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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 reducing production costs

Active Publication Date: 2013-07-24
CHENGDU SEPMEM SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high boiling point and freezing point of heavy hydrocarbon components such as C4 and C5, when the temperature of natural gas liquefaction reaches -162°C, heavy hydrocarbon components will form solids, which will seriously block pipelines and equipment, and affect the normal operation of the main refrigeration cycle

Method used

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

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Embodiment 1

[0033] The device used in this embodiment is as figure 1 As shown, it includes a precooling circulation system, a cryogenic circulation system and a natural gas liquefaction system. The precooling circulation system is composed of a precooling compressor 101, a precooling water cooler 102, an auxiliary cooling box 2, and a first precooling agent throttle valve 103. 1. The first gas-liquid separator 105 forms a closed circulation system through pipelines;

[0034] The cryogenic cycle system is a closed refrigeration cycle system formed by a cryogenic cycle compressor 201, a cryogenic water cooler 202, an auxiliary cold box 2, a main cold box 3, and a cryogenic throttle valve 204 through pipelines;

[0035] Among them, the auxiliary cold box 2, the main cold box 3 and the natural gas throttle valve 4 are connected through natural gas inlet and outlet pipelines to form a natural gas liquefaction system.

[0036] The pre-cooling refrigerant used in the pre-cooling circulation sys...

Embodiment 2

[0044] The device used in this embodiment is as figure 2 As shown, it includes a precooling circulation system, a cryogenic circulation system and a natural gas liquefaction system. The precooling circulation system is composed of a precooling compressor 101, a precooling water cooler 102, an auxiliary cooling box 2, and a first precooling agent throttle valve 103. , the first gas-liquid separator 105, the second precoolant throttle valve 113, and the second gas-liquid separator 115 form a closed circulation system through pipelines;

[0045] The cryogenic cycle system is a closed refrigeration cycle system formed by a cryogenic cycle compressor 201, a cryogenic water cooler 202, an auxiliary cold box 2, a main cold box 3, and a cryogenic throttle valve 204 through pipelines;

[0046] Among them, the auxiliary cold box 2, the main cold box 3 and the natural gas throttle valve 4 are connected through natural gas inlet and outlet pipelines to form a natural gas liquefaction sys...

Embodiment 3

[0056] The device used in this embodiment is as image 3 As shown, it includes a precooling circulation system, a cryogenic circulation system and a natural gas liquefaction system. The precooling circulation system is composed of a precooling compressor 101, a precooling water cooler 102, an auxiliary cooling box 2, and a first precooling agent throttle valve 103. , the first gas-liquid separator 105, the second precoolant throttle valve 113, the second gas-liquid separator 115, the third precoolant throttle valve 123, the third gas-liquid separator 125, the fourth precoolant The throttle valve 133 and the fourth gas-liquid separator 135 form a closed circulation system through pipelines;

[0057] The cryogenic cycle system is a closed refrigeration cycle system formed by a cryogenic cycle compressor 201, a cryogenic water cooler 202, an auxiliary cold box 2, a main cold box 3, and a cryogenic throttle valve 204 through pipelines;

[0058] Among them, the auxiliary cold box ...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10
CPCF25J1/0055F25J1/0022F25J1/0052F25J1/0087F25J1/0216F25J1/0292F25J2220/64
Inventor 张惊涛母斌杨勇刚
Owner CHENGDU SEPMEM SCI & TECH
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