气水喷嘴雾化特征与降尘效果分析

发布时间：2018-10-07 18:03

【摘要】：为提高气水喷嘴在煤矿井下高浓度粉尘作业场所的喷雾降尘效率,通过实验研究了气水喷嘴的雾化特性参数,得出了雾滴平均直径与气、水流量的变化规律;以煤矿综掘工作面气水喷雾降尘过程为研究对象,建立了相应的数学模型,推导出了气水喷嘴降尘效率的关系式,采用Matlab软件绘制了降尘效率曲线.研究表明:水流量一定时,气体流量越大降尘效率越大;气体流量一定时,降尘效率随水流量的增大先增大后减小;粉尘粒径越大,喷雾雾滴有效作用距离越长,粉尘越容易被沉降;要使气水喷嘴的降尘效率达到80%以上,气体流量必须大于150×10~(-5)m~3/s,最佳的气水流量比范围为100~150.依据工作面粉尘的粒径分布和降尘效率要求,参照相关曲线选择最佳的气水流量,可以达到更好的降尘效果和经济效益.
[Abstract]:In order to improve the efficiency of spray dust reduction of air-water nozzles in coal mine, the atomization characteristic parameters of gas-water nozzles are studied through experiments, and the variation law of average diameter of droplets and gas and water flow are obtained. Taking the dust control process of gas-water spray in fully mechanized coal mining face as the research object, the corresponding mathematical model is established, the relation formula of dust control efficiency of gas-water nozzle is deduced, and the dust reduction efficiency curve is plotted by Matlab software. The results show that when the water flow rate is constant, the dust reduction efficiency increases with the increase of water flow rate, and then decreases with the increase of water flow rate. The larger the dust particle size is, the longer the effective distance of spray droplet is. In order to achieve the dust reduction efficiency of more than 80%, the gas flow rate must be more than 150 脳 10 ~ (-5) mm ~ (-5) m ~ (-3 / s), and the optimum air-water flow ratio is 100 ~ 150 ~ (-1). According to the particle size distribution and dust reduction efficiency of the working face, the best air-water flow rate can be selected according to the correlation curve, and the dust reduction effect and economic benefit can be achieved.
【作者单位】：教育部金属矿山高效开采与安全重点实验室(北京科技大学);
【基金】：国家自然科学基金(51274024,51574016) 中国博士后科学基金(2014M560891) 北京市自然科学基金青年科学基金(8164060)
【分类号】：TD714.4

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