Heating start-up system of mine ventilation air methane oxidized apparatus

Abstract

The invention relates to a heating startup system for a coal mine ventilation air methane oxidizer and belongs to the technical field of low concentration methane reverse-flow oxidation. A hot air generation and adjustment system consists of a fan, a flow control valve, an air inlet, a burner, a hot air temperature adjusting chamber, a thermoelectric couple and ultrahigh temperature valves and is arranged on an external part of an oxidizer body. A hot air distribution header pipe is arranged in a central part of the inside of the oxidizer body and is inserted into a hole on a ceramic heat accumulator. Inlet ends of the hot air distribution header pipe are connected through the ultrahigh temperature valves. Two sides of the hot air distribution header pipe are connected with a plurality of hot air distribution branch pipes which are inserted in holes on the ceramic heat accumulator. To start heating, high temperature generated by the burner and air supplied by the fan are mixed in the hot air temperature adjusting chamber and, after temperature adjustment, heat accumulating ceramic through the hot air distribution header and hot air distribution branch pipes. The system has the advantages of high reliability, low price, easy maintenance, flexible fuel, small power load and so on and improves the stability of the operation of an oxidizer.

Description

technical field [0001] The invention relates to a heating start-up system of a mine exhaust air gas oxidation device, and belongs to the technical field of countercurrent oxidation of low-concentration methane. Background technique [0002] The main component of coal mine gas is methane, which is a high-quality and clean gas energy source, but it is also the biggest safety hazard in coal mine production. In order to improve the safety of coal mine production, a large amount of ventilation is usually used to discharge coal mine gas (called mine exhaust). Almost all coal mines do not attempt to recover and process the methane in the exhaust air of the mine, but directly discharge it into the atmosphere, which not only causes a huge waste of energy, but also causes serious pollution to the atmospheric environment. Methane is a greenhouse gas, and its greenhouse effect over 100 years is 21 times that of carbon dioxide. At present, the total amount of methane emitted by exhaust...

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Problems solved by technology

But this heating method has the following disadvantages: (1) After the electric heater stops heating, the electric heater is in a high-temperature zone with an oxidizing atmosphere for a long time, and the electric heating wire is easily oxidized and becomes brittle, or even broken, and loses the function of restarting; ( 2) The electric heating wire is directly buried in the ceramic regenerator, and the surface temperature of the electric heating wire is more than 100°C higher than that of the surrounding ceramic regenerator, which will cause excessive local thermal stress of the ceramic regenerator and reduce the life of the ceramic regenerator; (3) electric heating It is inconvenient to repair and replace the wire; (4) the power of the electric heater of a single oxidation device is hundreds of kilowatts, which increases the power load of the coal mine

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