Goodman G V
Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, Pennsylvania, USA.
Appl Occup Environ Hyg. 2000 Jul;15(7):550-60. doi: 10.1080/10473220050028376.
Supplemental water sprays were placed along the sides of a continuous mining machine to improve suppression and confinement of the dust cloud under the cutting boom to reduce downwind dust levels. Using a full-scale mock-up of a continuous mining machine, preliminary work showed that these side sprays improved suppression of the dust cloud and redistributed this cloud under the cutting head. This led to reductions in dust levels around the machine and in down-wind airways for some positions of the mining machine. This testing also showed that side spray effectiveness was influenced by the distance from the fresh air ventilation device to the cutting surface, termed the ventilation setback distance. These sprays produced larger reductions in machine and return dust levels at smaller setback distances than at larger setback distances. These side sprays then were installed in similar locations on a mining machine at an underground coal mine operation to evaluate their effectiveness for improving suppression and capture of dust by the flooded-bed dust scrubber. Although sampling could not be conducted successfully in the return, sampling around the mining machine and at the machine operator showed that dust levels decreased with use of these sprays. Further analysis showed that these sprays were most effective at the smaller setback distances, a result confirmed by full-scale laboratory testing.
在连续采煤机的侧面放置了辅助喷水装置，以增强对切割臂下方粉尘云的抑制和控制，从而降低下风流方向的粉尘浓度。通过使用连续采煤机的全尺寸模型进行的前期工作表明，这些侧面喷水装置改善了对粉尘云的抑制效果，并使粉尘云在切割头下方重新分布。这使得采煤机周围以及采煤机某些位置的下风巷道中的粉尘浓度降低。该测试还表明，侧面喷水装置的效果受新鲜空气通风装置到切割面的距离（即通风后退距离）的影响。与较大的通风后退距离相比，这些喷水装置在较小的通风后退距离下能使采煤机处和回风粉尘浓度有更大程度的降低。随后，这些侧面喷水装置被安装在一座地下煤矿作业的采煤机上的类似位置，以评估其对水床式粉尘洗涤器提高粉尘抑制和捕集效果的作用。尽管无法在回风处成功进行采样，但在采煤机周围和采煤机操作员处的采样显示，使用这些喷水装置后粉尘浓度降低了。进一步分析表明，这些喷水装置在较小的通风后退距离下效果最为显著，这一结果在全尺寸实验室测试中得到了证实。
