摘要
为了研究大颗粒浆体在管道中的运动规律,通过对大颗粒的受力情况进行计算和分析,发现大颗粒运动过程中存在额外作用力,提出了采用修正系数K来描述该作用力的研究方法。通过数据拟合,给出了水平管道修正系数K的表达式。在此基础上,结合固体颗粒受力平衡方程和清水、固体颗粒动量方程、清水管内流速度分布公式,给出了水平管道大颗粒悬浮时浆体速度分布和滑移速度计算模型。模型计算结果与实测结果的对比表明,速度分布实测值和模型计算值的偏差均小于3%,且考虑修正系数K后,清水速度相对增大,固体颗粒速度相对变小;液固滑移速度计算值相对增大,其与实测值的偏差均小于10%,且更加接近实测值。
Through analysing the forces acted on large particle in pipe, investigate the flow law for large panicle slurry in pipe. The results show that, there are additional force acted on particle, which can be described by modified coefficient K. Through data fitting calculation method, provide the expression of modified coefficient K in horizontal pipe. Through equilibrium equation of force on particle, moment equations for water and solid particle, water velocity distribution formula in pipe, design velocity distribution model and slip velocity model for large particle slurry when solid panicle is in suspension. Comparison of model calculating result and experiment result show that the maximum deviation between calculated values by model for velocity distribution and experimental values is less than 3 percent. Considering the coefficient K, calculation values of water velocity increase, calculation values of solid velocity reduce. The model calculating result of slipping calculated values and experimental values is less than lO experimental values. velocity increase, and maximum deviation between model percent, and the calculation values is much closer to the
出处
《洁净煤技术》
CAS
2013年第3期116-119,共4页
Clean Coal Technology
关键词
浆体
速度分布
大颗粒
水平管道
滑移速度
slurry
velocity distribution
coarse particle
horizontal pipe
slip velocity
