Experimental investigation and application of dry-type filtering dust collection technology in fully mechanized excavation face

The coal mine dust induced an increasing coal miner’ s pneumoconiosis and serious coal dust explosion. However,the existing wet dust collection technologies are generally inefficient. According to the environmental condi- tions of fully-mechanized excavation face in coal mine,the main influencing factors of dry-type filtering dust collection technology in fully-mechanized excavation face are water spraying in the air,uniformity of cleaning and cleaning strate- gy,etc. Therefore,dry-type filtering dust collection experiment system and prototype are built in this study. An experi- mental study shows that a moderate amount of spray (2 200 mL / min) is beneficial to improve the filtration perform- ance of the dust collection system. The installation of the normal cone and column cone in the filter cartridge can im- prove the injection flow field. The positive and reverse cleaning mode is more conducive to improve the cleaning effect and reduce the dust emission concentration respectively. A dry-type filtration dust collector KCG-200D is developed and applied in the Gequan coal mine. The total and respirable dust collection efficiencies are 97. 39% and 96. 41% at the scene.