基于颗粒缩放理论的垂直螺旋输送离散模拟

发布时间：2018-07-06 09:01

本文选题：颗粒缩放 + 垂直螺旋　；参考：《过程工程学报》2017年05期

【摘要】：利用相似理论和量纲分析进行颗粒缩放,将粒径0.5 mm的铸铁煤粉颗粒放大至2 mm,进行虚拟实验标定放大颗粒的基本接触参数,用离散单元模型模拟垂直螺旋输送中的颗粒运动,验证颗粒缩放法的准确性.结果表明,螺旋转速为500,550,600,650 r/min时,颗粒轴向速度和圆周速度增大,最大轴向速度位于中上部,处于叶片边缘,分别为0.486,0.535,0.596,0.657m/s,超过螺旋叶片半径区域的颗粒轴向速度明显减小;相同填充率下,装置出口处质量流率、颗粒轴向速度模拟值和实验值基本吻合,满足相似理论.
[Abstract]:By using similarity theory and dimension analysis, the particle size of cast iron pulverized coal is enlarged to 2 mm, and the basic contact parameters of the amplified particle are calibrated by virtual experiment. The particle motion in vertical spiral conveying is simulated by discrete element model. Verify the accuracy of particle scaling method. The results show that the axial velocity and circumferential velocity of the particles increase when the helical speed is 500550600650 r/min, and the maximum axial velocity is located at the middle and upper part of the blade, which is at the edge of the blade. The axial velocity of the particles over the radius of the helical blade decreases obviously. At the same filling rate, the mass flow rate and particle axial velocity at the outlet of the device are in good agreement with the experimental data, which satisfies the similarity theory.
【作者单位】：浙江工业大学能源与动力工程研究所;
【基金】：浙江省公益性技术应用研究计划项目(编号:2014C31023)
【分类号】：TH224

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