蒋仲安,王亚朋,王九柱.高溜井卸矿气流诱导粉尘污染研究[J].湖南大学学报:自然科学版,2019,(12):114~123
高溜井卸矿气流诱导粉尘污染研究
Studies on Dust Pollution Induced by High-ore Pass Unloading Airflow
  
DOI:
中文关键词:  高溜井  粉尘扩散  冲击气流  相似准则  高速摄影
英文关键词:high-ore pass  dust-diffusion  impinging airflow  similar criteria  high-speed photography
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作者单位
蒋仲安,王亚朋,王九柱 (北京科技大学 土木与资源工程学院北京100083) 
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中文摘要:
      为掌握金属矿山高溜井卸矿风流及粉尘的时空变化规律,采用相似原理推导出了高溜井卸矿气流及粉尘的相似准则数,以相似准则数为基础建立了溜井相似实验模型,并通过相似实验及数值模拟对不同卸矿流量、不同矿石粒径及不同卸矿高度下溜井内气流变化、粉尘运移规律进行研究. 研究结果表明:溜井第一中段卸矿时,第一、二中段井口压差为负,第三、四中段压差为正;三、四中段有粉尘被卸矿气流带出,为溜井主要产尘点;随卸矿流量的增加,产尘点的风速及粉尘浓度呈现出先增加后减少的规律,卸矿流量为1.0 kg/s时风速及产尘量最大;卸矿流量不变时,产尘点的风速与矿石粒径呈反比,粉尘浓度与矿石粒径为幂函数关系,指数最大值为-0.63;卸矿流量及矿石粒径不变时,卸矿高度越大产尘点的风速及粉尘浓度越大.
英文摘要:
      In order to grasp the temporal and spatial variation of unloading airflow and dust in high ore pass in metal mines,the similarity criterion of high ore pass unloading airflow and dust was derived by similar principle. The similar experimental model of the ore pass was established based on the similarity criterion. Experiments and numerical simulations were carried out to study the airflow changes and dust migration laws under different unloading flow rates,different ore sizes and different unloading heights. The results show that when the first middle section of the ore pass is unloading,the differential pressure at the wellhead in the first and second middle sections is negative,and the pressure difference in the third and fourth middle sections is positive; in the third and fourth middle sections,the dust is discharged by the unloading airflow,which is the main dust-producing point of the ore pass; with the increase of the unloading flow,the wind speed and dust concentration of the dust-producing point show a law of increase first and then decrease,and when the unloading flow is 1.0 kg/s,the wind speed and dust production are the largest; When the unloading flow rate is constant,the wind speed of the dust-producing point is inversely proportional to the ore particle size. The dust concentration and ore particle size are in a power function relationship,and the maximum index is -0.63; When the unloading flow rate and ore particle size are constant,the greater unloading height results in the greater wind speed and dust concentration of the dust-producing point.
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