关键词: 转载, 破碎, 呼吸性粉尘, 粉尘分布, 降尘系统

Abstract: In order to improve working conditions of transfer and crushing zone in fully mechanized caving face, the dust distribution characteristics of the transfer and crushing point are mastered by dust dispersion analysis and field measurement firstly, and four main dust producing points and their causes are obtained. The PM5 of the dust at 1m of the reversed loader head accounts for 85.19%. After the coal and the belt conveyor hit violently, a large amount of respirable dust is produced. The PM10 proportion of dust at the crusher can reach 98%, which comes from the gap between the two protective cover due to the connection not matching. The dust particle size distribution is rel-atively uniform at the front and back passes, mainly because the coal is generally larger and carries higher potential energy, and a large amount of dust is generated after the fall. Respirable dust is continuously generated at 1m of the reversed loader head. A large amount of respirable dust is also produced at the crusher, but the rate of accumulated respirable dust is relatively slow, and the proportion of inhalable dust at the front and back passes is relatively sta-ble and high. Then according to the characteristics of each dust production point, different spray dust reduction system is used and the corresponding dust reduction device is designed. The transfer point spray system forms a full-section spray dust suppression, the crusher spray system seals the dust in the crusher and settles, and the front and back passes spray system uses fog to completely cover the dust. Finally, through field inspection, it has a good dust reduction effect.