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Low-concentration gas and ventilation air methane thermal oxidation generating system and method of coal mine

A low-concentration gas and power generation system technology, applied in the field of high-efficiency thermoelectric conversion, can solve the problems of large fluctuation range, unrealized large-scale application, low gas concentration, etc., to expand the concentration limit, avoid excessive single unit capacity, save The effect of using water resources

Inactive Publication Date: 2012-10-24
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] Due to the characteristics of low-concentration gas and exhaust gas in coal mines (large air volume, low gas concentration and large fluctuation range), there are great difficulties in the traditional combustion technology, especially in how to generate high-grade electric energy
Therefore, coal mine low-concentration gas (≤30%) and exhaust gas gas (≤1%) have not been widely used in power generation.

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  • Low-concentration gas and ventilation air methane thermal oxidation generating system and method of coal mine

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Embodiment Construction

[0016] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0017] As shown in the accompanying drawings, the coal mine low-concentration gas and exhaust air gas thermal oxidation power generation system is mainly composed of a gas oxidation device, inlet and exhaust devices connected to the gas oxidation device, a circulating water treatment system, and a screw-type gas generator connected to the generator 10. The expander 9 is composed of an expander, wherein: the gas oxidation device includes a porous ceramic oxidation bed 6, a plurality of built-in heat exchangers 7 arranged in parallel at intervals on the upper and lower parts of the porous ceramic oxidation bed 6, and the middle part of the porous ceramic oxidation bed 6 is provided with at least one oxidation The bed starts the heater 17, and the ports of multiple built-in heat exchangers 7 are respectively connected to the drum 8 of the circulating water trea...

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Abstract

The invention relates to low-concentration gas and ventilation air methane thermal oxidation generating system and method of a coal mine. The system mainly comprises a multi-gas oxidation device, a water treatment device, a screw rod type expander, a generator, a condenser and the like. In the method, low-concentration gas and ventilation air methane of the coal mine are adopted to carry out periodic reciprocating flowing type superheated oxidation reaction in a porous ceramic oxidation bed, the reaction heat is extracted with work medium water through an internal heat exchanger, generated superheated vapor enters the screw rod type expander to do work, and the heat energy is converted to the mechanical energy to drive the generator to generate the power. The system and the method have the advantages of simpleness, reasonable single machine capacity matching, convenience in operation and good use effect.

Description

technical field [0001] The invention relates to a thermal oxidation power generation system and method for coal mine low-concentration gas and exhaust air gas, which is especially suitable for oxidizing coal mine gas and converting reaction heat into high-efficiency thermoelectricity. Background technique [0002] In my country's conventional energy composition, the total amount of coal resources is about 5.57 trillion tons, and the amount of gas (coal bed methane) resources within 2000m underground is about 30-35 trillion m 3 , the important position of effective mining and utilization of coal and gas resources in my country's national economic development has become increasingly prominent. Gas is a non-renewable resource associated with coal. At the same time, gas is also a clean and efficient energy source, and its calorific value can reach 33.5-36.8MJ / m 3 , 1m 3 Gas is equivalent to the calorific value of 1.3kg standard coal, and its utilization process will not produc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00F01D15/10
Inventor 李庆钊林柏泉
Owner CHINA UNIV OF MINING & TECH
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