【摘要】 为阐明进气方式对气力提升特性的作用规律,以普通河沙模拟井下矿层,利用小型输沙系统实验研究在恒定浸入率和供沙量下气孔数量与进气角度对扬水量、扬沙量及总效率的影响。结果表明:任一进气方式下扬水量、扬沙量及总效率并不随气量值增加呈现单调特性,前两者峰值所处位置大致接近,且较总效率峰值对应点右移。气孔数量和进气角度对扬水量及扬沙量影响较小,对总效率影响程度稍大。就整体而言,对应气孔数量和进气角度分别为4和90°时其扬沙量与总效率较其它进气方式上扬。另外,实验测得最高扬沙效率所对气相佛汝德数大致相同,约为2.5,且最佳扬沙效率所对应的气相佛汝德数随管径递增。更多还原

【Abstract】 To clarify the mechanism and action of air injection method on air lift characteristics,the river sand was simulated as underground ore bed,the effects of stomata numbers and injection angles on water flux,mass flow rate of solids and overall efficiency are studied experimentally at a given constant submergence ratio and solid particles are supplied by using small sediment transport system.The results are as follows: the water flux,mass flow rate of solids and overall efficiency showed no monotonicity with the increase in the air flow rate under any air injection method;the positions for peak values of the former two were nearly close and moved to a right shift compared with those of overall efficiency.The stomata numbers and injection angles have a little influence on water flux and mass flow rate of solids,being slightly disadvantageous over overall efficiency.Taken as a whole,the curve lines,which correspond to the stomata number and injection angle of 4 and 90° respectively,are higher compared with other air injection methods.In addition,the gas Froude numbers corresponding to the efficiency of lifting solids are all close to 2.5 under any operation conditions and increase with the increase in the inner diameter of a lifting pipe.更多还原