褶式过滤器捕集效率及其性能评估

Collection Efficiency and Performance Evaluation of Pleated Filter

建立随机排列的二维褶式纤维过滤器微观模型,采用数值模拟计算褶式过滤器内气固两相流的流动过程,基于拉格朗日离散相模型,对多角度、多风速、多填充率与多粒径下褶式过滤器的捕集效率分析,结果表明带有褶角的褶式过滤器捕集效率随着褶角增大呈减小趋势,随过滤风速的增大而增大、随填充率的增大而增大,在惯性碰撞机理条件范围内捕集效率随粒子直径的增大而增大。综合考虑褶式纤维的捕集效率和压力损失,对在一定填充率及过滤风速下褶式过滤器的质量因子进行分析,可以得出褶式过滤器存在最佳褶角。

Establish a microscopic model of two-dimensional randomly pleated fiber filter,use numerical simulation to calculate the flow process of gas-solid two-phase flow in the pleated filter,based on the Lagrangian discrete phase model,analyze the collection efficiency of pleated filters with multiple particle diameters,multi-angle,multi-wind speed,multifiber volume fraction,the results show that the collection efficiency of pleated filters with pleat angles decreases with increasing pleat angle,and increases with increasing filtration velocity.It increases with the increase of the fiber volume fraction,and the collection efficiency increases with the increase of the particle diameter within the range of inertial collision mechanism conditions.Considering the collection efficiency and pressure loss of the pleated fiber comprehensively,the quality factor of the pleated filter under a certain fiber volume fraction and wind speed is analyzed,and it can be concluded that the pleated filter has the best pleated angle.