L型充填管道料浆输送压力损失及优化研究

全尾砂料浆管道输送作业中，料浆管道底部磨损问题比较严重，极大地影响了料浆管道的使用寿命。结合唐山某铁矿全尾砂料浆L型管道充填现状，以L型管道输送压力损失最小为原则进行研究，选择灰砂 比为1∶4、1∶6、1∶8，配比浓度为54%、58%、62%的充填料浆作为试验对象，以3、5、7 m/s为料浆流动速度，采用COMSOL Multiphysics数值模拟软件，基于3D数值模型计算了管道直径为70、80、90、100 mm 4种情 况下的压力损失，分析了压力损失的影响因素并进行了优化研究。结果表明：管道直径越大，45°截面的压力越大，L型管道压力损失与管道直径呈二次多项式函数关系，管道直径减小到70 mm或增大到100 mm，都会 加速L型管道底部的磨损。为延长矿山L型管道服务时间，最大限度减轻管道底部磨损，建议该矿山L型充填料浆输送管道直径取85 mm，料浆流速3 m/s，灰砂比1∶4，质量浓度64%。

Study on Pressure Loss and Optimization of L-shaped Filling Pipe Slurry

In the pipeline transportation of unclassified tailings slurry， the bottom of the slurry pipeline is worn out， which greatly affects the service life of the slurry pipeline. Based on the filling status of the L-shaped pipeline of a tailings slurry of an iron mine in Tangshan，the minimum pressure loss of L-shaped pipeline was taken as the principle to conduct study work.The filling slurry with the ratio of cement to sand ratio of 1∶4，1∶6，1∶8，slurry concentration was 54%，58%，62%，and the test was carried out at 3，5，7 m/s is the slurry flow rate.The pressure loss of the pipe diameters of 70，80，90，100 mm is calculated based on the 3D numerical model by using COMSOL Multiphysics numerical simulation software，besides that，the influence factors of pressure loss were analyzed and optimized.The study results show that the larger the diameter of the pipe，the greater the pressure of the 45° section，and the pressure loss of the L-shaped pipe is quadratic polynomial function；the diameter of the pipe is reduced to 70 mm or increased to 100 mm，which will accelerate the abrasion of the bottom of the L-shaped pipe.In order to extend the service time of the L-shaped pipeline in the mine and minimize the wear of the bottom of the pipeline，it is suggested that diameter of the L-shaped filling slurry conveying pipeline of the mine can be determined as 85 mm ，the slurry flow rate is 3 m/s，the cement-sand ratio is 1∶4 and the mass concentration is 64%.