摘要
为了确保倾斜尾矿管道输送安全可靠运行,采用紊流扩散理论,在倾斜管道建立了扩散方程,提出了伴有滑动床的倾斜管道上层的颗粒垂线浓度分布模型。同时结合颗粒和清水质量守恒以及悬浮层浆体流动平衡条件,给出了滑动床厚度和垂线浓度分布的计算方法。在此基础上,通过分析滑动床受力平衡关系,给出了伴有滑动床流动的倾斜管道尾矿浆体淤积临界速度的迭代求解方法。通过水平及倾管道输沙试验,发现淤积临界流速与平均粒径和输送浓度负相关,实测淤积临界流速值与作者模型的计算值最大偏差不过超12%。
In order to promote the safe operation of tailing slurry in inclined pipeline, diffusion equation for inclined pipe was set up, and solid concentration distribution model perpendicular to flow direction for suspension layer with sliding bed at pipe bottom was put forward. At the same time, combined with mass conservation relationship of particles and water and suspended layer flow equilibrium condition, calculation methods of sliding bed thickness and the vertical concentration distribution were given out. On the basis of this, an iterative method was presented to solve the critical flow velocity for tailing slurry in inclined pipes with sliding bed by analyzing the force balance relation of the sliding bed motion for tailing particles. Through horizontal and inclined sand slurry pipe test, it is found that there exists a negative correlation for critical deposition velocity with average particle size and delivered concentration and maximum deviation between measured critical deposit velocity value and calculated value does not exceed 12%.
出处
《有色金属工程》
CSCD
北大核心
2017年第4期70-74,共5页
Nonferrous Metals Engineering
基金
中国煤炭科工集团科技创新基金资助(2014QN040)
关键词
尾矿浆体
淤积临界流速
滑动床
扩散方程
tailing slurry
deposit critical velocity
sliding bed
diffusion equation
