Working substance pair for absorptive thermal cycling system with heat source temperature ranging from 60 to 130 DEG C

Abstract

The invention provides a working substance pair for an absorptive thermal cycling system with heat source temperature ranging from 60 to 130 DEG C. The working substance pair comprises a working substance and an absorbing substance, wherein the working substance is one or the mixture of more than two substances selected from hydrofluoroalkane, fluoro olefin, fluoro-ether, non-substituted alkane or olefin; the absorbing substance is the mixed liquid consisting of 1 to 50% by mass of ionic liquid and 50 to 99% by mass of organic liquid; and the working substance and the absorbing substance are mixed at 20 to 80 DEG C. The working substance pair can overcome the shortcomings of the conventional working substance pair, and has the characteristics of nontoxicity, safety, and environment conservation.

Description

technical field [0001] The invention belongs to the field of new energy technology utilization, and in particular relates to a working substance pair used in an absorption heat cycle system with a heat source temperature between 60°C and 130°C. Background technique [0002] The absorption heat cycle system includes absorption heat pumps, absorption refrigerators, and absorption heat exchangers. It is a cycle system that uses low-grade heat sources to pump heat from low-temperature heat sources to high-temperature heat sources. It mainly uses natural gas, solar energy, geothermal energy, industrial waste heat and waste heat as the driving force. It only needs to consume a small amount of electric energy to achieve the purpose of cooling or heating. It is an effective device for recycling low-temperature heat energy and has energy saving. , The dual role of protecting the environment. [0003] At present, this technique is still not widely used, mainly due to the failure to f...

AI Technical Summary

Problems solved by technology

Lithium bromide / water system may precipitate lithium bromide at low temperature, block pipes, valves, etc., and easily lead to equipment damage and efficiency decline. In this way, the concentration of lithium bromide can only be kept within a certain range, and the degassing range is reduced. Highly corrosive; the ammonia / water system must separate the working product and the absorbing product due to the high vapor pressure of the absorbent water, resulting in a decrease in the overall efficiency. At the same time, ammonia is poisonous, and ammonia water is corrosive to the equipment to a certain extent

[0004] The working substance pairs studied so far have the following disadvantages: 1) The solubility of the working substance in the absorbent is too low; 2) The vapor pressure of the absorbent is too high and volatile; 3) In the entire temperature range studied, the absorption The viscosity of the material is too high or there are problems such as crystallization, which will affect the circulation of the system; 4) There is corrosion to the equipment

However, due to the strong hydrogen bonds and van der Waals forces between anions and cations, the viscosity of ionic liquids at room temperature is usually relatively large, which means higher mass transfer resistance and transport power consumption.