带式输送机转载点气水喷雾降尘效果试验研究
Study on dust removing effect of air-water spraying nozzle at transfer point of belt conveyer
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摘要: 为解决煤矿转载点处粉尘污染严重的问题，搭建试验平台模拟转载点处粉尘产生与运移全过程，研究转载区域粉尘分布规律;根据转载点区域粉尘分布情况结合理论计算选择合适的气雾喷嘴结构，并通过试验确定最佳供气压力、供水压力、供水流量以及喷嘴的布置位置。试验结果表明：转载区域产生的粉尘以呼吸性粉尘为主，使用口径为1.5 mm可调广角喷嘴降尘效果较好，供水压力为0.55 MPa、供气压力为0.6 MPa、供水流量为0.25 L/min、喷嘴安装位置选择在距尘源点上方0.85 m位置时，降尘效果最佳。根据试验参数设计气水喷雾降尘系统并在综采工作面转载点处进行现场试验，降尘效率可达90%以上。Abstract: In order to solve the problem of serious dust pollution at the transfer point of coal mine, a test platform was built to simulate the whole process of dust generation and migration at the transfer point, and the dust distribution law in the transfer area was studied. Based on the test results and theoretical calculation, the appropriate type of aerosol nozzle was selected, and the optimal gas supply pressure, water supply pressure, water supply flow and nozzle layout position were determined by a series of experiments. The results show that the dust generated in the transfer area is mainly composed of respirable dust, and the dust reduction effect is best when the adjustable wide angle nozzle with diameter of 1.5 mm is used, the water pressure is 0.55 MPa, the air pressure is 0.6 MPa, the water supply flow is 0.25 L/min, and the nozzle installation position is 0.85 m above the dust source. According to the experimental parameters, the air water spray dust suppression system is designed and field test is carried out at the transfer point of the fully mechanized coal face, the dust removal efficiency can reach more than 90%.
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