综掘截割区域对尘-雾颗粒群逸散的影响规律研究

Study on influence law of cutting zone during fully mechanized excavation process on diffusion of dust-spray particles group

为掌握综掘机截割煤体动态过程对尘-雾颗粒群逸散的影响规律,对综掘工作面9个代表性截割区域的风流运移及尘-雾颗粒群逸散开展数值模拟研究,并拟合得到掘进司机位置尘-雾颗粒浓度与截割区域间的定量函数关系。研究结果表明:截割区域由压风侧底部沿“S”型路线移至抽风侧顶部,巷道流场紊动程度呈先增强、后减弱、再增强的规律;受截割断面转向流场及综掘机上部回流作用,掘进司机位置尘-雾颗粒浓度呈先降低、后增大、再降低、最终趋于稳定的规律。研究结果明确了截割区域对尘-雾群逸散的影响程度,可为综掘工作面实施精准防尘措施和实现可持续的安全生产提供理论指导。

In order to master the influence of the dynamic cutting coal process of fully mechanized excavation machine on the diffusion of dust-spray particles group,the numerical simulation research was carried out on the airflow migration and dust-spray particles group diffusion in nine representative cutting zones of fully mechanized excavation face,and the quantitative function relationship between the dust-spray particle concentration at the excavation driver’s position and the cutting zone was obtained by fitting.The results show that the cutting zone moves from the bottom of pressure side to the top of suction side along the“S”shaped route,and the turbulence degree of the roadway flow field presents a trend of increasing first,then weakening,and then increasing again.Due to the effect by the turning flow field of the cutting section and the back flow at the upper part of fully mechanized excavation machine,the dust-spray particles concentration at the excavation driver’s position decreases first,then increases,and then decreases,and finally tends to be stable.The research results clarify the influence degree of the cutting zone on the dust-spray group diffusion,and provide theoretical guidance for implementing accurate dust prevention measures and realizing sustainable work safety at the fully mechanized excavation face.