Ammonia-containing mixed refrigerant

Abstract

An ammonia-containing mixed refrigerant is prepared by a component 1, a component 2 and a component 3 through physical mixing, wherein the component 1 is ammonia, and the content is 3-90 wt%; the component 2 is one, two or more of ethane, propane, propylene, iso-butane, butane, 1-butene and isobutene, and the content is 5-80 wt%; the component 3 is one, two or more of iodotrifluoromethane, difluoromethane, 1,1-difluoroethane, 1, 1, 1, 2-tetrafluoroethane, 1, 1, 2, 2-tetrafluoroethane, 1, 1, 1, 2, 3, 3, 3-heptafluoropropane, trans-1, 3, 3, 3-tetrafluoropropylene, 1, 1, 1, 3, 3, 3-hexafluoropropane, 1, 1, 1, 2, 3, 3-hexafluoropropane, 1, 1, 1, 3, 3-perfluoropropane and 1, 1, 2, 2, 3-perfluoropropane, and the content is 1-75wt%. The refrigerant has good intersolubility in lubricating oil, the flammability and the toxicity are low, the ammonia-containing mixed refrigerant can substitute a pure ammonia refrigerant, the structure of a conventional ammonia refrigeration system is simplified, the cost is low, and the economic efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and low temperature, and relates to a refrigerant used therein, in particular to a mixed refrigerant containing natural working substance ammonia. Background technique [0002] Refrigeration technology plays an increasingly important role in people's daily life, technological progress in industrial fields and national defense construction. Traditional chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) refrigerants have been banned or restricted due to damage to the ozone layer, and hydrofluorocarbons (HFCs) and hydrocarbons (HCs) refrigerants as alternative working fluids have There are problems of greenhouse effect and strong flammability respectively, and refrigerant has become a bottleneck restricting the development of the industry. Therefore, the development of new environmentally friendly and efficient green refrigerants is of great significance for reducing greenhouse ga...

AI Technical Summary

Problems solved by technology

[0004] However, ammonia refrigerant also has some problems. It has certain flammability and toxicity; it is incompatible with ordinary mineral-based lubricating oil and PAO lubricating oil, which seriously limits the application of ammonia in small and medium-sized refrigeration systems

In the ammonia refrigeration system, in order to prevent the lubricating oil from depositing on the pipes of the heat exchanger to form an oil film, increase the heat transfer resistance, reduce the effective heat transfer, and reduce the efficiency of the heat exchanger, the ammonia refrigeration system must generally be equipped with high-efficiency oil separation The oil circuit system of the ammonia system is very complicated and the automatic control of the unit is very difficult

Images