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Rectifying type variation-concentration self-overlaying gas liquefaction system

A variable concentration, self-cascading technology, applied in refrigeration and liquefaction, fluid circulation arrangements, irreversible cycle compressors, etc., can solve the problem of high compressor pressure ratio and exhaust temperature, shortened compressor life, and refrigeration system paralysis, etc. problems, to achieve the effect of improving the exhaust temperature, reducing the pressure ratio, and reducing the unit liquefaction work

Active Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the liquefaction system to start to cool down, the pressure ratio of the compressor and the exhaust temperature will be too high, which will greatly reduce the life of the compressor and even cause the compressor to fail to start due to pressure protection, causing the entire refrigeration system to be paralyzed and unable to operate normally. Low

Method used

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  • Rectifying type variation-concentration self-overlaying gas liquefaction system
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  • Rectifying type variation-concentration self-overlaying gas liquefaction system

Examples

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Embodiment 1

[0029] Such as figure 1As shown, a rectification-type variable concentration self-cascading gas liquefaction system includes four parts: the normal concentration circuit, the first variable concentration circuit, the second variable concentration circuit and the feed gas liquefaction circuit. The following describes each circuit in detail illustrate.

[0030] (1) Normal concentration circuit:

[0031] The normal concentration circuit includes compressor 1, condenser 2, rectification device 3, first heat exchanger 6, second heat exchanger 7, third heat exchanger 8, first throttling element 9, second throttling element 10. The third throttling element 11 , the fourth throttling element 12 , the fifth throttling element 13 , the sixth throttling element 14 , and the seventh throttling element 15 . The rectification device 3 includes a rectification tower and a tower top heat exchanger communicated with the top of the rectification section of the rectification tower. Both the f...

Embodiment 2

[0061] Such as figure 2 As shown, the structure and connection method are the same as those of the embodiment, except that a dry filter is provided between the bottom of the rectification tower and the fifth throttling element 13 or the sixth throttling element 14 or the seventh throttling element 15 4 and tank bottom heat exchanger 5. Wherein, the liquid outlet 3b at the bottom of the rectifying tower of the rectifying device 3 is first connected with the feed port 4a of the dry filter 4, and the discharge port 4b of the dry filter 4 is respectively connected with two branches arranged in parallel, wherein One branch is connected with the feed port 22a of the third shut-off valve 22, and the other branch is connected with the inlet end 5a of one of the pipes in the bottom heat exchanger 5, and the outlet end 5b of the pipe is respectively connected with the fifth The feed port of the throttling element 13 or the sixth throttling element 14 or the seventh throttling element ...

Embodiment 3

[0064] Such as image 3 As shown, the structure and connection method are the same as those of Embodiment 1, the difference is that: on the pipeline between the inlet of the first throttling element 9 and the outlet end of the refrigerant pipeline of the second heat exchanger 7, a A gas-liquid separator 16; a third variable concentration circuit is provided between the gas-liquid separator 16 and the suction port of the compressor 1; the third variable concentration circuit is composed of the fifth cut-off valve 24, the second gas storage circuit connected in series successively The tank 19 and the sixth stop valve 25 are composed; wherein, the feed port of the fifth stop valve 24 is communicated with the gas section of the gas-liquid separator 16 inner cavity, and the discharge port 24b is connected with the feed port of the second gas storage tank 19; The feed port 25a of the sixth cut-off valve 25 is connected with the discharge port of the second gas storage tank 19 , and ...

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Abstract

The invention discloses a rectifying type variation-concentration self-overlaying gas liquefaction system which comprises a compressor, a condenser, a rectifying device and a feed gas liquefaction loop, wherein the feed gas liquefaction loop comprises a first heat exchanger group, a second heat exchanger group and a first throttle valve arranged between the first heat exchanger group and the second heat exchanger group; and two parallel arranged first variable concentration loop and second variable concentration loop are arranged between the rectifying device and an air suction hole of the compressor. The rectifying device is used for replacing a multistage separation process of the traditional mixed refrigerant gas liquefaction system, and different components of high-pressure liquids are led from the bottom and the top of the rectifying device and are respectively subjected to pressure reduction and then enter the two heat exchanger groups, water equivalent change of a feed gas cooling and liquefaction process is optimized and matched, and variable working condition regulating capacity of the liquefaction system is improved by adopting the variable concentration loops. The invention has the advantages of simple structure, operation reliability, high system liquefaction efficiency and the like, and is suitable for various small and minitype gas liquefaction systems with high performance requirements on variable working conditions.

Description

technical field [0001] The invention belongs to the technical field of gas liquefaction systems, in particular to a rectification type variable concentration self-cascading gas liquefaction system. Background technique [0002] In large-scale natural gas liquefaction projects, the mixed refrigerant self-cascade gas liquefaction system has replaced the classic cascade gas liquefaction system and has been widely used. However, since these traditional mixed refrigerant gas liquefaction systems adopt a 2-5 stage equilibrium separation and segregation process, the treatment of lubricating oil has been greatly improved, but the structure of the cycle has become correspondingly complicated, and the operation process has a great impact on The adaptability of air source and ambient temperature becomes poor and difficult to control. Especially for small and micro gas liquefaction devices, simplicity of equipment is a very important determining factor, and the above-mentioned traditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B41/04F25B1/00
Inventor 王勤王江浦陈光明张爱民陈福胜
Owner ZHEJIANG UNIV
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