瓦斯输送管道内细水雾颗粒运动及沉积模拟研究

通过建立瓦斯气体流动模型、细水雾颗粒运动模型,在拉格朗日框架下对细水雾颗粒在瓦斯输送管道内的运动及沉积过程进行追踪。对数值模拟结果分析可知,混合流场在喷嘴两侧分别作顺时针、逆时针运动;细水雾颗粒沉积率在1.5m处达到最大值,在5m以后基本处于稳定状态。通过研究分析,为认识细水雾的运动及沉积规律,解决输送管道内喷嘴安装距离问题提供了一定的理论依据。

Simulation study on motion and deposition of fine water mist particles in gas conveyance pipelines

In recent years,with the rapid development of Chinese coal mining and processing technology,the safe protection system of fine water mist conveyance by low-density gas has been applied to actual production.But relative regulations about the two phase conveyance of gas and fine water mist were not rigorous enough,for example,the motion and deposition of the fine water mist in pipelines lacked of deep discussion.After building the gas flow model and motion model of fine water mist particles,the motion and deposition of fine water mist particles in gas conveyance pipelines were traced in Lagrange frame.The analysis results showed:the mixed flow field moved clockwise and counterclockwise on both sides of the nozzle;the deposition ratio reached the maximum at 1.5 m and tended to stable after 5 m.The study results offered some theoretical references for understanding the motion and deposition laws of fine water mist and determining the mounting distance of nozzle in conveyance pipelines.