基于压气控尘-环缝引射技术的钻孔干式除尘装置研究
Research on dry-type dust removing device of borehole based on pressure air dust control and ring slot ejecting technology
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摘要: 针对目前煤矿井下碎软煤层瓦斯抽采钻孔采用空气复合定向钻进技术存在控尘及除尘难的问题，提出了1种孔口压气控尘、环缝引射干式除尘的新技术，并采用试验、数值模拟等方法对钻孔压气控尘结构和参数、除尘器动力部件及分级除尘技术进行研究。研究结果表明：当钻孔排渣压力为0.3 MPa，控尘压力为0.5 MPa时，控尘效率达99.61%；旋风除尘装置的过效率达到了92.9%以上，阻力≤620 Pa；布袋除尘器过滤风速在1.1 m/s时，除尘效率达99.95%；现场应用效果表明，在碎软煤层定向钻孔施工过程中，周围1 m内的粉尘降尘达99.3%以上。Abstract: In view of the difficulties in dust control and dust removal in the gas drainage borehole of soft broken coal seam in coal mine, a new technology of dust control by air pressure at orifice and dry dust removal by annular seam injection is proposed. By means of experiment and numerical simulation, the dust control structure and parameters, dynamic components of dust collector and classification dust removal technology are studied. The research results show that: when the drilling slag discharge pressure is 0.3 MPa and the dust control pressure is 0.5 MPa, the dust control efficiency can reach 99.61%; the over efficiency of cyclone dust removal device reaches more than 92.9%, and the resistance is less than or equal to 620 Pa; when the filtering wind speed of bag filter is 1.1 m/s, the dust removal efficiency reaches 99.95%. The field application results show that the dust fall within 1 m around is more than 99.3% in the construction process of directional drilling in broken soft coal seam, which has achieved good field application effect.
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