Two-stage overlapped refrigeration low-temperature grade mixed refrigerant

Abstract

The invention provides a two-stage overlapped refrigeration low-temperature grade mixed refrigerant, comprising a component 1 and a component 2 which are physically mixed together, wherein the component 1 is ethylene; and the component 2 is one or two of fluoroform and perfluoroethane, the component 1 accounts for 20-95wt%, and the component 2 accounts for 5-80wt%. Because the components comprise a natural work medium (ethylene), the global warming potential (GWP) of the refrigerant is low, and the intersolubility of the refrigerant in lubricating oil at a low temperature is greatly enhanced to ensure that the system reliability is greatly improved, and soluble oil substances such as propane do not need to be additionally added.

Description

【Technical field】

[0001] The invention relates to a mixed refrigerant, in particular to a two-stage cascade refrigeration low-temperature mixed refrigerant. 【Background technique】

[0002] With the improvement of people's living standards, there is more and more demand for refrigeration technology in the temperature range of around -80 °C. This temperature zone refrigeration can be used for active storage of biological materials, low-temperature preservation of deep-sea fish, low-temperature treatment of alloy materials, etc. The two-stage cascade refrigeration cycle is one of the main ways to achieve refrigeration in the -80°C temperature zone. The basic principle of cascade refrigeration is to use the evaporator of a high-temperature refrigeration system to cool the condenser of a low-temperature refrigeration system to achieve a lower refrigeration temperature, and each stage is a complete vapor compression cycle. The evaporation temperature of the first-stage system is...

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