Research and application of comprehensive prevention and control technology of dust in working face with 8 m extra large mining height

The fully mechanized mining technology with 8 m extra large mining height and above has greatly increased coal production, but its dust production and stope space also increase accordingly, making it difficult for traditional dust-proof technology to solve the resulting dust pollution problem.In order to solve the problem of dust pollution, this paper puts forward the idea of zoning dust control in fully mechanized coal mining face with large mining height, which is mainly based on coal shearer cutting coal dust prevention and hydraulic support dust prevention.Through the combination of numerical calculations, laboratory tests and field tests, the comprehensive dust prevention and control technology of "air-water spray + airborne dust removal + support closed dust control + high-position dust extraction and micromist purification" has been developed, and developed long-range and low-consumption air-water spray device, coal shearer random dust extraction and purification device, hydraulic support closed dust control device and negative pressure dust removal and micro mist purification device, and finally formed a set of comprehensive dust prevention and control technology and equipment suitable for fully mechanized mining with 8 m extralarge mining height. The results show that the comprehensive dust reduction efficiency of the four measures is more than 90%, and the dust concentration in the manned working space of the working face can be reduced to less than 10 mg/m³. The effect is significant, and it can effectively solve the problem of dust pollution similar to large mining heights.