Multi-element mixed refrigerant suitable for cryogenic regions of -130 to -180 DEG C

A mixed refrigerant and multi-component technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of mixed refrigerants such as poor low-temperature oil solubility, environmental protection characteristics, and increased system complexity

Active Publication Date: 2012-10-10
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the above analysis, it can be known that in the prior art, cryogenic multi-component non-flammable mixed refrigerants composed of N2, Ar, R14, R23 and other high boiling point substances have been realized, but the high boiling point components in such mixed refrigerants Either substances containing ozone depletion potential (ODP) such as R142b are used, or hydrofluorocarbon substances with high greenhouse effect (GWP) such as R236fa are used, which affect their environmental protection characteristics
In addition, most HFC and FC substances have poor miscibility with lubric

Method used

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  • Multi-element mixed refrigerant suitable for cryogenic regions of -130 to -180 DEG C
  • Multi-element mixed refrigerant suitable for cryogenic regions of -130 to -180 DEG C
  • Multi-element mixed refrigerant suitable for cryogenic regions of -130 to -180 DEG C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0031] Prepare the completely non-flammable or only weakly flammable multi-component mixed refrigerant that operates in the temperature range of -130°C. The minimum heat transfer temperature difference inside the heat exchanger is 1K, the ambient temperature is 35 °C, and the working medium concentration of the multi-component mixed refrigerant is And the performance is shown in the table below:

[0032]

[0033]

Embodiment 4-6

[0034] Example 4-6: Preparation of completely non-flammable or only weakly flammable multi-component mixed refrigerants operating in the temperature range of -150 ° C, the minimum heat transfer temperature difference inside the heat exchanger is 1K, and the ambient temperature is 35 ° C, and its multi-component mixed refrigeration See the following table for the working substance concentration and performance:

[0035]

[0036]

Embodiment 7-9

[0037] Example 7-9: Preparation of completely non-flammable or only weakly flammable multi-component mixed refrigerants operating in the temperature range of -180°C, the minimum heat transfer temperature difference inside the heat exchanger is 1K, and the ambient temperature is 35 °C, and its multi-component mixed refrigeration See the following table for the working substance concentration and performance:

[0038]

[0039]

[0040] In the above embodiments, the regenerative refrigeration system with completely non-flammable or only weakly flammable mixed refrigerants can safely and efficiently realize cooling in the temperature range of -130 to -180°C, which is comparable to the existing cryogenic mixed refrigerants. Compared with it, it is completely non-flammable or only weakly flammable, and has a low overall greenhouse effect and no ozone-depleting effect at all, which has significant advantages.

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Abstract

A multi-element mixed refrigerant suitable for cryogenic regions of -130 to -180 DEG C comprises five groups of substances: 1) the combination of at least two of nitrogen, argon, neon or alkyl; 2) tetrafluoromethane and methane or the combination thereof; 3) trifluoromethane, ethane, ethylene and fluoromethane or the combination of at least two thereof; 4) perfluoropropane, difluoromethane, propane, propylene and hexafluoropropylene or or the combination of at least two thereof; 5) 1,1,1,2,2-perfluoropropane, 1,1,1,2,3,3,3-heptafluoropropane, perfluoro-n-butane, 1,1,2,2-tetrafluoropropane, 1,1,1,2,3,3-hexafluoropropane, 1,1,1,3,3-perfluoropropane, 1,1,1,2,2,3,3,4,4-nonafluorobutane, 1,1,1,2,2,3,3-sevofluorobutane, 1,1,1,2,2,4,4,4-perfluorobutane, 1,1,2,3-perfluoropropane, 1,1,2,2,3-perfluoropropane, 1,1,1,2,3,4,4,4-perfluorobutane and 1,1,1,2,2,3,3,4-perfluorobutane or the combination of at least two thereof. The multi-element mixed refrigerant can achieve refrigeration of -130 to -180 DEG C safely and efficiently, the greenhouse effect is low and no ozone layer is destroyed.

Description

technical field [0001] The invention relates to refrigerants in the technical field of refrigeration and low temperature, in particular to an efficient, safe and environmentally friendly multi-element mixed refrigerant suitable for cryogenic temperatures of -130 to -180°C. Background technique [0002] The cryogenic multi-component mixed working medium throttling refrigerator with heat recovery measures has the advantages of high efficiency, reliability and low manufacturing cost. It is widely used in the fields of energy, chemical industry and low temperature engineering, and is used to realize deep cooling of devices and liquefaction of industrial gases. , such as cryogenic refrigerators, natural gas liquefaction and other fields. In addition to the refrigeration system process and hardware facilities such as compressors and heat exchangers, the most critical part of this refrigeration technology is the multi-component mixed refrigerant. The multi-component mixed refriger...

Claims

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Application Information

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IPC IPC(8): C09K5/04
Inventor 吴剑峰公茂琼董学强沈俊
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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