井下粉尘分布规律实测研究

Study on distribution of underground dust

为研究井下粉尘分布规律,以某矿为研究对象,采用理论分析与现场实测相结合的方法,分析各尘源产尘特点及致因,运用校准采样器对井下综采工作面、掘进头、主运巷转载处、辅运大巷进行统筹性现场实测.研究结果表明:割煤机与掘进机司机处为最主要尘源,割煤机司机处总尘、呼尘增幅超过322.06%、266.82%,沉降区间为0~30 m;掘进机司机处总尘、呼尘浓度大于280.62 mg/m^(3)、82.66 mg/m^(3),沉降区间超过30 m;掘进头整体可视度不足8m,应为重点防治对象;主运巷转载机处总尘、呼尘增幅超过144.80%、128.50%,沉降区间为0~15m;辅运大巷平稳区域内呼尘占比为59.50%,主运巷转载荡尘和辅运大巷地面扬尘是新鲜风流携尘主要致因.井下沿风流从副斜井井口、绕道口深入至各工作面的空间内,粉尘浓度整体呈现“递增-激增-递减-平稳-回落”的运移规律.研究结论可为制定粉尘防控策略提供依据.

In order to study the distribution law of underground dust,a mine was used as the research object,and the characteristics and causes of dust production of each dust source were analyzed by combining theoretical analysis and field measurement Calibration sampler was used to carry out overall field measurement of fully mechanized mining face,driving face,the transfer place in main transport lane and the auxiliary transportation lane.The analysis results shows that the coal cutter and roadheader drivers are the main dust sources.The increase of total dust and respirable dust at the coal cutter drivers is more than 322.06%and 266.82%,and the settlement range is 0~30 m.The total dust and dust concentration at the driver of the roadheader is greater than 280.62mg/m^(3)and 82.66 mg/m^(3),and the settlement interval is more than 30 m.Overall visibility of heading head is less than 8 m,which should be the key prevention and control object;The total increase of dust and respirable dust at the transfer machine of the main conveyance roadway exceeds 144.80%and 128.50%,and the settlement range is 0~15 m.The proportion of dust in the stable area of the auxiliary conveyance roadway is 59.50%.The transfer of dust and respirable dust on the ground of the main conveyance roadway is the main cause of fresh air carrying dust.Along the wind flow,dust concentration penetrates into the space of each working face from the head of the secondary inclined shaft and the bypass shaft,showing a general migration rule of"increasing-increasingdecreasing-stabilizing-falling".The field measured data can provide a basis for the development of dust prevention and control strategy.