A helium cryogenic system

Abstract

The invention discloses a helium low-temperature system. The helium low-temperature system comprises a liquid nitrogen storage tank, a compression heat exchange module, a multi-flow regenerator unit, a cold box, a throttling valve, a liquid helium Dewar and a helium buffering tank; the compression heat exchange module comprises heat exchangers and cold compressors connected in sequence and arranged alternately; the heat exchangers are arranged in the liquid nitrogen storage tank; and the liquid nitrogen storage tank, the cold compressors and the multi-flow regenerator unit are all arranged in the cold box. The helium low-temperature system uses the liquid nitrogen storage tank and the compression heat exchange module in a liquid nitrogen temperature area for replacing a helium oil spraying screw compressor, a high-precision oil filter system and a low-temperature purifier in a conventional large helium low-temperature system; and the devices are integrated in the cylindrical cold box to improve the compactness of the whole helium low-temperature system, so that the total structural size of a traditional large helium low-temperature system is reduced by about 40%, the maintenance period of the helium low-temperature system is prolonged, the system operation reliability is improved, the maintenance cost is greatly reduced, and the serving of the large helium low-temperature system to the big sciences engineering is facilitated.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a helium cryogenic system. Background technique [0002] The large-scale helium cryogenic refrigeration system using helium as the working fluid was developed along with the development of superconducting technology. Especially in recent years, the construction of major scientific projects such as the Beijing Electron Positron Collider, the ADS Pilot Project of the Chinese Academy of Sciences, and the Beijing Advanced Light Source has driven the progress of large-scale helium cryogenic systems in China. In these large-scale helium cryogenic systems, without exception, helium oil-injected screw compressors, high-precision oil filtration systems, cryogenic helium purifiers, cold boxes, liquid helium Dewars or load systems, and the connections between these devices are used. Connect the tubing. For a single large-scale helium cryogenic system, helium oil-injected...

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Problems solved by technology

And the existence of the helium oil-injected screw compressor, although its exhaust has been filtered and purified multiple times, still makes the lubricating oil vapor unavoidable in the helium cryogenic system, and these vapors will condense in the cryogenic equipment at low temperatures , from the perspective of long-term operation of large scientific projects, a certain period of time (usually 8000 hours of continuous operation) must be passed to maintain and overhaul the large-scale helium cryogenic system, which reduces the reliability of the entire cryogenic system operation

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