Device and method for fixing drain pipe in nuclear power steam generator

Abstract

The invention discloses a device and method for fixing a drain pipe in a nuclear power steam generator. The fixing device comprises an annular plate (1), a connecting shaft (2), a locking bolt (3), a hook-shaped plate (4) and a ratchet wheel assembly (5). According to the fixing device and method, the drain pipe (6) can be completely fixed on the inner side of a channel pipe (7) through multiple sets of hook-shaped plates (4), relative fixing and accurate positioning of the drain pipe (6) and the channel pipe (7) are always kept in the multi-degree-of-freedom movement process of the drain pipe (6) along with lifting, overturning, rotating and the like of a separator, universality is high, the design is flexible, and the operation is simple.

Description

technical field [0001] The invention relates to the field of pipeline installation, in particular to a pipeline installation inside pressure vessel equipment, and in particular to a device for temporarily fixing internal drain pipes of nuclear power steam generators in separator channel 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 "going global", in terms of design innovation, "Hualong One" puts forward the safety design con...

AI Technical Summary

Problems solved by technology

This improvement makes the internal layout more reasonable and increases the rising rate of steam. However, from the manufacturing point of view, the optimized drain pipe cannot be introduced from the bottom side of the separator according to the original process. The drain pipe is introduced into the channel pipe, and after adjusting the height of all the drain pipes in the separator and the angle of the elbow end, fix them in the separator, and then turn the separator with the installed drain pipe upside down and install it into the steam generator

[0006] However, at present, there are still the following difficulties in pre-setting the drain pipe in the separator: 1. The drain pipe must be axially fixed in the channel pipe of the separator before the separator turns over, otherwise it will slide down with its own weight during the flip; 2. The length of the drain pipe is about 3m, The weight is up to 100kg, and it needs to be fixed radially in the channel tubes of various specifications and shapes, otherwise the drain tube will shake and bump inside the channel tube during the turning process, causing damage to the parts; 3. The joint between the elbow end of the drain tube and the dryer There are strict size requirements. When the drain pipe is introduced into the separator channel pipe, the height and angle should be adjusted properly, so that after the separator is installed in a reasonable position, the drain pipe should be in a suitable docking position with the dryer, and the drain pipe is in the process of turning over. Because the elbow end is in an eccentric state, it will rotate, which will affect the accuracy of the docking position

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