刚性陶瓷过滤元件的过滤机理研究

根据空气动力学捕集理论,研究了陶瓷过滤器的过滤机理,计算了刚性陶瓷过滤器的过滤流动,分析了影响过滤效率的重要因素,提出了满足过滤效率要求的“最小厚度”概念,为陶瓷过滤器的设计提供了理论依据。结果表明,在刚性陶瓷过滤元件的过滤中,当靶的尺寸较小（如20μm）时,对于10μm以下的颗粒,拦截和惯性碰撞对过滤所起的作用相当;对于大于10μm的颗粒,拦截比惯性碰撞所起的作用要大得多。当靶的尺寸较大（如80μm）时, 对于很小的颗粒（5μm以下）,拦截和惯性碰撞过对过滤所起的作用相当,而对于稍大的颗粒,拦截 始终起主要作用。在给定的流动速度下,随着颗粒尺寸的增加和靶尺寸的减小,实际分级最小厚度减小。

Research on the Filtration Mechanism of Rigid Ceramic Filter Element

According to the collection theory of aerodynamics, the mechanism of the filter flow in rigid ceramic filter median is discussed, and the filter flow in rigid ceramic filter element is calcu-lated. The effects of the main factors on filter efficiency are analyzed. The concept of "minimum thickness" to meet the requirement of filter efficiency is put forward, and the theoretical base for designing ceramic filter element is established. For the filtration of rigid ceramic filter element, if the size of "target" is small (for example, 20 microns), the effect of interception and inertial col-lision on filtration is about the same when the size of particle is less than 10 microns, the effect of interception is much bigger than that of inertial collision when the size of particle is more than 10 microns. For big target (for example, 80 microns), the effect of interception and inertial collision on filtration is about the same only when the size of particle is much smaller (less than 5 mi-crons). Interception is always the main effects when the size of particle is much bigger. When the flow velocity is constant, the actual classified minimum thickness decreases gradually along with the increase in the size of particle or the decrease in the size of target.