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Method and system for coalbed methane liquefaction

A technology for coalbed methane and liquefaction equipment, which is applied in the directions of liquefaction, refrigeration and liquefaction, gas fuel, etc., can solve problems such as increasing the complexity of the system, and achieve the effects of improving the utilization rate, expanding the mining range and reducing pollution.

Inactive Publication Date: 2013-04-24
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this device adds a nitrogen expansion system, which increases the complexity of the system, and does not involve the utilization of materials and energy between other units

Method used

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  • Method and system for coalbed methane liquefaction
  • Method and system for coalbed methane liquefaction

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Embodiment 1

[0056] Such as figure 2 As shown, after the coalbed methane is extracted from the well site, the coalbed gas used for the liquefied part first enters the first surge tank 1 of the pressurization and purification unit through the pipeline 11, and then passes through the first booster 2 and the cooler in sequence 3 Carry out pressurization and cooling, and then remove water, acid gas and other impurities in the purification device 4 to become high-pressure normal temperature purified coalbed methane; after purification, normal temperature and high pressure (pressure can be between 1.0MPa and 1.2MPa) coalbed methane It enters the coalbed methane liquefaction device 5 through the pipeline 13, where it is cooled to become low-temperature liquefied coalbed methane. The liquefied low-temperature liquefied coalbed methane enters the liquefied coalbed methane storage tank 9 of the liquefied storage and transportation unit through the pipeline 14 for temporary storage, and waits for th...

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Abstract

A method and a system for coalbed methane liquefaction. The system comprises a pipeline pressurizing purification unit, a liquefaction unit, a liquid storage and transportation unit and a power unit, which are connected through pipelines. Coalbed methane extracted from well site is subjected to supercharging purification and low temperature liquefaction separation and enters into the liquid storage and transportation unit; a the power unit uses untreated coalbed methane and exhaust gas generated from each unit as raw materials for combustion power generation, so as to supply power for the whole system and achieve power self-sufficiency. The system is suitable for field environment without power supply conditions. Exhaust gas from the supercharging purification unit, the liquefaction unit, the storage and transportation unit and the power unit is employed for multiple functional utilization among units; the exhaust gas exchanges heat with a variety of media in different temperature ranges, so as to fully recover and utilize low temperature cooling capacity; pure gas is used as a regeneration gas for regeneration in the purification unit; and the part unable to be reuses is sent into the power unit for generating. The invention can reduce the system energy consumption, improve liquefaction rate of coalbed methane and reduce pollutant emissions.

Description

technical field [0001] The invention belongs to a coal bed gas liquefaction process in the field of chemical industry and low temperature, and in particular relates to a coal bed gas liquefaction method and a coal bed gas liquefaction system. Background technique [0002] Coal-bed methane is also called gas. It is formed by the adsorption of methane in the process of coal formation by porous media. More than 95% of its composition is methane. Coalbed methane is analyzed and separated in the composition of coal mining, diffuses in the air, and can easily cause explosion accidents. It is a harmful gas that has long plagued the safety of coal mine production. At the same time, coalbed methane is also a precious clean energy and an important chemical raw material. Its calorific value is equivalent to that of natural gas, and it is very clean after burning, and hardly produces any waste gas. It is a good industrial, chemical, power generation and residential fuel. If coalbed met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F25J3/00
CPCF25J1/0022F25J1/023F25J1/0242F25J2205/66F25J2210/06F25J2220/62F25J2230/30F25J2245/02F25J2245/90
Inventor 孙兆虎吴剑峰程逵炜公茂琼
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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