Method for treating oxygen-bearing coalbed methane by using coal gangue

Abstract

The invention relates to a method for treating oxygen-bearing coalbed methane by using coal gangue. According to the method, the oxygen-bearing coalbed methane is used as raw material, and the coal gangue is used as a catalytic deoxidizing agent, and thermo-chemical treatment is conducted in a microwave oven; deoxidized and desulfurized methane liquefied gas, liquefied carbon dioxide and liquefied nitrogen are prepared through desulfurization purification, pressure swing adsorption separation and compression under the action of the coal gangue and the oxygen-bearing coalbed methane, and meanwhile, an aluminosilicate mixture is obtained through decarburization of the coal gangue; and the liquefied methane and tail gas can be used as burning energy, the liquefied carbon dioxide can be used as chemical material, the liquefied nitrogen is used as inert protective gas, and the aluminosilicate mixture can be used as the chemical material. The treating method has the advantages that process is advanced, data is full and accurate, the waste coal gangue is used, the oxygen-bearing coalbed methane is treated, coal gangue pollution and coalbed methane pollution are treated, new products are obtained, and a double-advantage of the process is achieved.

Description

technical field [0001] The invention relates to a method for treating oxygen-containing coal bed gas with coal gangue, and belongs to the technical field of coal bed gas deoxidation and coal gangue treatment methods. Background technique [0002] Coal is not only a kind of energy, but also a kind of chemical raw material. Along with coal mining, coalbed methane and coal gangue will be produced. [0003] The main component of coalbed methane is CH 4 , is stored between coal seams, and is a symbiotic resource with coal. In the current mining methods of coalbed methane, some coalbed methane is mined by underground drainage, and the CH of coalbed methane is extracted underground. 4 The volume content is about 50%, and the rest is air. Because it contains a certain amount of oxygen, direct use has potential safety hazards, so it must be deoxygenated before subsequent operations; coal-bed methane discharged directly into the atmosphere due to coal mining reaches 315% every year i...

AI Technical Summary

Problems solved by technology

[0003] The main component of coalbed methane is CH 4 , is stored between coal seams, and is a symbiotic resource with coal. In the current mining methods of coalbed methane, some coalbed methane is mined by underground drainage, and the CH of coalbed methane is extracted underground. 4 The volume content is about 50%, and the rest is air. Because it contains a certain amount of oxygen, direct use has potential safety hazards, so it must be deoxygenated before subsequent operations; coal-bed methane discharged directly into the atmosphere due to coal mining reaches 315% every year in the world. -54 billion m 3 , China is a major country of coalbed methane emissions, accounting for 30% of emissions, due to CH 4 The greenhouse effect of CO is 2 21 times that of coalbed methane, the direct discharge of coalbed methane has caused extremely serious environmental pollution, which is an urgent problem to be solved at present

[0004] At present, the treatment methods of oxygen-containing coalbed methane mainly include catalytic deoxidation method, such as CN02113627 patent, and coke combustion method, such as CN1919986A patent, etc.; catalytic deoxidation method requires an external catalyst, and coke combustion method requires the use of coke. The above two methods consume a lot of energy in actual operation. Large energy, which will increase the cost of coalbed methane deoxidation, which is not conducive to actual production and application

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