【作者】 赵利安；

【导师】 许振良；

【作者基本信息】 辽宁工程技术大学 ， 采矿工程， 2011， 博士

【摘要】 近年来,越来越多的管道输送工程涉及到大颗粒(粒径0.2mm以上)物料的管道输送技术。大颗粒浆体滑移速度、速度分布、水力坡度(摩阻损失)和浓度分布是浆体管道输送技术研究的重要内容。到目前为止,只有少数专家和学者对这些方面进行了细致的试验和研究。这些研究成果大致可分为三类,即:试验研究结果、理论研究结果和结合实验取得的理论结果。这些研究成果都没有阐明大颗粒浆体管道中液体(清水)与大粒径固体颗粒互相作用这一关键问题。此外,有些研究成果只能应用于特定环境下,缺乏广泛应用价值。因此,有必要展开大颗粒浆体管内流动规律的深入研究。本文从研究大粒径固体颗粒在管道中流动时的受力平衡方程入手,发现大粒径固体颗粒在管内流动时,存在额外阻力。由此提出用干涉力修正系数确定大粒径固体颗粒运动阻力的方法,并采用有关专家学者的大量试验数据,通过非线性拟合,给出大粒径固体颗粒干涉力修正系数的计算公式。在此基础上,从固体颗粒和清水动量传递关系角度,分析和研究大颗粒浆体滑移速度、速度分布和水力坡度(摩阻损失),并提出各自计算的新模型。最后,在前面提出的确定大粒径固体颗粒运动阻力的基础上,利用大颗粒垂直管道轴线方向上受力平衡关系,提出大颗粒浆体浓度分布计算模型,并在相关学者研究的基础上,通过理论分析,提出固体颗粒扩散系数的计算方法。伴有滑动床的浆体流动是一种特殊的管道输送方式,在前人研究成果基础上,提出管道内滑动床上方的浓度分布规律的计算模型。论文中采用相关的试验数据对所提出的浆体滑移速度、速度分布和水力坡度(摩阻损失)以及浓度分布模型进行了验证,并分析了干涉力修正系数对滑移速度、固体颗粒速度分布、清水速度分布和水力坡度(摩阻损失)的影响。此外,对模型计算结果与实测结果之间的偏差产生原因也进行了简单分析。更多还原

【Abstract】 In recent years, more and more slurry pipeline project involves the technology of transporting large particle(particle size more than 0.2 mm) materials. Research on sliding velocity, velocity distribution, hydraulic gradient(friction loss) and concentration distribution is important content in slurry pipeline technology. So far, detail experiment and research are carried out by only a few scholars and experts in these respects. These research fruits can be roughly divided into three types: experimental study results, theoretical study results and synthetical results of experiment and theory. These research fruits fail to clarify the key problems of liquid (water) and solid particles interaction in large particles slurry pipe. In addition, some research results can only be used in certain circumstances, and they lack of wide application value. Therefore, it is necessary to launch the intensive study of large particles slurry flow law in pipeline.Starting with large particles’force balance equation, it is found that there exists extra resistance when large particle flows in pipeline. So the method of using interference force’s correction factor to study large particles’motion-resistance force is put forward. And a lot of experts’experimental data are used, through nonliear fitting method, and calculation formula of interference force’s correction coefficient is given out. And based on this, sliding velocity between water and solid particle, velocity distribution and the hydraulic gradient(friction loss) are analysed and studied from the standpoint of momentum transmission relationships, and new calculation models of sliding velocity, velocity distribution and the friction loss are put forward. At last, on the basis of large particle motion resistance proposed above, using particle’s force balance relationship in the vertical axis direction, concentration distribution calculation model is put forward, and on the basis of relevant study, using theoretical analysis, calculation method of solid particles’diffusion coefficient is given out. Slurry flows with a sliding bed is a special kind of pipeline transportation mode and based on the previous research achievement, calculation model of concentration distribution law above sliding bed is brought forward.The calculating model of sliding velocity, velocity distribution, hydraulic gradients(friction loss) and concentration distribution in this thesis are verified by the related experimental data and the influence of interference force’s correction coefficient on sliding velocity, velocity distribution, hydraulic gradients(friction loss) is is analyzed. Furthermore, the error reasons between author’s calculated value and measured value are analyzed too.更多还原