temperature, and consumes a lot of combustible gas

[0006] 2. The simple supporting electric heating method is to repeatedly support and fix the heating block on the weld seam and lay insulation cotton on the heating block. There is a greater risk in quality and low construction efficiency

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