立式砂仓断面积和高度研究及应用

基于室内实验、集料供排平衡理论、流体动力学理论,提出立式砂仓断面积和高度的计算模型.断面积计算模型的核心是有效沉降速度,通过沉降规律分析,提出有效沉降速度为干涉沉降结束时液面下降高度与沉降时间之比.高度计算模型由压缩层、沉降层、溢流层、储砂空间和稳定放砂高度组成,核心是压缩层高度计算,应用流体动力学理论提出压缩层高度和砂浆浓度的关系式.以某矿立式砂仓为例,计算得到立式砂仓直径D为10 m,砂仓高度H为26.5 m.现场试运行结果表明:砂仓底流体积分数可达44%(质量分数69%),溢流水体积分数控制在3%以下,浓缩效果良好.

Study on the Sectional Area and Height of Vertical Sand Silo and Its Application

Based on indoor experiments， aggregate balance theory and fluid dynamics theory， mathematical models of vertical sand silo area and height were established. The core of sectional area calculation model is the effective sedimentation velocity which is equal to the ratio of the descent height of the liquid level and the sedimentation time. The height calculation model consists of compression layer， sedimentation layer， overflow layer， reserving sand space and stable sand height. Because the calculation of the compression layer height is the key part in the model， an equation on compression layer height and mortar concentration was put forward. Then this method was applied to a vertical sand silo. It was got that the diameter of the vertical sand silo is 10m， and the height of vertical sand silo is 26.5m. The field operation trial showed that the bottom flow volume fraction of sand silo can reach 44% (the mass fraction is 69%) and the volume fraction of over-flow water can be controlled under 3%， which means the concentration effect is very well.