某铁矿管道自流输送分析及管道磨损研究

对某铁矿充填系统的管流输送进行了输送参数确定及管道磨损研究，采用经验公式得出料浆临界流速及运输管道的临界管径，并运用Fluent进行数值模拟分析，找出料浆在输送过程中对输送管道磨损较为严重的部位。结果表明，铁矿料浆质量浓度62%~68%时，临界流速0.806~0.831 m/s、输送管道直径0.207～0.209 m条件下可实现自流输送；料浆流动过程中速度与压力最大值集中在管道中心线附近，但在各拐点处的管段料浆流速与压力会产生突增，且最大值在拐点内侧管壁；在拐点后一段管道内料浆流速与压力值先增大后减小，最大值由靠近下管壁逐渐回到管道中心线附近；整个输送管道中磨损较为严重的部位出现在弯管内侧及其接下来的一段管道的下管壁。

Analysis of Gravity Flow Pipeline Transportation and Pipeline Wear for an Iron Mine

The parameters of gravity flow transportation for a backfilling system in an iron mine and the pipeline wear were studied. The critical flow velocity of the slurry and the critical pipe diameter of the transportation pipeline were obtained by using an empirical formula. The numerical simulation analysis was performed with Fluent for finding out the parts seriously worn by the slurry during the transportation. The results show that for the slurry with mass concentration of 62%-68%, the critical flow velocity is 0.806-0.831 m/s and the transportation by gravity can be performed in the pipeline with diameter of 0.207-0.209 m. In the flowing process of the slurry, both the maximum flow velocity and maximum pressure mostly appear near the centerline of the pipeline, but the flow velocity and pressure of the slurry at each bend will increase sharply, with the maximum value appearing on the inside wall of bends. And both of them will increase followed by decrease at the section after the bends, with the maximum value gradually appearing from the area close to the lower pipe wall to the areas near the pipeline′s centerline. The severely worn parts are the inner side of the bends and the lower pipe wall of the following section.