综放工作面转载破碎粉尘扩散运移规律分析

Dust diffusion and migration law of transferring and crushing point in fully mechanized coal caving face

为了分析综放工作面转载破碎粉尘的扩散运移规律,根据进风巷实际情况建模并利用FLUENT软件进行数值模拟。结果表明:综放工作面进风巷内的主要产尘点位于转载机机头1m处和破碎机防护罩周围,且高浓度粉尘主要集中于离地面1m左右;转载点处粉尘中心尘源的粉尘浓度较高,起尘高度约为0.5m左右,因此喷雾降尘时雾滴须有针对性。破碎机防护罩周围粉尘呈层状分布,从地面向上粉尘浓度逐渐降低,缝隙处逸出的粉尘远小于转载点产生的粉尘;整体上,进风巷内从转载机机头1m处开始起尘,到破碎机与机头中部,在防护罩下方形成高浓度粉尘区域,于破碎机处粉尘浓度又达到极大值,最后在转载机机尾处粉尘扩散基本趋于稳定,粉尘治理时可根据不同位置调整喷雾系统的喷雾参数。

In order to analyze the diffusion and migration law of transferring and crushing dust in fully mechanized coal caving face,a numerical model was built according to the actual situation of the intake airflow roadway and the numerical simulation was carried out by FLUENT software. The results show that the main dust producing points in the intake airflow roadway of the fully mechanized coal caving face are at 1 m of the reversed loader head and around the protective cover of the crusher,and the high concentration of dust is mainly concentrated at about 1 m above the ground. The dust concentration in the dust center at the transfer point is high,and the dust rising height is about 0. 5 m. Therefore,the mist drops must be targeted when spraying for dust removal. The dust around the crusher protective cover is distributed in layers,and the dust concentration gradually decreases from the ground up. The dust escaping from the gap is far less than the dust generated at the transfer point. Overall,the dust starts up at 1 m of the reversed loader head in the intake airflow roadway,and a high concentration of dust is formed at the bottom of the protective cover at central of the crusher and the reversed loader head. The dust concentration reaches the maximum at crusher,and the dust diffusion tends to be basically stable at the tail of the reversed loader finally. Therefore,the spray parameters of the spray system can be adjusted according to different positions during dust control.