伴有滑动床的粗颗粒石膏矿石浆体流动速度分布初探

发布时间：2018-01-15 13:44

本文关键词：伴有滑动床的粗颗粒石膏矿石浆体流动速度分布初探　出处：《泥沙研究》2017年04期 　论文类型：期刊论文

【摘要】：随着浆体管道输送工程的应用和发展,输送颗粒的粒径越来越大,伴有滑动床流动的粗颗粒浆体的输送工程越来越多。基于滑动床以上的悬浮层内的剪切应力呈线性分布的假设,提出了最大流速点(即剪应力最小点)位置的计算公式。在最大流速点至管道内任意点方向应用流速亏损定律,给出了悬浮层内任意点速度分布的计算模型。通过石膏矿石浆体管道输送试验,给出了若干组浓度分布、速度分布实验数据。通过若干组数据的回归分析,给出了最大速度值的计算公式及卡门常数值。利用试验数据,对最大速度点位置计算公式和滑动床上速度分布的计算模型进行了检验,其计算值和实测值的最大偏差分别为3.8%和14.3%。
[Abstract]:With the application and development of slurry pipeline transportation engineering, the particle size of transport particles becomes larger and larger. There are more and more transportation projects of coarse granular slurry with sliding bed flow. Based on the assumption that the shear stress in the suspension layer above the sliding bed is linear distribution. A formula for calculating the position of the maximum velocity point (i.e. the minimum shear stress point) is presented. The law of velocity depletion is applied in the direction from the maximum velocity point to any point in the pipeline. The calculation model of velocity distribution at any point in suspension layer is given. Through the pipeline transportation test of gypsum ore slurry, the experimental data of several groups of concentration distribution and velocity distribution are given, and the regression analysis of several sets of data is given. The calculation formula of maximum velocity value and the constant value of Carmen are given. The formula of maximum velocity point position and the calculation model of velocity distribution on sliding bed are tested by using the experimental data. The maximum deviations between the calculated values and the measured values are 3.8% and 14.3, respectively.
【作者单位】：辽宁工程技术大学矿业学院;中煤科工集团武汉设计研究院有限公司管道输煤所;
【基金】：中国煤炭科工集团有限公司青年基金项目(2014QN040)
【分类号】：U171
【正文快照】： 金属矿山和非金属矿山的矿石和尾矿、火力发电厂的灰渣、洗煤厂的粉煤、坑内开采的充填尾砂、水利工程的泥沙、深海的粗颗粒矿石物料输送等问题,均涉及到管道水力输送技术。矿物物料在管道中的运动状态可以分为:堆积层运动、部分堆积层运动、滑动层运动、完全悬浮和拟均质流运

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