Accumulation of float coal dust (FCD) in underground mines is an explosion hazard that affects all underground coal mine workers. While this hazard is addressed by the application of rock dust, inadequate rock dusting practices can leave miners exposed to an explosion risk. Researchers at the National Institute for Occupational Safety and Health (NIOSH) have focused on developing a water curtain that removes FCD from the airstream, thereby reducing the buildup of FCD in mine airways. In this study, the number and spacing of the active sprays in the water curtain were varied to determine the optimal configuration to obtain peak knockdown efficiency (KE) while minimizing water consumption.

地下煤矿中的浮煤粉尘（FCD）积累是爆炸危险，影响到所有地下煤矿工人。虽然通过使用粉尘可以解决这种危险，但是粉尘撒施不充分可能会使矿工面临爆炸危险。美国国家职业安全与健康研究所（NIOSH）的研究人员专注于开发水幕，该水幕可将FCD从气流中清除，从而减少矿井中FCD的堆积。在这项研究中，改变了水幕中活性喷雾剂的数量和间距，以确定最佳构型，以在降低耗水量的同时获得最大的击倒效率（KE）。