Heating device and method for special-shaped connecting pipe

Abstract

The invention discloses a heating device and heating method for a special-shaped connecting pipe. The heating device comprises a heating assembly (1), basket supporting rods (2) and locking devices (3). The heating assembly (1) is divided into three arc-shaped blocks; the three arc-shaped blocks can tightly wrap the outer side of the special-shaped connecting pipe with uneven thickness after beingspliced. According to the heating device and method for the special-shaped connecting pipe of the invention, a plurality of groups of heaters (11) for independently controlling the temperature are adopted for each region with uneven thickness, and the heaters (11) form a heating region together to accurately control the temperature of each region. The heating device is novel in structural design,convenient to install and high in practicability; the heating device and the corresponding heating method have the advantages of wide heating temperature range, uniform heating temperature, controllability for any position and capability of preheating and post-heating.Compared with flame heating, the heating device has high efficiency, saves energy and and improves working environment.

Description

technical field [0001] The invention relates to the field of pressure vessel manufacturing, in particular to the manufacturing field of Hualong No. 1 steam generator designed by China Nuclear Power Design Institute, and in particular to preheating and post-heat treatment of special-shaped connecting pipes during surfacing welding of the inner wall of special-shaped connecting pipes. Background technique [0002] "Hualong One" is a nuclear power research, design, manufacture, construction and operation of China's two major nuclear power companies, China National Nuclear Corporation (CNN, CNNC) and China General Nuclear Power Group (CGN, CGN) for more than 30 years. On the basis of experience, according to the experience feedback of the Fukushima nuclear accident and the latest safety requirements of my country and the world, the advanced mega-kilowatt pressurized water reactor nuclear power technology has been developed. [0003] As the main brand of China's nuclear power "goi...

AI Technical Summary

Problems solved by technology

However, due to the large volume and thick wall thickness of the special-shaped connecting pipe of the "Hualong No. 1" steam generator, the original flame heating method not only has low heating efficiency, but also brings discomfort to the operator due to high ambient temperature, and the flame is easy to burn. equipment, and flame heating is easy to form carbon deposits, which will affect the quality of products

[0005] Because the wall thickness of the head connecting pipe itself is very thick, and the thickest is about 180mm, the thickness near the end of the connecting pipe is only 78mm, and the thickness is very uneven, which may easily cause uneven heating temperature and cannot meet the welding conditions

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