A mixed refrigerant suitable for 120k ~ 150k cryogenic temperature zone

Abstract

The present invention relates to providing a mixed refrigerant suitable for the 120K-150K deep-cooling temperature zone of a single-machine automatic cascade refrigeration system. It is composed of six types of refrigerants, each of which accounts for the total molar concentration: the first type is R740, R728 or two The first type of mixture accounts for 3% to 20%; the second type is R50, R784 or two mixtures, accounting for 5% to 25%; the third type is R14, accounting for 15% to 30%; the fourth type is R23, accounting for 15% to 25%. ; The fifth category is R125, R218, R22, R32 or a mixture of two, three or four of them, accounting for 5% to 15%; the sixth category is R236fa, R123, R124 or two or three of them, accounting for 20%. ~30%. Physical mixing at room temperature, to the corresponding mixed refrigerant, can make the system temperature reach 120K ~ 150K, has good miscibility with lubricating oil, and the ODP value is almost zero. It has the advantages of economy, environmental protection, safety and non-combustibility.

Description

field of invention [0001] The invention belongs to the field of refrigeration systems, and relates to a refrigerant, in particular to a mixed refrigerant suitable for the 120K-150K cryogenic temperature zone of a single-unit automatic cascade refrigeration system. Background technique [0002] In modern refrigeration technology, if you use a compressor to cool to a cryogenic temperature zone of 120K ~ 150K, you usually need to use a three-element or four-element cascade refrigeration method. However, the multi-cascade system is complex, requires more compressors, auxiliary components and control components, has a higher failure rate, and is relatively backward in technology. Therefore, the low temperature technology of 120K ~ 150K will be greatly developed through the stand-alone automatic cascade refrigeration system. [0003] In the prior art, such as the US patent: US5,441,658 and the Chinese patent: CN97,115,295.0 are all applied to the liquid nitrogen temperature zone ...

AI Technical Summary

Problems solved by technology

This mixed refrigerant is applied to a general small-scale refrigeration system, and the flammable refrigerant often exceeds several kilograms. If it is applied to a larger system, the entire system will be a dangerous powder keg. Once it leaks, the consequences will be disastrous.

Images