Rectification type auto-cascade refrigeration system with pre-cooling function

Abstract

The invention relates to the technical field of refrigeration, and discloses a rectification type auto-cascade refrigeration system with a pre-cooling function. The system comprises a rectification type auto-cascade refrigeration loop and a pre-cooling loop, the pre-cooling loop is coupled with the rectification type auto-cascade refrigeration loop into a whole through a tower top subcooler, a tower top heat exchanger and a kettle bottom subcooler in the rectification type auto-cascade refrigeration loop; the cooling capacity is provided for the rectification process; the tower top temperatureof the rectifying device can be kept stable and at a target temperature; a separation effect and an oil removal effect in the rectification process are ensured; the capacity of the system for copingwith severe working conditions is enhanced, the supercooling degree is provided for working media of the tower top and the kettle bottom at the same time, the air suction temperature of a compressor is reduced, the operation working condition of the compressor is improved, reliable and stable system operation is guaranteed, the refrigeration performance coefficient of the system is increased, andthe operation cost is reduced.

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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