化工进展2017，Vol.36Issue(9)：3217-3222,6.DOI:10.16085/j.issn.1000-6613.2017-0181
水冷螺旋输送机内颗粒的流动特性
Flow characteristics of particles in water-cooled screw conveyor
摘要
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.关键词
水冷螺旋输送机/离散单元法/颗粒/流动特性/力链Key words
water-cooled screw conveyor/discrete element method(DEM)/particle/flow characteristics/force chain分类
机械制造引用本文复制引用
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(9):3217-3222,6.基金项目
山东省科技发展计划(2013GGX10404)及山东省自然科学基金(ZR2013EEQ005)项目. （2013GGX10404）
