t be blocked off. Control of the air flow and air velocity can also reduce the dust production during coal conveying and unloading at the transfer point.
C. Water sprays [16]: Water sprays are the most common methods for dust control. They are installed to suppress dust at all major sources including cutting, loading, transporting and support advancing. The basic principle of dust suppression [17] by water sprays is that the high-velocity water droplets [18] in the mist that are ejected [19] from a nozzle [20] impact and wet the surface of the airborne dust particles, thereby capturing them to become the settled dust.
D. Air scrubbers [21] for intake [22]: To reduce the airborne dust concentration in intake, water sprays should be installed at each transfer point of coal transportation. At these locations, an air scrubber is usually employed in conjunction with the water sprays. A new water-powered scrubber [23] in which the air is moved and cleaned by the water sprays without the need for an electric or hydraulic motor is installed at the stage loader and can reduce by 50% the dust level.
E. Water infusion: Water infusion tends to wet the coal before it is broken by the cutting machine. Therefore, water infusion is not only effective for methane control, it also reduce the airborne dust generation. Tests have proven that it can reduce airborne dust by 69- 79%.
NOTES TO THE TEXT
[1] Dust Control：防尘，矿尘控制
[2] airborne dust：浮沉，气浮矿尘
[3] settle dust：沉落的矿尘
[4] heath hazard：有损健康的危险
[5] inhale： 吸入
[6] bronchial disorders：支气管不适
[7] pneumoconiosis：尘肺病
[8] silicosis：硅肺病
[9] degradation：降低
[10] visual inspection：视觉检查
[11] dust explosion：煤尘爆炸
[12] transfer points：转载点
[13] coal lumps：煤块
[14] dilute：稀释，冲淡
[15] air leakages：漏气，空气泄漏
[16] Water spray：洒水，喷水
[17] dust suppression：抑尘，防尘
[18] water droplets：水滴
[19] eject：喷射
[20] nozzle：喷嘴
[21] Air scrubbers：空气洗涤器
[22] intake：进风巷道
[23] water-powered scrubber：水动空气洗涤器
