水冷螺旋输送机内颗粒的流动特性

doi:10.16085/j.issn.1000-6613.2017-0181

化工进展 ›› 2017, Vol. 36 ›› Issue (09): 3217-3222.DOI: 10.16085/j.issn.1000-6613.2017-0181

水冷螺旋输送机内颗粒的流动特性

张忠良¹, 刘永启², 郑斌², 李瑞阳¹, 郁鸿凌¹

1 上海理工大学能源与动力工程学院, 上海 200093;
2 山东理工大学交通与车辆工程学院, 山东淄博 255049

收稿日期:2017-02-06 修回日期:2017-03-23 出版日期:2017-09-05 发布日期:2017-09-05
通讯作者: 刘永启,教授,博士生导师,主要从事固体物料余热回收研究。
作者简介:张忠良(1989-),男,博士研究生,主要从事固体物料余热回收研究。E-mail:15264311799@163.com
基金资助:
山东省科技发展计划（2013GGX10404）及山东省自然科学基金（ZR2013EEQ005）项目。

Flow characteristics of particles in water-cooled screw conveyor

ZHANG Zhongliang¹, LIU Yongqi², ZHENG Bin², LI Ruiyang¹, YU Hongling¹

1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, Shandong, China

Received:2017-02-06 Revised:2017-03-23 Online:2017-09-05 Published:2017-09-05

摘要/Abstract

摘要： 水冷螺旋输送机内颗粒的运动对其换热效率起决定性作用。为揭示应用于兰炭行业的水冷螺旋输送机内颗粒的流动特性，本文基于离散单元法（DEM）建立了水冷螺旋输送机的计算模型，从颗粒群力链的角度分析了螺旋转速、填充系数、螺距以及螺旋轴直径对其内部颗粒流动的影响。结果表明：壳体附近颗粒的运动速度因边界抑制作用有所降低。填充系数小于80%时，颗粒的运动以滑移为主；填充系数大于80%时，颗粒的运动以旋转为主。满填充状态下，螺距与螺旋直径之比小于2/3时，颗粒的运动以旋转为主；螺距与螺旋直径之比大于2/3时，颗粒的轴向运动逐渐占据主导地位。质量流率随螺旋转速和螺距的增加而增加，随螺旋轴直径的增加而降低。质量流率对高于80%填充系数的敏感程度高于低填充系数的敏感程度。

关键词: 水冷螺旋输送机, 离散单元法, 颗粒, 流动特性, 力链

Abstract: Particle motion in a water-cooled screw conveyor is crucial to its heat transfer efficiency. In order to reveal the flow characteristics of particles in water-cooled screw conveyor used in semi-coke industry,the calculation model of water-cooled screw conveyor was established based on discrete element method(DEM). The influence of screw speed,filling rate,pitch and screw shaft diameter on the flow characteristics of particles were studied from the perspective of particle force chain. The results showed that the velocities of the particles near the casing are reduced by the boundary inhibition. The motion of the particles is mainly slip when the filling rate is less than 80% and mainly rotation when the filling rate is more than 80%. Under full-fill conditions,the motion of the particles is dominated by rotation when the ratio of the pitch to the helix diameter is less than 2/3. And the axial motion of the particles gradually toke the dominant position when the ratio of the pitch to the helix diameter is more than 2/3. The mass flow rate increased with the increase of screw speed and pitch,and decreased with the increase of screw shaft diameter. The sensitivity of the mass flow rate to the fill rate above 80% is higher than the sensitivity of the low fill rate.

Key words: water-cooled screw conveyor, discrete element method (DEM), particle, flow characteristics, force chain

中图分类号:

TH224

张忠良, 刘永启, 郑斌, 李瑞阳, 郁鸿凌. 水冷螺旋输送机内颗粒的流动特性[J]. 化工进展, 2017, 36(09): 3217-3222.

ZHANG Zhongliang, LIU Yongqi, ZHENG Bin, LI Ruiyang, YU Hongling. Flow characteristics of particles in water-cooled screw conveyor[J]. Chemical Industry and Engineering Progress, 2017, 36(09): 3217-3222.

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水冷螺旋输送机内颗粒的流动特性

Flow characteristics of particles in water-cooled screw conveyor

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