Research on the Filtration Mechanism of Rigid Ceramic Filter Element
Gao Tieyu,Zhang Jianying,Xu Tingxiang
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049, China)

Abstract: 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.
Keywords: ceramic filter element;minimum thickness;filter efficiency;inertial collision;inter-ception