Multi-element mixed work medium condensating, separating, throttling and oleep cooling circular refrigeration system

Abstract

The multi-component mixed working medium segregation, separation, throttling and throttling cryogenic refrigeration cycle system involved in the present invention includes a compressor, an intermediate refrigeration and an evaporator module; the compressor module is composed of a compressor, a front cooler and a filter oil return device; the intermediate refrigeration module It consists of multi-stage mixed working medium refrigeration sub-modules, each sub-module includes a decondensation separator, a throttling element and a counterflow heat exchanger; the evaporator module includes a throttling element, an evaporator and a counterflow heat exchanger; the refrigerator adopts a high-efficiency Multi-component non-azeotropic mixed working fluid, no environmental hazards, driven by a single compressor, simple and reliable, multi-component mixed working fluid internal cascade refrigeration, reliable performance of the refrigerator, high refrigeration efficiency.

Description

field of invention [0001] The invention relates to a refrigerator in the technical field of refrigeration and low temperature, in particular to a multi-component mixed working medium separation, separation, throttling, and throttling cryogenic refrigeration cycle system. Background technique [0002] The multi-element low-temperature mixed refrigerant primary throttling refrigerator developed in recent years is composed of a compressor, a cooler, a counterflow heat exchanger, an evaporator, and throttling elements. It has a simple structure, low cost, and relatively high thermal efficiency. However, due to the use of multiple non-azeotropic working fluids as the refrigerant, the temperature of the evaporator has a large slippage, and due to a throttling cycle, the lubricating oil carried by the refrigerant fluid enters the low-temperature end of the refrigerator, which is likely to cause blockage of the throttling element and low-temperature end heat exchangers and evaporato...

AI Technical Summary

Problems solved by technology

Compared with the primary throttling cycle refrigerator mentioned above, the internal cascade cycle refrigerator has a certain improvement in reliability, but its structure becomes complicated and not suitable for small devices, and because the gas-liquid separation is The flash separation under isothermal and isobaric conditions based on the phase equilibrium characteristics of zeotropic mixtures requires a mechanical separation method to separate the liquid phase from the high-pressure fluid at the separation point and throttle it back to the low-pressure channel. The separated liquid composition is the composition of the liquid phase in phase equilibrium at the separation point, and the separation result is determined by the temperature at the separation point and the phase equilibrium characteristics of the working medium (the temperature of the separated gas-liquid two-phase is equal), if the boiling points of adjacent components in the working medium are compared Close, there will be two problems, one is that the separation of high boiling point components is not thorough enough, there will still be more content into the next stage, and the other is that too much separation of components in the middle temperature zone will reduce the efficiency of the next stage and cause refrigeration The efficiency of the whole machine decreases; at the same time, the separation efficiency of the mechanical separation method is low, and the formed liquid cannot be completely separated

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