水冷螺旋输送机内颗粒的流动特性

发布时间：2018-07-08 14:50

本文选题：水冷螺旋输送机 + 离散单元法　；参考：《化工进展》2017年09期

【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。
[Abstract]:The movement of particles in water-cooled screw conveyer plays a decisive role in heat transfer efficiency. In order to reveal the flow characteristics of particles in water-cooled spiral conveyors used in the orchid carbon industry, a calculation model of water-cooled spiral conveyors is established based on discrete element method (Dem). The helical rotation speed and filling coefficient are analyzed from the point of view of particle group force chain. The influence of pitch and diameter of helical shaft on the flow of particles inside. The results show that the velocity of particles near the shell decreases due to the boundary inhibition. When the filling coefficient is less than 80, the movement of particles is mainly slip, and when the filling coefficient is greater than 80, the movement of particles is mainly rotation. When the ratio of pitch to helical diameter is less than 2 / 3, the motion of particles is mainly rotation, and when the ratio of pitch to helical diameter is more than 2 / 3, the axial motion of particles gradually dominates. The mass flow rate increases with the increase of screw speed and pitch, and decreases with the increase of helical shaft diameter. The sensitivity of mass flow rate to filling coefficient above 80% is higher than that of low filling coefficient.
【作者单位】：上海理工大学能源与动力工程学院;山东理工大学交通与车辆工程学院;
【基金】：山东省科技发展计划(2013GGX10404) 山东省自然科学基金(ZR2013EEQ005)项目
【分类号】：TQ051.5

【相似文献】