Volumetric combustible gas liquefying device utilizing compression-expansion refrigeration and using method thereof

A compression expansion and liquefaction device technology, which is applied in the fields of energy saving and environmental protection, can solve the problems of cumbersome preparation, lower liquefaction efficiency, and influence on the composition of mixed refrigerants, and achieve the effect of reducing air pollution and transportation costs

Inactive Publication Date: 2017-05-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cascaded natural gas liquefaction process is relatively complicated, with a lot of equipment, it is difficult to meet the requirements of small-scale skid-mounted, and due to the inconvenience of maintenance, this liquefaction process is rarely used at present
Mixed refrigerant The ratio of mixed refrigerant in the natural gas liquefaction process is related to the pressure and composition of the raw gas. It will also have a greater impact on the composition of the mixed refrigerant

Method used

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  • Volumetric combustible gas liquefying device utilizing compression-expansion refrigeration and using method thereof
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  • Volumetric combustible gas liquefying device utilizing compression-expansion refrigeration and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] like figure 1 As shown, the liquefaction device of the present invention is an expansion type liquefaction device with two-stage compression and two-stage expansion of combustible gas; The pretreatment unit 5 removes impurities such as moisture and acid gas in the combustible gas to make it reach the liquefaction standard. The purified combustible gas enters the combustible gas compression unit 6 for compression and cooling. The compression unit is composed of two compressors 6-1 and 6-5. The pinch point temperature difference in the heat exchanger 3, the ambient temperature, and the isentropic efficiency of the expander vary), and then enter the multi-stream heat exchanger 3 for heat exchange, and the temperature drops to -110°C, and then drops through the throttling device 7 When the pressure reaches 2MPa, the combustible gas has been completely liquefied, and finally enters the liquefied combustible gas storage tank 8 for storage and is ready to be shipped.

[0065...

Embodiment 2

[0068] like figure 2 As shown, the liquefaction device of the present invention is an expansion type liquefaction device with two-stage compression, two-stage expansion, and one-stage compression of combustible gas. 6-1 and 6-5 become one-stage compression 6-1, which is applicable to the situation where the initial pressure of combustible gas is relatively high.

Embodiment 3

[0070] like image 3 As shown, the liquefaction device of the present invention is an expansion type liquefaction device with two-stage compression and three-stage expansion of combustible gas and one-stage compression. 4-1, 4-4 become three-stage expansion 4-1, 4-4, 4-7, which is applicable to expansion comparison of expanders 4-1, 4-4, 4-7 in refrigerant expansion unit 4 small case.

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Abstract

The invention discloses a volumetric combustible gas liquefying device utilizing compression-expansion refrigeration and a using method thereof. A refrigerant purifying pretreatment unit, a refrigerant compression unit, a multi-stream heat exchanger and a refrigerant expansion unit are sequentially connected end to end through inlets and outlets to form a refrigerant loop; a combustible gas purifying pre-treatment unit, a multi-stream heat exchanger and a combustible gas storage tank are sequentially connected end to end through inlets and outlets to form a combustible gas liquefying loop; the refrigerant compression unit is formed by connecting a plurality of refrigerant compressors; an oil cooling circulating loop is arranged on each refrigerant compressor; the refrigerant expansion unit is formed by connecting a plurality of expanders; and an oil lubricating circulating loop is arranged on each expander. The volumetric combustible gas liquefying device disclosed by the invention can realize liquefying of combustible gas, can be used for liquefying a great deal of combustible gas resources which are stored in conventional or unconventional natural gas fields in remote areas of China, so that transportation cost is reduced; and primary energy sources are sufficiently utilized, so that air environmental pollution caused by direct combustion or emission at present is reduced.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection, in particular to a volumetric compression expansion refrigeration combustible gas liquefaction device and its use method, which utilizes the refrigerant compression and precooling expansion process to provide cooling capacity for combustible gas liquefaction and to recover useful resources and the purpose of energy saving and emission reduction. Background technique [0002] In my country's energy consumption structure, coal accounts for 70.4%, while oil and natural gas account for only 19.7% and 3.3% respectively. difference. my country's coal-based energy consumption structure (technical equipment, energy policies, etc. are all based on coal) has led to serious environmental pollution, severe acid rain in some areas, and frequent occurrence of haze weather (especially in the northern heating season). Threats to human health, but also a great threat to the sust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0204F25J1/0022F25J1/0221F25J1/0257F25J1/0279F25J2210/40F25J2230/30F25J2230/40F25J2240/02F25J2270/16
Inventor 鹿院卫李勇郭亚伟吴玉庭马重芳王景甫
Owner BEIJING UNIV OF TECH
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