煤矿井下气水喷雾雾化特性及降尘效率理论研究

为分析煤矿井下气水喷雾雾化特性及降尘效率,借助流体力学、多相流及气溶胶等相关理论,对气水喷雾雾化特性与喷雾降尘效率进行了全面的理论研究。根据流体力学与多相流相关理论,建立了求解空气雾化喷嘴气、液质量流量的完整方程组,并给出了雾化粒径和雾滴速度的计算公式;通过建立煤矿井下气水喷雾降尘数学模型,推导出分级效率的理论计算式,并采用Origin软件绘制出分级效率与供气流量、供水流量及粉尘粒径的关系曲线;同时,结合粉尘粒径和频率分布式,建立了全尘降尘效率与呼吸性粉尘降尘效率的理论计算式,并分析了粉尘中位径及粒径分布指数对降尘效率的影响。

Theoretical research on atomization characteristics and dust suppression efficiency of air-water spray in underground coal mine

In order to analyze the atomization characteristics and dust suppression efficiency of air-water spray in underground coal mine，the atomization characteristics and dust suppression efficiency of air-water spray were theoretically investigated in a systematical way based on fluid dynamics，multiphase flow and aerosolology.Based on the theories of fluid dynamics and multiphase flow，a complete equation set of nozzle flow rate was derived，and the formulas for calculating the size and velocity of droplet were provided.The theoretical calculating formula of classification efficiency was derived by establishing the mathematical model of air-water spray dust-setting，and the relationship curves between classification efficiency and influence factors were drawn using Origin software.At the same time，combined with the distribution formulas of particle size and frequency，the theoretical calculating formulas for calculating the dust suppression efficiencies of total dust and respirable dust were also established.At last，the influences of medium diameter and distribution index on dust suppression were analyzed.