基于CFD-DEM模拟物料流在转运点处的流动特性

转运点处产生的大量粉尘严重危害生产人员健康及设备安全,为了减少物料颗粒流在该处的产尘量,对颗粒流在输送带转运点处的运动过程进行了数值模拟。模拟依据流体力学基本控制方程和颗粒运动方程的基础理论,其中湍流模型选用RNG k-ε两方程模型,方法采用CFD-DEM双向耦合。经颗粒运动分析和压力流场分析,结果表明:物料颗粒流在转运点处的运动过程呈现出3个运动阶段:弧形下落、碰撞反射、稳定运输。根据这3个阶段的颗粒流运动规律及流场变化情况,改进了一种符合气固两相流流动规律的弧形防尘罩及溜槽,维持物料稳定流动,降低了下落时的动能和产尘量。

The Characteristics of Particle Flow at the Transfer Point of the Conveyor Belt Based on CFD-DEM Simulation

A large amount of dust generated at the transfer point seriously endangers the health of production personnel and the safety of equipment.In order to reduce the amount of dust produced by the particle flow,the movement process of the particle flow at the transfer point of the conveyor belt is numerically simulated.The simulation is based on the basic governing equations of fluid mechanics and the basic theory of particle motion equations,among which the turbulence model is based on the RNG k-εtwo-equation model and the CFD-DEM bidirectional coupling method.Through particle movement analysis and pressure flow field analysis,the results show that the material particle flow presents three movement stages in the process of transport point:arc-shaped fall,collision reflection and stable transport.According to the law of particle flow movement and the change of flow field in these three stages,an arc dustproof cover and chute in line with the law of gas-solid two-phase flow are improved to maintain the stable flow of materials and reduce the kinetic energy and dust production when falling.