Multi-element mixed working medium regenerative throttling refrigeration cycle system with condensate separation

Abstract

A multi-element mixed working medium back-heating type throttling and refrigerating circulation system with dephlegmator-separator is composed of a compressor module, a back-heating heat exchanger module, a throttling module, an evaporative heat exchanging module and connecting pipes thereof. A high-pressure outlet of the refrigerating compressor module is connected with a refrigerant high-pressure inlet of the back-heating heat exchanger module, a refrigerant high-pressure outlet of the back-heating heat exchanger module is connected with a refrigerant high-pressure inlet of the throttling module, a refrigerant low-pressure inlet of the throttling module is connected with the evaporative heat exchanging module, an outlet of the evaporative heat exchanging module is connected with a refrigerant low-pressure inlet of the back-heating heat exchanger module, a refrigerant low-pressure outlet of the back-heating heat exchanger module is connected with a low-pressure inlet of the refrigerating compressor module. The back-heating heat exchanger module is composed of dephlegmator-separator sub modules from first stage to fifth stage, and the dephlegmator-separator sub module of any stage is of eight different structures. The system can realize refrigeration of fixed temperature zone at a low temperature effectively, and can also be applicable to fields with complicated load, such as multi-element gas liquefied separation.

Description

[0001] Technology area [0002] The invention relates to a refrigerator in the technical field of refrigeration and low temperature, in particular to a multi-component mixed working medium regenerative throttling refrigeration cycle system with condensate separation. Background technique [0003] Through the continuous development of multiple mixed working fluid throttling refrigeration technology in recent decades, especially in recent years, it has been truly driven by a cheap and reliable oil-lubricated single-stage compressor, and is gradually becoming a new generation of room temperature to liquid nitrogen temperature range with comprehensive advantages. Universal refrigeration technology. At present, there are mainly: multi-component mixed working medium reheating primary throttling refrigeration cycle, mixed working medium internal cascade throttling refrigeration cycle using Kleemenko cycle, and a new type of separated refrigeration cycle represented by multi-component...

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Problems solved by technology

However, it has obvious shortcomings: since all the refrigerant passes through the evaporator, the temperature of the evaporator has a large slippage; if the oil-lubricated compressor is used, the lubricating oil carried by the refrigerant will enter the low-temperature end of the refrigerator, which will easily cause the throttling element The clogging of the low-temperature end heat exchanger and the thermal congestion of the evaporator will cause the operation of the refrigerator to be unstable and the cooling performance will decline over time. machine manufacturing cost, and will reduce the reliability of the refrigerator; the working fluid components used must meet the minimum temperature without solid phase precipitation, and ensure efficient heat recovery under certain working conditions, which will make the component selection The range is significantly reduced, and more components need to be used; in addition, due to the limitation of the physical properties of the working fluid, it is difficult to generally and efficiently meet the applications with complex distributed loads such as multi-component gas liquefaction separation, etc.

However, since the liquid obtained from the separation of the condensate separator is directly throttled and then enters the low-pressure channel described later without further heat recovery, on the one hand, it is difficult to further improve the efficiency of the refrigeration system, and on the other hand, it is not easy to be efficient and universally applicable such as multiple Applications with complex distributed loads such as gas liquefaction separation require

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