高溜井卸矿冲击气流影响因素的相似理论与实验研究

发布时间：2018-12-14 08:25

【摘要】：高溜井卸矿过程中产生的冲击气流是卸矿硐室及其附近巷道产尘的主要原因,通过分析冲击气流产生的基本方程,根据相似原理,导出了高溜井卸矿冲击气流的相似准则数,以李楼铁矿24#卸矿溜井为原型,建立了高溜井的相似模型,并对不同卸矿条件下的冲击气流进行了实验研究。结果表明:冲击风速随卸矿流量的增加而增加,但其增幅随卸矿流量增加而减小,最大冲击风速与卸矿流量成近似幂函数关系,且卸矿高度越大,幂指数越大,实验得幂指数范围为0.593~0.732;卸矿高度越高冲击气流越大,且随着卸矿高度的增加,矿石颗粒分散的空间越大,颗粒间相互作用越小,对溜井内气流的诱导作用越大,冲击气流增加的幅度随卸矿高度的增加不断提高;矿石粒径范围及出口阻力系数越大冲击气流越小;同时卸矿的中段越多,冲击气流会产生叠加而增大,但远小于各中段单独卸矿产生冲击气流的总和。
[Abstract]:The main cause of dust production in unloading cavern and nearby roadway is the impingement flow produced during unloading of high pass well. By analyzing the basic equation of impingement airflow, according to the similarity principle, the similarity criterion number of impingement airflow in high pass well unloading is derived. The similar model of high pass well is established based on 24# unloading well of Lilou Iron Mine, and the impact airflow under different unloading conditions is studied experimentally. The results show that the impact velocity increases with the increase of the discharge rate, but decreases with the increase of the discharge rate. The maximum impact velocity has an approximate power function relationship with the discharge rate, and the higher the unloading height, the greater the power exponent. The experimental results show that the power exponent is in the range of 0.593n 0.732. The higher the unloading height, the greater the impact flow, and with the increase of unloading height, the larger the dispersion space of ore particles and the smaller the interaction between particles, the greater the inducement of airflow in the slide well. The increasing amplitude of impingement flow increases with the increase of unloading height. The larger the ore particle size range and outlet resistance coefficient, the smaller the impact airflow, and the more the middle section of ore unloading, the larger the impact airflow will be, but much smaller than the sum of the impact airflow produced by the ore unloading alone.
【作者单位】：北京科技大学土木与环境工程学院;华北科技学院安全工程学院;
【基金】：国家自然科学基金(51574016) 北京市自然科学基金青年科学基金(8164060) 中央高校基本科研业务费专项资金(FRF-TP-15-038A2)
【分类号】：TD521.1

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