掘进工作面多层螺旋喷雾降尘技术研究

Research on multi-layer spiral spray dust removal technology in heading face

为解决掘进工作面呼吸性粉尘的污染问题,提出一种将超声速气动喷嘴布置成螺旋状的多层喷雾降尘方法。以棋盘井煤矿掘进工作面为研究对象,采用离散元和有限元方法,通过COMSOL软件中的k-ω湍流模型和流体流动颗粒跟踪模型,建立多层螺旋喷雾降尘技术装置三维数值模型,得出了多层螺旋喷雾风流速度场,速度切面和水雾粒子轨迹的变化规律。模拟结果表明:掘进机截割头处风流速度较快,距离截割部越远,风流的速度越小,且截割头附近的风流非常紊乱;水雾粒子在喷嘴开启后会形成多层螺旋雾幕,20 s后螺旋雾幕覆盖到整个模拟的掘进工作面,且水雾粒子的粒径相较传统喷雾方法更小。

In order to solve the problem of respirable dust pollution in the heading face,a multi-layer spiral spray dust removal method was proposed,in which supersonic pneumatic nozzles were arranged in a spiral shape.Taking the heading face of Qipan Coal Mine as the research object,the three-dimensional numerical model of multi-layer spiral spray dust removal technology device was established by using discrete element and finite element method and k-ωturbulence model and fluid flow particle tracking model in COMSOL software.The velocity field of multi-layer spiral spray air flow,velocity section and trajectory of water mist particles were obtained.The simulation results show that the airflow velocity at the cutting head of the TBM is faster,the farther away from the cutting head,the smaller the airflow velocity,and the airflow near the cutting head is very disorganized;after the nozzle is opened,the water mist particles will form a multi-layer spiral fog curtain,and the spiral fog curtain will cover the entire simulated driving surface after 20 s,and the particle size of the water mist particles is smaller than that of the traditional spray method.