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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。
Fully mechanized mining face is an important underground dust pollution sites. For press-in ventilated fully mechanized mining face, the distance of the press-in duct from the driving head is a very important working parameter. How to increase the dust reduction rate within the effective distance is also worth studying. The mathematical model of gas-solid two-phase flow was used to study the dust migration in the heading face. The discrete model (DPM) based on the Eulerian-Lagrangian method was used to simulate the dust movement in the gas field. Using the three-dimensional model, with the aid of the fluid mechanics software Fluent, numerical simulation was conducted on the law of dust migration when the press-in type duct of fully mechanized digging face was at different distance from the driving head. After analyzing the wind speed cloud chart, dust particle trajectory and escape statistics when the outlet of the hairdryer is different from the driving head, it is found that when the outlet air velocity of the air duct is 12 m / s, the distance from the exit of the air duct to the driving head is 5 ~ 10 m And the dust removal effect is better. When the fully-mechanized excavator is installed on the dust-proofing board, the distance between the outlet of the hair dryer and the driving head is more suitable at the distance of 5 to 8 m, and the dust particles transported to the driver at the same distance are Significantly reduce the dust control effect is better. The field application results show that when the distance between the outlet of the press-in type air duct and the coal wall of the working face is 6.0-8.5 m, the dust mass concentration at the driver of the fully-mechanized digging machine after the installation of the dust-proofing plate reduces the dust-holding rate by 21%, and the effect is good.