Multiple pressure grade mixed working medium cryogenic throttling refrigeration system

Abstract

The multiple pressure stage mixed work medium cryogenic throttling refrigeration system consists of several stages of compressor set unit MCPU, back heating pre-cooling unit MRU and evaporator unit EVU. The connection mode includes connecting the high pressure outlet of MCPU to the high pressure inlet of MRU, connecting the low pressure inlet of MCPU to the low pressure outlet one MRU, connecting the high pressure outlet operate MRU to the inlet of EVU, and connecting the outlet of EVU to the low pressure inlet of MRU. The present invention adopts high efficiency multiple-element mixed work medium. The refrigeration system has lowered irreversible loss of compression and back heating process thermodynamically, reduced loss in the practical flow and heat exchange process, and thus high thermodynamic efficiency, and is especially suitable for large and middle scale low temperature refrigerating and gas liquefying fields.

Description

technical field [0001] The invention relates to the field of low-temperature refrigeration technology and gas liquefaction, in particular to a cryogenic throttling refrigeration system with multi-pressure stage mixed working medium. Background technique [0002] The cryogenic multi-component mixed working medium throttling refrigerator with heat recovery measures is widely used in the fields of energy, chemical industry and cryogenic engineering to realize device cooling and liquefaction of industrial gases. Among them, the application in the field of liquefied natural gas is the mixed working medium One of the most important manifestations of throttling refrigeration technology. The use of multiple mixtures of working fluids provides more freedom of choice in the design and operation of the refrigerator. Therefore, according to different cooling objects and application requirements, various refrigeration process systems have emerged, and there are no less than dozens of pr...

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Problems solved by technology

[0006] In addition, in order to achieve 210-230K refrigeration in the field of general cooling, two-stage compression and two-stage throttling refrigeration cycles are often used (Li Songshou et al., Refrigeration Principles and Equipment, Shanghai Science and Technology Press, 1988, pp.57-59), mainly The purpose is to solve the problem of excessive pressure ratio of the compressor when achieving low temperature

In addition, there are also two throttling cycles in the field of cryogenics (Chen Guobang et al., Machinery Industry Press, 1994, pp.328-329). Pure working fluid is used to reduce the temperature before the last stage of throttling, but the last stage of throttling The pressure before the flow has been throttled once, so that the pressure difference before and after the throttling is reduced, which will reduce the isothermal throttling effect of the unit flow rate

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