散料颗粒密相气力输送动力参数优化及压降特性分析

Optimization of Pneumatic Conveying Kinetic Parameters of Powder Particles and Analysis of Pressure Drop Characteristics

为了降低管内压降,减小散料颗粒群非均匀悬浮输送所产生的湍流强度,以欧拉双流体模型为基础,应用流体力学Fluent仿真软件,建立粘度系数μ_s,k_(in)、曳力系数β在Syamlal-O’Brien和Gidaspow两种模型下形成的4种组合模型,并与实验结果进行对比,选出Gidaspow与Gidaspow组合模型作为气力输送计算模型,进而分析影响输送过程中压降变化的主要动力参数:粘度系数、曳力系数和碰撞恢复系数e_(ss),探讨前两者在该模型组合时管内压力的分布规律,得出碰撞恢复系数和入口风速v_g对管内压降变化特性的影响。

For purpose of reducing the pipe pressure drop and decreasing the turbulence intensity incurred by conveying the powder particle group in inhomogeneous suspension,through basing on the Eulerian two-fluid turbulence model,applying Fluent software and establishing 4 combined models of viscosity coefficient (μs,kin) and drag coefficient (β) in Syamlal-O’Brien and Gidaspow models was implemented and compared with the experimental results,including having Gidaspow-Gidaspow model taken as the pneumatic transmission model to analyze such kinetic parameters as viscosity coefficient,drag coefficient and restitution collision coefficient(ess). Through discussing the distribution rule of the pipe pressure when analyzing both viscosity coefficient and drag coefficient in the Gidaspow-Gidaspow model,the effects of restitution collision coefficient and inlet velocity (vg) on the change characteristics of pressure drop in the pipe were obtained.