Method and device for liquefying natural gas by using propylene precooling mixed cryogen

A liquefied natural gas and mixed refrigerant technology, applied in refrigeration and liquefaction, liquefaction, gas fuel and other directions, can solve the problems of clogging pipelines and equipment, affecting the normal operation of the main refrigeration cycle, etc., to achieve convenient operation, high energy consumption utilization, The effect of improving the extraction effect
CN102304403AActive Publication Date: 2012-01-04CHENGDU SEPMEM SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU SEPMEM SCI & TECH
Publication Date
2012-01-04

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Abstract

The invention provides a method and a device for liquefying natural gas by using a propylene precooling mixed cryogen, aiming at solving the problems that a heavy hydrocarbon component needs to be added in a natural gas precooling cryogen for ensuring cooling effect when propane is used as the natural gas precooling cryogen so as to result in that pipelines and equipment are blocked and normal circulation operation is influenced. According to the invention, propylene is adopted to replace propane to be used as the precooling cryogen in a natural gas liquefying process with a mixed cryogen, and the precooling effects of the natural gas and mixed cryogen are improved through changing process flow, thereby obviously reducing energy consumption and simplifying liquefication flow equipment andoperation.
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Description

technical field

[0001] The invention belongs to the technical field of liquefaction of natural gas, coal bed methane or other methane-rich gases, in particular to a method and device for liquefying natural gas with propylene precooling mixed refrigerant. Background technique

[0002] As early as the 1930s, Porter Nickel of the United States proposed a mixed refrigerant liquefaction process. Although this process can reduce equipment, simplify the process, and save fixed cost investment, the single use of single-stage mixed refrigerant liquefied natural gas has a lower energy efficiency utilization rate than cascade cycle refrigeration, and the corresponding technology is not mature. Therefore, before the 1970s, large-scale liquefaction devices worldwide were still dominated by cascade circulation.

[0003] In 1970, Lee S.Gaumer and Charles L.Newton of APCI Corporation of the United States proposed a system and method combining cascade cycle and single-stage mixed refrigeran...

Claims

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