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Oxygen-bearing coal-bed gas low-temperature concentration method and device for implementing method

A low-temperature enrichment, coalbed methane technology, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of high energy consumption, complex process flow, etc., and achieve the effect of low energy consumption, low energy consumption, and a small number of equipment

Inactive Publication Date: 2016-02-03
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the pressure of oxygen-containing coalbed methane, the more dangerous it is, which is a key issue that limits the application of adsorption and membrane separation methods; the high energy consumption and complicated process are the main reasons that limit the application of cryogenic distillation

Method used

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  • Oxygen-bearing coal-bed gas low-temperature concentration method and device for implementing method
  • Oxygen-bearing coal-bed gas low-temperature concentration method and device for implementing method
  • Oxygen-bearing coal-bed gas low-temperature concentration method and device for implementing method

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Experimental program
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Effect test

Embodiment 1

[0030] The present embodiment is 35% with methane content, and nitrogen content is 50%, and oxygen content is about 15% oxygen-containing coalbed methane (also contains trace hydrogen sulfide, carbon dioxide and water), then according to figure 1 The steps shown and figure 2 Described equipment carries out low-temperature concentration, and specific steps are as follows:

[0031] Pressurize the oxygen-containing coalbed methane to 0.2MPa at 40°C in the compressor 5, then purify the oxygen-containing coalbed methane in the purifier 6 until the hydrogen sulfide content is less than 5ppm, the carbon dioxide content is less than 100ppm, and the water content is less than 0.1ppm; Pass the purified gas into the heat exchanger 1 to cool down to -169°C, then pass the cooled oxygen-containing coalbed gas into the gas-liquid separator 2 for gas-liquid separation; the separated liquid passes through the liquid throttle valve 3 The liquid phase throttling is obtained, the obtained liqui...

Embodiment 2

[0035] In this implementation, the methane content is 60%, the nitrogen content is 31.667%, and the oxygen-containing coalbed methane with an oxygen content of about 8.333% (also contains traces of hydrogen sulfide, carbon dioxide and water), and then according to figure 1 The steps shown and image 3 Described equipment carries out low-temperature concentration, and specific steps are as follows:

[0036] Pressurize the oxygen-containing coalbed methane to 0.2MPa at 40°C in the compressor 5, then purify the oxygen-containing coalbed methane in the purifier 6 until the hydrogen sulfide content is less than 5ppm, the carbon dioxide content is less than 100ppm, and the water content is less than 0.1ppm; The purified coal gas is passed into the heat exchanger 1 to cool to a temperature of -169.5°C, and then the cooled oxygen-containing coalbed gas is passed into the gas-liquid separator 2 for gas-liquid separation; the separated liquid is obtained through the liquid throttle valv...

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Abstract

The invention discloses an oxygen-bearing coal-bed gas low-temperature concentration method and a device for implementing the method. The method comprises the following steps: conducting pressurization and purification on oxygen-bearing coal-bed gas; cooling the purified oxygen-bearing coal-bed gas; conducting gas-liquid separation on the cooled oxygen-bearing coal-bed gas; respectively throttling the gas and liquid obtained from gas-liquid separation to obtain a throttling liquid phase and a throttling gas phase; introducing the obtained throttling liquid phase and throttling gas phase into the purified oxygen-bearing coal-bed gas through heat-exchange cooling, so that the concentrated oxygen-bearing coal-bed gas is obtained when the throttling liquid phase is subjected to heat exchange. According to the method, the main cold energy is provided through oxygen-bearing coal-bed throttling and cooling, no or only a little of cold energy provided by an external refrigeration system is needed, and the energy consumption is low, so that the method is a simple, feasible and low-energy-consumption oxygen-bearing coal-bed gas treatment method; furthermore, through adoption of the device provided by the invention, low-temperature concentration of the oxygen-bearing coal-bed gas can be realized; the quantity of components in the device is small, and thus the adaptability is high.

Description

technical field [0001] The invention belongs to a concentration method and device, in particular to a low-temperature concentration method for oxygen-containing coal-bed methane, in particular to a low-temperature concentration method for oxygen-containing coal-bed methane, especially for oxygen-containing gas with a methane volume fraction above 30%, and a device for low-temperature concentration. Background technique [0002] Oxygen-containing coalbed methane belongs to the associated gas in coal mine production, also known as coal mine gas, and its methane volume fraction is between 30% and 80%. This type of coalbed methane contains air, and the lower the methane content and the higher the air content, the greater the risk of transporting and utilizing the coalbed methane. [0003] The state stipulates that coalbed methane with a methane volume fraction of more than 30% should be utilized. Concentrating oxygen-containing coalbed methane is conducive to better utilization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 陈金华朱菁蔡安宁姚成林刘利亚肖正文娟张斌张浩甘海龙
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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