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

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...

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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 lubricating oil, and HFC and FC substances with higher boiling points have higher freezing point temperatures, and their mixed refrigerants have poor low-temperature oil solubility, so the above-mentioned non-flammable Mixed refrigerants are generally used in multi-stage automatic cascade refrigeration systems

In the adopted system, a multi-stage vapor-liquid separation device is usually set up to separate lubricating oil and components with high freezing point temperature in a higher temperature area to ensure the normal operation of the system, which obviously increases the complexity of the system

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