Applied Research of the Dust Removal Technology and Equipment for High Pressure External Spray in the Large Section Coal Lane

In view of such problems as low external spray pressure of the original comprehensive excavator, working pressure failing to meet the requirements of "coal mine safety regulations", and low dust removal efficiency in Wangjialing Coal Mine, on the basis of analyzing the characteristics of dust production in the large section coal lane, the secondary negative pressure atomization dust removal technology is adopted to transform it. The research focuses on the high efficiency spray and dust removal device of the integrated excavator, the spray and dust removal process parameters, and the supporting process of the airborne spray and dust removal system, finally, the high pressure external spray dust removal technology that suitable for large section coal lane working face are put forward. The application results show that under the optimal process parameters, the dust removal efficiency of the single total dust and respiratory dust at the position of the driver of the integrated excavator can be improved from 57.03% and 51.83% to 81.10% and 76.90% respectively. The comprehensive dust removal efficiency can be improved from 94.39% and 91.03% to 97.85% and 93.32% respectively.