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Process technology for preparing liquefied natural gas with coal-mine gas as crude material

A technology for coal mine gas and liquefied natural gas, which is applied in gas fuel, fuel, petroleum industry and other directions, can solve the problem of lack of practice in cascade circulation, and achieve the effects of easy control and maintenance, good performance, and convenient storage and transportation.

Inactive Publication Date: 2007-05-30
熊世平 +3
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  • Summary
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  • Application Information

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Problems solved by technology

Although there is still a gap between domestic expanders and expanders in other developed countries, the isentropic efficiency of foreign expanders can generally reach 85%, but it is not difficult for domestic expanders to achieve 80% isentropic efficiency
In contrast, the domestic mixed refrigerant cycle process has not been fully grasped, and there is still a lack of complete practice of the cascade cycle

Method used

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  • Process technology for preparing liquefied natural gas with coal-mine gas as crude material

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Embodiment 1

[0037] Production of liquefied natural gas (LNG) from coal mine gas

[0038] 1. Raw material gas under normal temperature and pressure: 310m 3 / h

[0039] 2. Deoxidize the raw material gas (in the deoxygenation device, the oxygen in the gas gas will be burned to generate CO when it meets red hot coke 2 , a small amount of CO 2 It is reduced by charcoal to further generate CO), after dust removal and crude H removal 2 O and other pretreatments to obtain gas that can be safely used in the production of LNG. Sampling and analysis components are as follows: CH 4 _47.52%, N 2 _44.12%, O 2 _0.45%, CO 2 _4.88%, CO_2.11%, H 2 _1.15%, H 2 150mg / m for S and others 3

[0040] 3. Use a 1-5 / 50 compressor to pressurize the above gas to 2.5-3.5MPa and enter the ethanolamine absorption tower to remove CO 2 and H 2 S impurity, so that its content is reduced to ≤10PPm, and then enters the molecular sieve dryer to reduce the water in the gas to ≤10PPm. The purified gas enters the l...

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Abstract

The invention discloses a making method of liquefied natural gas (LNG), which is characterized by the following: adopting coal gas as raw material; predisposing coal gas; liquefying under low temperature; making oxygen content in the gas lower than 0.5%; pressurizing; entering into composite purifying device of solvent and molecular sieve; reducing the content of CO2, H2S and H2O to preset scale; cooling gas in the plate-fin heat exchanger to liquefy; rectifying in the fractional tower; separating methane at LNG pattern; cooling to enter LGN product reserving tank; obtaining LNG product; fitting for automobile fuel or powering.

Description

technical field [0001] The invention relates to a method for preparing liquefied natural gas (LNG). It specifically involves using coal mine gas as raw material, deoxidizing, pressurizing, and removing CO 2 、H 2 S and H 2 O and other pretreatments, followed by cooling liquefaction and low-temperature fractionation to separate the methane in the form of LNG products. Background technique [0002] my country's coalbed methane (ie, coal mine gas) resources are relatively abundant. According to reports, the total reserves of my country's coalbed methane resources are about 30 trillion cubic meters, distributed in 24 provinces in my country. Among them, the reserves of coalbed methane resources in Shanxi Province alone amount to about 10 trillion cubic meters, accounting for 1 / 3 of the country's total. The utilization level of coalbed methane in my country is relatively low, and quite a few coal mines are venting gas, which not only wastes precious resources, but also causes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 熊世平封万芳熊松文汪荣华
Owner 熊世平
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