Research and application of high pressure spray dust removal technology for fully mechanized mining face with large mining height

The fully mechanized working face with large mining height has high production efficiency, large production capacity and serious dust pollution. In order to solve the problem of poor effect of the existing spray and dust reduction measures in fully mechanized working face with large mining height, taking 24205 working face of Hongliulin Coal Mine as the engineering background, based on the analysis of the characteristics of the coal cutting and dust production by the shearer in fully mechanized working face with large mining height, and by optimizing the technological parameters of the high pressure spray and dust removal, the application of the high pressure external spray dust reduction technology and the dust source tracking spray and dust reduction technology were carried out. The problems of nozzle blockage, insufficient spray volume, short spray range and small coverage area was solved, and the three-dimensional covering spray at the dust source in the process of drum coal cutting was realized. The application results show that the average mass concentration of total dust and respirable dust at the shearer driver decreases from 1 362.4 mg/m³ and 289.1 mg/m³ to 97.4 mg/m³ and 31.7 mg/m³, respectively, the dust removal efficiency is 92.85% and 89.02%, respectively; the average mass concentration of total dust and respirable dust at 10 m downwind of shearer decreases from 456.8 mg/m³ and 97.3 mg/m³ to 45.1 mg/m³ and 9.7 mg/m³, respectively, the dust removal efficiency is 90.13% and 89.76%, respectively. The working environment of working face has been improved obviously.