粗颗粒浆体管内速度分布及水力坡度的研究

发布时间：2018-12-09 07:53

【摘要】：随着浆体管道输送工程的应用范围越来越广泛,为了使物料的碾磨和脱水工艺简单化,输送物料粒径在逐渐增大,粗颗粒浆体的平均粒径已超过0.2mm。粗颗粒浆体管道内运动规律研究是一个十分重要的课题,而管道内固体颗粒受力情况、浆体在管道内的速度分布以及水力坡度是其中的几个主要方面。论文从粗颗粒浆体固体颗粒在管道中的受力平衡关系出发,深入研究粗颗粒浆体固体颗粒在管道中流动时,由于固体颗粒间的相互作用所形成的在固体颗粒运动方向上的阻力。在此基础上,提出了修正干涉力的概念及计算模型,并对修正干涉力模型中的系数K进行非线性拟合。然后,从固体颗粒与清水作用过程中发生动量传递关系出发,建立液、固两相间的滑移速度模型、粗颗粒浆体的速度分布模型和水力坡度模型,并采用大量的实验数据进行验证。研究结果表明：本文建立的修正干涉力计算模型,正确地反映了粗颗粒浆体颗粒受力情况。滑移速度模型、速度分布模型及水力坡度模型能精确地预计粗颗粒浆体的滑移速度、速度分布及水力坡度,且精度符合要求。
[Abstract]:With the application of slurry pipeline transportation engineering more and more widely, in order to simplify the milling and dehydration process, the particle size of the conveying material is gradually increasing, and the average diameter of coarse particle slurry has exceeded 0.2 mm. It is a very important subject to study the motion law of coarse granular slurry in pipeline. The stress of solid particles in pipeline, the velocity distribution of slurry in pipeline and the hydraulic gradient are the main aspects. In this paper, starting from the force balance relation of coarse granular slurry solid particles in the pipeline, the resistance of solid particle movement in the direction of solid particle movement due to the interaction between solid particles is deeply studied when the coarse granular slurry solid particle flows in the pipeline. On this basis, the concept and calculation model of modified interference force are put forward, and the coefficient K in the modified interference force model is nonlinear fitted. Then, starting from the momentum transfer between solid particles and clear water, the slip velocity model between liquid and solid phases, the velocity distribution model of coarse particle slurry and the hydraulic gradient model are established. And a large number of experimental data are used to verify. The results show that the modified interference force calculation model presented in this paper correctly reflects the force of coarse granular slurry. The slip velocity model, velocity distribution model and hydraulic gradient model can accurately predict the slip velocity, velocity distribution and hydraulic gradient of coarse granular slurry, and the accuracy meets the requirements.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD50

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