袋式除尘设备气流分布的数值模拟  

Numerical Simulation of Air Flow Distribution in Bag-type Dust Collecting Equipments

作　　者：郑辉[1] 芮晓明[1] 常连生[1] 

机构地区：[1]华北电力大学动力工程系,北京102206

出　　处：《现代电力》2005年第3期46-49,共4页Modern Electric Power

摘　　要：烟气进入袋式除尘设备时的分布状况是影响除尘效率和滤袋寿命的关键因素之一,在袋式除尘设备的进气烟箱中放置气流分布板是改善气流分布的有效方法。为了对除尘设备的气流分布板设计提供合理的参数,文中应用Fluent数值模拟软件对除尘设备进气烟箱放置气流分布板前后气固多相流的分布情况进行了数值模拟,采用k-ε湍流模型模拟气相流动,采用Lagrange法来计算颗粒场特性。模拟结果表明,放置气流分布板后的气流分布情况明显优于未放置之前,气流分布较为均匀。如果合理布置气流分布板的位置、孔径和开孔率,可以为除尘系统气流分布的设计提供最佳的方案。利用数值模拟可以有效地缩短设计过程,避免气流分布模拟试验台因设备不同而不能重复使用造成的浪费,减少了产品开发成本。The distribution of airflow when it enters into a bag-type dust collecting equipment is one of the key factors for the efficiency of a dust collecting equipment and the lifespan of the bag. Putting airflow-distribution boards at the entrance of the equipment is an effective way to improve the airflow distribution. In order to provide a set of proper parameters for the design of an airflow-distribution board, Fluent numerical simulation software package is used to simulate the gas-solid multiphase flow distributions before and after putting the airflow distribution boards in the air-in box. The k-ε turbulent current model is used to simulate the gas phase flow and Lagrange method is used to calculate the solid phase flow. The results show that the airflow distribution is significantly improved with the airflow-distribution boards. Properly setting up the boards with proper aperture in the air-in box would be helpful for achieving the best design of airflow for dust collecting systems. Using numerical simulation can effectively reduce the design time and cut down the product development costs.

关 键 词：袋式除尘设备 气流分布 数值模拟 气固多相流 

分 类 号：TK284.4[动力工程及工程热物理—动力机械及工程]