管径对全尾砂充填料浆管道输送特性影响研究

发布时间：2018-06-30 21:58

  本文选题：管径 + 全尾砂　； 参考：《华北理工大学》2015年硕士论文

【摘要】：地下充填开采能力的提高要求充填输送管道直径和料浆浓度的增大,导致料浆在管道内的输送特征发生改变。研究管径对充填料浆管道输送特征的影响规律,对提高矿山充填料浆管道输送能力和稳定性有积极的意义。采用Fluent-3D工程流体力学软件,研究了满管输送充填料浆时管径对管道横断面上料浆流速分布与浓度分布的影响。研究结果认为,充填料浆在管道内满管流动时,可以将管道横断面分为浓度降低区、均质浓度区和浓度升高区;在其它条件相同的情况下,增大管径可以提高均质流动区域在管道横断面上的比例,但管径的增大会进一步增大浓度升高区的料浆浓度,减小浓度降低区的料浆浓度;在管道横断面上,随着管径的增大,满管输送初速度相同的充填料浆在管道横断面上的流速梯度减小。采用理论分析、物理试验和数值分析相结合的方法,分析了不同浓度充填料浆的流变特性,推导出使输送阻力损失最小的临界输送流速计算模型,研究了管径对临界输送流速的影响;结合矿山充填倍线、料浆流变参数等影响因素,研究了管径对临界输送浓度的影响关系。研究结果认为使输送阻力最小的临界输送流速与管径成幂函数线性增大的关系,即0.379c iV?AD(A??0.26,0.50?);临界输送浓度随管径呈现对数增大的关系,即()w iC?m Ln D?t。采用Fluent-3D工程流体力学软件,模拟研究了不同充填倍线和料浆浓度条件下管径对输送阻力损失的影响。研究结果认为,随着管径的增大,输送阻力损失呈指数减小的变化关系,相关关系为0.01D pi?e??;在不同充填倍线条件下,管径对输送阻力损失的影响关系不改变;充填料浆浓度越高,充填料浆输送阻力损失随管径的变化率越大;随着管径的增大,管径对输送阻力损失的影响逐渐趋于平缓,增大管径可以有效降低浓度对输送阻力损失的影响,说明大直径管道输送高浓度料浆是可行的。
[Abstract]:The increase of underground filling mining capacity requires the increase of the diameter and slurry concentration of the filling conveying pipeline, which results in the change of the transport characteristics of the slurry in the pipeline. It is of positive significance to study the influence of pipe diameter on the transport characteristics of filling slurry pipeline and to improve the transport capacity and stability of mine filled slurry pipeline. The influence of pipe diameter on the velocity distribution and concentration distribution of slurry on the cross section of pipeline was studied by Fluent-3D engineering fluid dynamics software. The results show that the cross section of the pipe can be divided into three regions: concentration reduction zone, homogeneous concentration zone and concentration increasing zone when the filling slurry flows through the pipe. Under the same conditions, the cross section of the pipe can be divided into three parts: the concentration reduction zone, the homogeneous concentration zone and the concentration increasing zone. Increasing the diameter of the pipe can increase the proportion of the homogeneous flow area on the cross section of the pipeline, but the increase of the diameter of the pipe will further increase the concentration of the slurry in the area of increasing concentration, and decrease the concentration of the slurry in the area of concentration reduction, and on the cross section of the pipeline, with the increase of the diameter of the pipe, The velocity gradient of the filling slurry with the same initial velocity decreases on the cross section of the pipeline. By combining theoretical analysis, physical test and numerical analysis, the rheological characteristics of filling slurry with different concentrations are analyzed, and the critical flow rate calculation model is derived, which minimizes the loss of transportation resistance. The influence of pipe diameter on critical transport velocity is studied, and the influence of pipe diameter on critical transport concentration is studied in combination with the influence factors of mine filling doubling line and slurry rheological parameters. The results show that the critical conveying velocity with the minimum conveying resistance increases linearly with the power function of pipe diameter, that is, AD (0.379c) and critical transport concentration increases logarithmically with the diameter of the pipe, that is, () w iCm Ln DnDt. Fluent-3D engineering fluid dynamics software was used to simulate and study the influence of pipe diameter on conveying resistance loss under different filling doubling lines and slurry concentration. The results show that with the increase of pipe diameter, the resistance loss decreases exponentially, the correlation is 0.01D pipette, the influence of pipe diameter on transport resistance loss is not changed under different filling doubling lines, the higher the slurry concentration, the higher the slurry concentration. With the increase of pipe diameter, the influence of pipe diameter on conveying resistance loss tends to be gentle, and increasing pipe diameter can effectively reduce the influence of concentration on conveying resistance loss. It shows that it is feasible to transport high concentration slurry in large diameter pipeline.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD853.34
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本文编号：2086981