Coal mine gas blending device

Abstract

The invention provides a coal mine gas blending device which comprises an inlet flange, a blending gas inlet pipe, an annular pipe nest, an outlet flange and a pipeline body. Ventilation gas in an upstream ventilation gas pipeline can flow into the pipeline body via the inlet flange, extraction gas can flow into the pipeline body via the blending gas inlet pipe and annular pipes, the extraction gas and the ventilation gas are blended with each other in the pipeline body, and blended gas can flow into a downstream ventilation gas pipeline from the outlet flange. The coal mine gas blending device has the advantages that the coal mine gas blending device is simple in structure, easy to machine and manufacture and convenient to assemble in engineering fields; consumption of external energy can be omitted; the coal mine gas blending device is high in blending speed and blending uniformity, the uniform blending speeds can be increased, the blending distances can be shortened to a great extent, and the accuracy of downstream methane concentration detection and flow detection, the stability of oxidizing devices and the safety of systems can be powerfully guaranteed.

Description

technical field [0001] The invention relates to the technical field of pneumatic mixing, in particular to a coal mine gas mixing device. Background technique [0002] Regenerative oxidation is an important and most promising technology for dealing with coal mine ventilation gas with low methane concentration (<0.75%), difficult enrichment, and large gas volume. In the actual operation of the thermal storage oxidation device based on the thermal storage oxidation technology, the methane concentration in the ventilation gas is too low (<0.3%) and fluctuates greatly, which is not conducive to the stable operation of the oxidation device; For heat, electricity and other energy needs, it is usually necessary to mix the drainage gas with a high concentration of methane (about 8-30%) in the ventilation gas with a very low concentration. On the one hand, the concentration of the gas gas is maintained at a relatively stable value. On the other hand, it is ensured that the heat...

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Problems solved by technology

But at the same time, its structure is slightly complicated, and the mixing section itself is long, which has a certain impact on the space layout. The pressure loss of these two mixing methods is relatively larger; "(CN201424957Y), compared with the baffle plate and swirl blending method, the blending in the form of surrounding air pipes has lower pressure loss, and can also achieve better blending, but its structure is also cumbersome, and the on-site assembly of the project is more complicated.

[0005] The various blending methods above all have problems such as cumbersome structure, complex engineering site equipment, long blending distance, large pressure loss during the blending process, etc., especially in the application of large-diameter ventilation gas blending. , Engineering advantages of easy installation

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