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Device for treating low concentration methane in ventilation air methane (VAM) of coal mine and method thereof

A low-concentration mine technology, applied in mining equipment, combustion methods, lighting and heating equipment, etc., can solve problems such as increased gas utilization, inability to deal with methane, and frequent changes in methane concentration in exhaust air, achieving small pressure loss and low operating costs Reduced effect

Inactive Publication Date: 2009-09-23
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional technology cannot process the methane in the exhaust gas of the mine to obtain heat
Secondly, changes in the working face lead to frequent changes in the flow rate and methane concentration of exhausted air, which also increases the difficulty of gas utilization.

Method used

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  • Device for treating low concentration methane in ventilation air methane (VAM) of coal mine and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Applying the method described in the present invention to set up a set of processing capacity is 1000m 3 / h mine exhaust gas flow direction conversion catalytic combustion heating device, such as figure 1 shown. First, open the pneumatic three-way valve V-1 for air supply, close the gate valve V-2 at the mine gas inlet, heat exchanger E-1 does not take heat temporarily, and open the A heating equipment A-1 and B at the upper end of the catalytic reactor to heat The power supply of equipment B-1 starts heating; while heating, open the air inlet pneumatic three-way valve V-3, the air outlet pneumatic three-way valve V-5, close the air inlet pneumatic three-way valve V-4, the air outlet pneumatic three-way valve V -6, the air enters the catalytic reactor R-A from the air intake pneumatic three-way valve V-3 and is heated by the heating device A-1, and then enters the heating section B-1 at the top of the catalytic reactor R-B to continue heating, so that the hot air flow ...

Embodiment 2

[0031] The reaction device is as in Example 1, the catalyst and the regenerative fillers at both ends are preheated to the catalyst activation temperature of 450°C, and the exhaust gas flow rate of the mine is 1000m 3 / h, the methane concentration is 0.3%, the reversing period is 540s, the reaction can be carried out autothermally, and the methane conversion rate reaches over 95%.

experiment example 3

[0033] The reaction device is as in Example 1, the catalyst and the regenerative fillers at both ends are preheated to the catalyst activation temperature of 450°C, and the exhaust gas flow rate of the mine is 1000m 3 / h, the methane concentration is 0.6%, the reversing period is 540s, the methane conversion rate reaches over 95%, and the heat exchanger can remove part of the heat.

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Abstract

The invention relates to a device for treating low concentration methane in ventilation air methane (VAM) of a coal mine and a method thereof. A reverse flow catalytic combustion device is utilized at an outlet of a mine ventilation main fan to directly treat the methane, and part of the heat can be recovered. The device comprises two catalytic reactors, a heat exchanger, two groups of pneumatic three-way valves which can be automatically started and stopped to commutate periodically, an automatic air supply pneumatic three-way valve and an exhaust fan; wherein, the bottoms of the catalytic reactors are filled with honeycomb ceramics heat accumulation filler, and the middle sections thereof are provided with catalyst; electric heating tubes provided with fins are positioned on the top of the catalytic reactors and arranged in a certain way, so as to be taken as a preheater and a ventilation air methane distributor, thus ensuring the heating efficiency and the ventilation air methane to be evenly distributed. The invention can be used for treating the ventilation air methane having the methane concentration being lower than 1%, and the removing rate of the methane reaches more than 95%. When the methane concentration is higher than 0.6%, part of the heat can be extracted from the system; when the methane concentration increases to 0.3%, the reaction system can process by self heating without needing extra energy supply.

Description

Technical field: [0001] The invention relates to a device and a method for treating low-concentration methane in coal mine exhaust gas. Background technique: [0002] With the rapid development of the national economy, China is facing the dual pressure of resource scarcity and environmental degradation, and the effective use of low-grade resources has become an urgent national major demand. my country is rich in coalbed methane resources with methane as the main component, but the utilization rate is less than 10%. And because the coalbed methane in the coal mine is not extracted in time, cause major mine accidents to occur frequently, causing a large number of casualties. Even if some mines are well ventilated, the large amount of chemical energy contained in the low-concentration methane in the exhaust air of the mines has not been effectively utilized. At the same time, since the greenhouse effect of methane is about 21 times that of an equivalent amount of carbon dioxi...

Claims

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Application Information

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IPC IPC(8): E21F7/00F23G7/07
Inventor 朱吉钦王天明李建伟任润厚郭金刚王志杰李成岳王东飞王树忠傅国廷刘新斌张文平秦清平郭翔
Owner BEIJING UNIV OF CHEM TECH
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