Researchers at the National Institute for Occupational Safety and Health (NIOSH) performed laboratory testing to improve longwall dust control by examining the use of underside shield sprays in conjunction with the longwall directional spray system. In a field survey of longwall operations, NIOSH researchers observed dust clouds created by the fracturing and spalling of coal immediately upwind of the headgate drum that migrated into the walkway, exposing mining personnel to respirable coal dust. The goal of this research was to create an effective traveling water curtain to prevent this dust from reaching the personnel walkway by redirecting it toward the longwall face. The location, orientation, and pressure of the water sprays were the primary testing parameters examined for minimizing dust exposure in the walkway. Laboratory testing indicates that the use of underside shield sprays on the longwall face may be beneficial toward reducing respirable dust exposure for mining personnel.

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用于改善长壁喷水系统粉尘控制的底面屏蔽喷水的实验室研究

美国国家职业安全与健康研究所 (NIOSH) 的研究人员进行了实验室测试，通过检查底部防护喷雾与长壁定向喷雾系统的使用来改善长壁粉尘控制。在对长壁作业进行的现场调查中，NIOSH 研究人员观察到，煤的压裂和剥落立即在移动到走道中的井口滚筒逆风处产生的粉尘云，使采矿人员暴露在可吸入的煤尘中。这项研究的目标是创建一个有效的移动水幕，通过将其重新导向长壁工作面来防止这些灰尘到达人员走道。喷水的位置、方向和压力是主要测试参数，用于最大程度地减少人行道中的灰尘暴露。