Gas drainage by vacuum pump / compressor

There are several basic forms of gas drainage by imported vacuum pump / compressor 

According to the relationship between coal mining and drainage: pre pumping before mining, that is, the drainage of coalbed methane from the undeveloped coal seam. Because the mining area is wide and the pipeline is long, it usually has dozens of kilometers. The working environment is bad, so the imported vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. At present, the imported vacuum pump / compressor is designed and manufactured with international advanced technology, and the gas volume can reach 500 ~ 70000m3 / h, which can fully meet the needs of coal mining industry. This pumping method has gradually become the mainstream. This method not only becomes the guarantee of safe production, but also becomes a new clean energy, which has strategic significance for China, a big coal country. Pumping while excavating and mining while pumping, that is, CBM drainage in the process of coal seam mining. After mining drainage, namely abandoned mine, mining roadway CBM drainage.

The drainage method is divided into: drilling drainage, drilling coal seam, and using loosening technology to increase the release area and conduction of coalbed methane, so as to make the rapid release of coalbed methane. Reduce the release in the process of excavation. This method has good effect and high utilization rate of coalbed methane. Generally, imported vacuum pump / compressor is used for pumping. Roadway method drainage, the goaf roadway, mining roadway gas drainage, to ensure the safe concentration. It includes surface vertical well pumping, mixed pumping, etc.

The target layers of electric drainage include: extraction from mining layer, drainage from adjacent strata, drainage from goaf, etc. The technology of gas drainage is to set up a gas pumping station on the ground and connect with the drainage borehole through the underground gas drainage pipeline system. When the pump is running, it will cause negative pressure, and the gas will be pumped out into the gas tank or directly supplied to the user. If the amount of gas extracted is small or unstable, it can be directly discharged into the atmosphere.

According to the specific location and layout of the mine excavation, the imported vacuum pump station is generally set on the ground (underground). The enclosure (shed) of the gas drainage room should ensure that there are no residents within 50m around the gas drainage room, no open fire within 20m, no inflammable and explosive materials, and four dry powder fire extinguishers and no less than 0.5m ~ yellow sand are installed.

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