铅酸蓄电池锯切破拆颗粒物气固分离数值模拟

Simulation of gas-solid separation of particulate matter by sawing and demolition of lead-acid battery

依据气固耦合理论,利用CFD-DEM耦合分析方法对铅酸蓄电池锯切破拆颗粒物分离进行仿真模拟。锯切破拆后塑料-铅颗粒的分离,属于稀相气固两相流问题。CFD-DEM间的耦合采用基于欧拉框架下的耦合接口方法实现;颗粒相采用基于拉格朗日法的颗粒追踪,流体相采用基于欧拉法和有限体积法的N-S方程求解。模拟结果表明:不同风速下分离效率不同,分离适宜风速为10-12 m/s;利用搭建的实验装置对模型进行验证,结果表明CFD-DEM方法所得结果与实验结果基本一致;根据ABS颗粒与铅颗粒的模拟分离结果,对分离装置模型的改进策略进行分析,降低隔板高度、减小料斗间距可提高铅颗粒的分离效果。研究可为铅酸蓄电池破拆产物的高效分离提供参考依据。

Based on the gas-solid coupling theory,the CFD-DEM coupling method is selected to numerically simulate the particle separation produced in the process of lead-acid battery sawing and demolition.The particle separation of sawing and demolition is a problem about diluting phase of gas-solid two-phase flow.The coupling between CFD-DEM is realized by use the coupling interface based on Euler framework.The tracking of particle phase is based on Lagrange method.The solving of fluid phase is based on Euler′s method and N-S equation of finite volume method.The results show that the separation efficiency is different under different wind speeds.The suitable wind speed is 10-12 m/s.The simulation model is verified by experimental device that the simulation result is basically consistent with the experimental results.According to the simulated separation effect of ABS particles and lead particles,the promoted strategy for the separation device model is proposed.The separation effect of lead particles can be improved by reducing the height of baffle,and it can also be improved by reducing the distance between the hoppers.A reference may be provided for the efficient separation of lead-acid battery demolition products through the research.