A regenerative mixed refrigerant gas liquefaction cycle system

Abstract

A regenerative mixed working-medium refrigerating gas liquefaction cycle system comprises a compressor module, a regenerative heat exchanger module and a throttling module, wherein the compressor module comprises a compressor; the regenerative heat exchanger module comprises a segregation separator, a first regenerative heat exchanger, an intermediate throttling element and a second regenerative heat exchanger; the segregation separator is vertically arranged; and the throttling module comprises a refrigerating system throttling regulation valve group and a raw material throttling regulation valve group. The above regenerative mixed working-medium refrigerating gas liquefaction cycle system has the advantages that due to a more complete regenerative process, a perfect oil return system and the segregation separating technology, a refrigerating process can be driven by a single-unit common oil-lubricated compressor driving system, and then low cost and reliability can be achieved; the cycle process layout is flexible, and the regenerative mixed working-medium refrigerating gas liquefaction cycle system can efficiently and widely adapt to the needs of multi-element gas liquefaction-separation and other application occasions with complex-distribution loads; and the regenerative mixed working-medium refrigerating gas liquefaction cycle system is insensitive to a feed gas working condition, and thus such gases as natural gas and coalbed methane can be liquefied at a relatively low pressure.

Description

technical field [0001] The invention relates to a refrigerator in the technical field of refrigeration and low temperature, in particular to a regenerative mixed refrigerant gas liquefaction circulation system. Background technique [0002] The research on natural gas liquefaction devices is a hot spot in the world. The existing coalbed methane / natural gas liquefaction technologies mainly include the following types, and their technical characteristics and development are briefly introduced as follows: [0003] 1) Cascade cascade liquefaction process: This liquefaction process usually adopts three-stage pure working medium cascade refrigeration (cascade cascade), which are three refrigeration units of propane, ethylene and methane, and cascade cooling step by step to realize natural gas cooling and liquefaction. Among them, three different evaporation pressure levels are adopted in each level of pure working fluid cycle, so that up to nine evaporation temperature platforms ...

AI Technical Summary

Problems solved by technology

However, the traditional MRC liquefaction process technology also has an insurmountable technical problem: the restart process after each shutdown is quite complicated, which not only requires the operation of very professional personnel and the cooperation of a large number of special instruments and equipment, but also is very time-consuming

However, there is currently no special multi-stage compressor available for small liquefaction plants.

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