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Liquid nitrogen decompression low-temperature cooling system

A cooling system, liquid nitrogen technology, applied in refrigerators, refrigeration and liquefaction, machines using refrigerant evaporation, etc., can solve problems such as boiling and low temperature in the first stage of compressors, so as to increase inlet temperature, improve performance, Effect of reducing the risk of deterioration

Active Publication Date: 2019-11-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to avoid the temperature of the first stage of the compressor being too low, and avoiding the excessive heat transfer temperature difference leading to film boiling

Method used

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Embodiment 1

[0032] like figure 1 As shown, the liquid nitrogen decompression and low temperature cooling system provided in this embodiment includes a negative pressure liquid nitrogen storage tank 1, a first heat exchanger 2, a first centrifugal compressor 3, a second heat exchanger 4, a second centrifugal compressor The machine 5, the third centrifugal compressor 6, the gas injector 7, the normal pressure liquid nitrogen storage tank 8 and the pipeline, all components are connected through the pipeline to form a gas path.

[0033]The first centrifugal compressor 3 , the second centrifugal compressor 5 and the third centrifugal compressor 6 respectively constitute the first stage, the second stage and the third stage of the centrifugal compressor assembly.

[0034] Both the first heat exchanger 2 and the second heat exchanger 4 adopt a multi-channel structure, and the gas outlet of the negative pressure liquid nitrogen storage tank 1 communicates with the gas inlet of the first centrifug...

Embodiment 2

[0037] In this embodiment, the liquid nitrogen depressurization and cryogenic cooling system in Embodiment 1 is used to supercool the atmospheric pressure liquid oxygen.

[0038] like figure 2 As shown, on the basis of Embodiment 1, this embodiment adds a liquid oxygen storage tank 10 and a liquid oxygen pump 9, and uses the liquid nitrogen cooled by the present invention to supercool the liquid oxygen at atmospheric pressure. The atmospheric pressure liquid oxygen in the liquid oxygen storage tank 10 has a temperature of 90K and is extracted from the upper layer of the liquid oxygen storage tank 10 under the action of the liquid oxygen pump 9 . The liquid oxygen after passing through the liquid oxygen pump 9 passes through the heat exchanger in the normal pressure liquid nitrogen storage tank 8 at first, the liquid nitrogen pressure of the normal pressure liquid nitrogen storage tank 8 is 0.101MPa, and the temperature is 77K. In this heat exchanger, liquid oxygen flows on t...

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Abstract

The invention discloses a liquid nitrogen decompression low-temperature cooling system, and relates to the technical field of low temperature. The liquid nitrogen decompression low-temperature coolingsystem comprises a negative-pressure liquid nitrogen storage tank, a normal-pressure liquid nitrogen storage tank, a centrifugal compressor set and a heat exchanger; the centrifugal compressor set comprises a centrifugal compressor, the heat exchanger is arranged at a gas inlet of the centrifugal compressor, and a gas outlet of the negative-pressure liquid nitrogen storage tank communicates witha gas inlet of a first stage of the centrifugal compressor through the heat exchanger; and the gas temperature of a low-temperature gas outlet of the heat exchanger is higher than that of an inlet ofthe heat exchanger. The refrigerating system further comprises a gas ejector, and the first inlet of the gas ejector communicates with the last stage of the centrifugal compressor; the normal-pressureliquid nitrogen storage tank is connected with a second inlet of the gas ejector after passing through the heat exchanger; and the gas in the normal-pressure liquid nitrogen storage tank is ejected through the air flow of the first inlet by means of the pressure difference, and the gas is discharged into the air. According to the liquid nitrogen decompression low-temperature cooling system, the low-temperature liquid nitrogen in the negative pressure state is effectively obtained; and meanwhile, the pressure of the gas conservator of the normal-pressure liquid nitrogen storage tank is controlled, and the performance of the system is improved by utilizing the heat and pressure generated by the compressor.

Description

technical field [0001] The invention relates to the field of low-temperature technology, in particular to a liquid nitrogen decompression and low-temperature cooling system. Background technique [0002] The cooling capacity of cryogenic liquids is a good cooling source, such as liquid oxygen, liquid nitrogen, liquid hydrogen, liquid methane, etc., especially liquid nitrogen, which is cheap and safe as a cooling medium. However, under atmospheric pressure, the evaporation temperature of liquid nitrogen is 77K, which is relatively high and cannot meet the cooling requirements of some working conditions. In order to obtain a lower temperature, the supercooled liquid nitrogen cooling system is widely used at home and abroad. [0003] The supercooled liquid nitrogen cooling system is divided into two types according to the different cold sources: the first is a closed supercooled liquid nitrogen cooling system with a small cryogenic refrigerator as the cold source; the other is...

Claims

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Application Information

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IPC IPC(8): F25B19/02
CPCF25B19/005F25B19/02
Inventor 徐笑影汪彬任枫罗云余欣黄欣培张浩张亮王文
Owner SHANGHAI JIAO TONG UNIV
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