Mixer used for ventilation air methane and drawing-out methane and having automatic concentration control function

Abstract

The invention relates to a mixer used for ventilation air methane and drawing-out methane and having an automatic concentration control function, belonging to the field of gas supplying technology for oxidation apparatuses of coal mine ventilation air methane. The mixer provided by the invention has a cylindrical shell; two ends of the shell are a ventilation air methane inlet end and a mixed gas outlet end, respectively; the excircle surface of the shell is provided with a plurality of drawing-out methane inlet pipes; the ventilation air methane inlet end of the shell is provided with a transition pipe with increasingly decreasing diameters; the transition pipe is connected with the shell via casting or welding; the tail end surface of the transition pipe is located at one side, close to the ventilation air methane inlet end, of the axis of each of the drawing-out methane inlet pipes; the shell is also internally provided with a valve core capable of moving along the axis of the shell; a gas inlet gap is formed between one end surface of the valve core and the end surface, close to the ventilation air methane inlet end, of the transition pipe, and the other end of the valve core is fixedly connected with a driving mechanism driving the valve core to move; and the mixer is further provided with a gas flow valve body. The mixer provided by the invention realizes uniform mixing of large-flow ventilation air methane and drawing-out methane and has a wide application scope.

Description

technical field [0001] The invention belongs to the technical field of gas supply for a coal mine exhaust air oxidation device, and mainly relates to an exhaust air and exhaust gas mixer with the function of automatic concentration control. Background technique [0002] Coal mine exhaust air oxidation device can utilize exhaust air on a large scale and at low cost to achieve zero methane emissions from coal mining. In order to ensure the safe operation of the exhaust air oxidation device in coal mines, it is generally required that the concentration of methane in the exhaust air be less than 1.5%, and local overconcentration cannot occur. strict requirements. [0003] Since the processing capacity of each set of coal mine exhaust air oxidation device is generally tens of thousands of cubic meters per hour, the existing mixer cannot meet the mixing requirements of exhaust gas and exhaust air; with the research and application of coal mine exhaust air oxidation device, althou...

AI Technical Summary

Problems solved by technology

[0003] Since the processing capacity of each set of coal mine exhaust air oxidation device is generally tens of thousands of cubic meters per hour, the existing mixer cannot meet the mixing requirements of exhaust gas and exhaust air; with the research and application of coal mine exhaust air oxidation device, although There are some mixers for mixing exhaust gas and exhaust gas, but there is no exhaust gas and exhaust gas mixer with automatic concentration control function

Existing patents "Mixer for Coal Mine Drainage Gas and Ventilation Gas" (Application No.: CN 201020519416.1) and "A Self-priming Swirling Coal Mine Drainage Gas and Ventilation Gas Mixing Device" (Application No.: CN 201320813562.9) The mixer in the pump only plays the role of mixing the exhaust air and exhausting the gas, and does not have the function of adjusting the methane concentration after mixing, and the exhausted gas is mixed with the exhaust air through the conical tailpipe or the small hole on the throat of the mixer; now There is a patent "a safety automatic adjustment system for gas concentration" (application number: CN 201420306424.6), which relies on the opening of the automatic adjustment valve outside the mixer to adjust the mixed gas concentration

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