Extremely low concentration coal mine gas combustion device and method

Abstract

The invention belongs to the technical field of coal mine gas treatment and emission reduction and relates to an extremely low concentration coal mine gas combustion device and method. Extremely low concentration coal mine gas with methane concentration of 3-5% serves as fuel, and high-temperature smoke of 650-1050 DEG C is generated after combustion is carried out and is recycled. The device and method are characterized in that a heat storage material preheating section (10) and a heat storage material combustion section (11) are included, the extremely low concentration coal mine gas is preheated in the heat storage material preheating section (10) firstly and combusts in the heat storage material combustion section (11), the heat storage material combustion section (11) is heated, and the heat storage material combustion section (11) and the high-temperature smoke transmit heat energy to the heat storage material preheating section (10) and extremely low concentration coal mine gas not combusting in the modes such as conduction, convection and radiation modes, so that continuous and stable combustion is maintained. The extremely low concentration coal mine gas which can not combust under the natural condition serves as the fuel, emission reduction of the coal mine gas with the methane concentration lower than 9% is achieved effectively, and the device and method have the advantages of being high in adaptability to fluctuation of the methane concentration, high in heat recycling efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control and emission reduction, and in particular relates to an extremely low concentration coal mine gas burning device and method, which uses extremely low concentration coal mine gas with a methane concentration of 3% to 5% as fuel, and uses extremely low concentration coal mine gas The gas is preheated inside the combustion device to maintain stable combustion, producing high-temperature flue gas at 650°C to 1050°C, and the heat of the flue gas can be recycled. This technology is suitable for processing and utilizing the gas extracted by the high and low negative pressure vacuum pumps of the coal mine gas extraction pump station. Background technique [0002] The methane concentration of the methane gas extracted by the current coal mine gas extraction pumping station is generally 3% to 30%. Except that part of the pumped gas with methane concentration higher than 9% can be used for int...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a very low concentration coal mine gas combustion device and method, which can not only ensure continuous and stable combustion of very low concentration coal mine gas with a methane concentration of 3% to 5% and a methane combustion efficiency higher than 99.5%, but also solve the problem of Solved the problems of high failure rate of internal combustion engine power generation technology, great influence of gas concentration fluctuations, poor economy of regenerative oxidation technology, low thermal efficiency, and heavy maintenance workload

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