Non-combustible mixing refrigerant suitable for deep refrigeration temperature of minus 80 DEG C to minus 100 DEG C

Abstract

The invention relates to a non-combustible mixing refrigerant suitable for deep refrigeration temperature of minus 80 DEG C to minus 100 DEG C. The non-combustible mixing refrigerant comprises five groups of materials, where the first group of material is tetrafluoromethane; the second group of material is trifluoromethane, hexafluoroethane or a mixture of the trifluoromethane and the hexafluoroethane; the third group of material is pentafluoroethane, trifluoroethane, perfluoropropane, difluoromethane or a mixture of two, three or multiple of the pentafluoroethane, the trifluoroethane, the perfluoropropane and the difluoromethane; the fourth group of material is iodotrifluoromethane, 1, 1, 2, 2-tetrafluoroethane, 1,1-difluoroethane, 2, 3, 3, 3-tetrafluoropropene, 1, 3, 3, 3-tetrafluoropropene or a mixture of two, three or multiple of the iodotrifluoromethane, the 1, 1, 2, 2-tetrafluoroethane, the 1,1-difluoroethane, the 2, 3, 3, 3-tetrafluoropropene and the 1, 3, 3, 3-tetrafluoropropene; the fifth group of material is perfluoro-n-butane, 1, 1, 1, 3, 3-perfluoropropane or a mixture of the perfluoro-n-butane and the 1, 1, 1, 3, 3-perfluoropropane; the molar concentrations of the five groups of materials are respectively 25-50%, 15-40%, 10-30%, 5-20% and 10-25%; and the non-combustible mixing refrigerant is safe in a back-heating type throttling refrigeration system, can realize the refrigeration in the temperature range of minus 80 DEG C to minus 100 DEG C and has low whole green house effect without ozone depletion effect.

Description

technical field [0001] The invention relates to a refrigerant in the technical field of refrigeration and low temperature, in particular to a nonflammable mixed refrigerant suitable for cryogenic temperatures of -80 to -100°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-element mixed refrigerant used in the mixed working fluid throttling re...

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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. Refrigerants are generally used in multi-stage automatic cascade refrigeration systems

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