A rectification self-cascading refrigeration system with precooling

Abstract

The invention relates to the field of refrigeration technology, and discloses a rectification type self-cascading refrigeration system with pre-cooling, which includes a rectification type self-cascading refrigeration circuit and a pre-cooling circuit; The tower top subcooler, tower top heat exchanger and tank bottom subcooler in the circuit are coupled with the rectification type self-cascading refrigeration circuit to provide cooling capacity for the rectification process and to ensure the stability of the temperature at the top of the rectification device And it is at the target temperature, which ensures the separation effect and oil removal effect of the rectification process, enhances the system's ability to deal with harsh working conditions, and provides subcooling for the two parts of the working fluid at the top of the tower and the bottom of the tank at the same time, reducing the compressor. The suction temperature improves the operating conditions of the compressor, ensures the reliable and stable operation of the system, improves the refrigeration performance coefficient of the system, and reduces the operating cost.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a rectification type self-cascading refrigeration system with precooling. Background technique [0002] With the continuous development of society, practical applications put forward higher and higher requirements for refrigeration technology. In order to meet the demand for lower refrigeration temperature, refrigeration systems of various structures and forms have been continuously proposed for use in cryogenic refrigeration, gas liquefaction and other fields. [0003] In the field of cryogenic refrigeration, mixed working medium self-cascade refrigeration has been widely used. Patent CN102494467A discloses a refrigerated storage tank with two-stage condensate separation and recuperative mixed working medium throttling refrigeration. The refrigeration system used in it uses two gas-liquid separators to realize the high and low boiling point of the mixed working medium. S...

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Problems solved by technology

[0011] The invention aims to solve the problem that the rectifying self-cascading refrigeration system is greatly affected by the external environment and unstable in operation in the prior art, and at the same time avoids adverse effects on its own refrigeration performance, and provides a pre-cooling Rectification type self-cascading refrigeration system, which can provide sufficient and stable cooling capacity for the heat exchanger at the top of the rectification unit, so as to achieve the effect of stabilizing the temperature at the top of the tower and at the target value, and at the same time, the whole system runs stably and the system The cooling coefficient of performance has also been improved

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