综掘工作面压入式风筒出口有效距离研究  

On the effective range of the outlet from the flowing ventilation to the mechanized excavation face

作　　者：张大明[1] 马云东[2] 罗根华[3] 

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]大连交通大学土木与安全工程学院,辽宁大连116028 [3]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000

出　　处：《安全与环境学报》2016年第4期186-191,共6页Journal of Safety and Environment

基　　金：国家自然科学基金项目(U1261121;51274116)

摘　　要：综掘工作面是井下粉尘的重要污染场所。对压入式通风综掘工作面而言,压入式风筒出口距掘进头的距离是一个非常重要的工况参数。如何在有效距离范围内提高减尘率也是一项值得研究的工作。采用气固两相流数学模型来研究掘进工作面的粉尘运移规律,采用基于欧拉-拉格朗日法的离散型模型（DPM）模拟粉尘在气场中的运动。采用三维立体模式,借助流体力学软件Fluent对综掘工作面压入式风筒出口距掘进头不同距离时的粉尘运移规律进行数值模拟。综合分析风筒出口距掘进头不同距离时的风速云图和粉尘粒子轨迹及其逃逸统计后发现,在风筒出口风速为12 m/s时,风筒出口距掘进头距离在5~10 m较合适,排尘效果较好;而综掘机安装上挡尘板后,风筒出口距掘进头距离在5~8 m较合适,且同距离情况下,运移到司机处的粉尘粒子较之前明显减少,控尘效果较好。现场应用结果表明,当压入式风筒出口距工作面煤壁距离为6.0~8.5 m时,安装挡尘板后综掘机司机处的粉尘质量浓度减尘率达21%,效果良好。The article is engaged in a simulated study on the effective range of the outlet from the flowing ventilation to the mechanized mining face in view of the problem of dust pollution in the fully mechanized working face. In the article,we have studied the dust motion regularity in the fully mechanized heading face with the different ranges from the blowing duct outlet to the heading face. For our research purpose,we have made simulated research with the dust motion regularity in a three-dimensional state with the method of the Euler Lagrange discrete model（ DPM） via a software named CFD Fluent. The author has made an analysis of the dust particle moving trajectory with the statistics data tracing of the dust escaped through the comprehensive velocity contour. The simulation results indicate that the air jet spread section tends to be formulated with the wind duct outlet being 5 m from the working face,whereas on the other side of the tunnel there would only a very small vortex zone formed. At the same time,in a range of 8 m from the heading face,another section of the air jet expansion would begin to form in front of the wind duct outlet in a reversed direction under the air suction,with two smaller vortex zones being formed at each side of the tunnel. Besides,in a range of 10 m from the working face,a jet expansion section and a jet contraction section would be formed,and so would a smaller zone be formed on the interface of the jet zone and the recirculation zone under the air suction. When 12 m from the heading face,a low velocity zone tends to be resulted at the corner of the tunnel under the air suction,and a smaller vortex zone is also formed at the interface of the jet zone along with a recirculation zone at the driver place of the excavationgging machine. When the wind duct is 5 m and 8 m from the heading face after installing a dust blocking board on the digging machine,a very small vortex zone is formed in front of the tunnel and the dust blocking board can help to divide the working face into two rel

关 键 词：安全工程 压入式通风 综掘工作面 有效射程 数值模拟 

分 类 号：X773[环境科学与工程—环境工程]