Integral replacement and hoisting method for steam generators in active nuclear power plants

Abstract

The invention discloses an integral replacing and hoisting method of a steam generator of an in-service nuclear power plant. According to the method, two hydraulic lifting devices arranged on a nuclear island loop bridge crane main girder are used, so that air turning and installation or detachment of the steam generator are achieved through hoisting. Compared with the prior art, the integral replacing and hoisting method of the steam generator of the in-service nuclear power plant does not need installation and detachment work of a turning embracing ring, a turning support and the like, and therefore work efficiency of replacement of the steam generator can be effectively improved. Due to the fact that the steam generator can be turned in the air, erecting and placement of the steam generator can be further achieved by means of space in a room, and the requirements for work space of replacement of the steam generator are effectively lowered. Meanwhile, the hydraulic lifting devices have the advantages of being compact in structure and strong in lifting performance, so that safety of hoisting is effectively improved.

Description

technical field [0001] The invention relates to the overall replacement of steam generators in active nuclear power plants, more specifically, the invention relates to a hoisting method for the overall replacement of steam generators in active nuclear power plants. Background technique [0002] In many nuclear power plants, the steam generator is a large-scale heat exchanger, which transfers heat energy through the reactor coolant of the primary loop of the nuclear island and the water of the secondary loop, and generates enough steam in the secondary loop to drive the steam turbine to generate electricity. The function of letting the primary circuit coolant containing radioactive substances flow into the secondary circuit. Each reactor in a nuclear power plant generally has 2 to 6 steam generators, and some have up to 12 steam generators. [0003] The steam generator is composed of a shell and thousands of heat transfer tubes. During the development of nuclear power plants...

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Problems solved by technology

[0005] First, regardless of dismantling or installing the steam generator, it is necessary to install auxiliary tools such as flip rings and flip brackets before flipping, and remove them after flipping. Not only is the process complicated and the workload is heavy, but the critical path requires a long construction period. , the extension of the construction period will not only directly affect the operating efficiency of the nuclear power plant, but will also face a greater impact of nuclear radiation;

[0006] Second, the steam generator needs to be flipped to be completely vertical in the nuclear island plant, so the nuclear island plant is required to have enough working space, especially in terms of height, and the space of the active nuclear power plant has no advantage during the construction period, there will be Pipelines and buildings that restrict operations; on the other hand, many major businesses want to upgrade the economic efficiency of nuclear power plants by replacing them with new equipment or technological transformation, and existing technologies will limit such technological improvements;

[0007] Third, use a mechanical transmission ring crane trolley, and two trolleys need to be hoisted together through a balance beam. Due to the large size and weight of the trolley, the load rate during hoisting is high, which also means The risk is high; in addition, the upgrade or technical transformation of the steam generator will lead to an increase in the size and weight of the equipment, especially a significant increase in the weight of the equipment, and the existing technology will limit the technical improvement of the new equipment

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