静电增强纤维动态过滤的理论研究

为了推导、预测滤料间有外加静电场时过滤器效率和压降的变化并且分析各参数如纤维厚度、颗粒直径、电场强度对效率和阻力的影响,提出了建立在D．Thorns建立的数学模型的基础上的静电增强纤维动态过滤效率和压降的计算方法,首先计算了单纤维的过滤效率和压降,然后计算纤维过滤器稳定状态的过滤效率和压降,从而计算了纤维过滤器动态过滤时的效率和压降,得出了重要结论：粒子直径越小,压力损失越大；电场强度越大,过滤效率越大,压力损失越小；增加纤维厚度能显著提高过滤器的过滤效率。

Efficiency and Pressure of Non-steady State Filtration by Fibrous Filters in Presence of Electric Field

The model developed by D.Thomas was employed to predict the changes of the filtration efficiency and pressure drop and the parameters such as filter depth; particle size and electric field intensity was studied in order to observe their effects on efficiency and pressure drop. A calculation approach was applied to calculate the efficiency and pressure of non-steady state filtration by fibrous filters in the presence of electric field application, The filtration efficiency and pressure drop of single fiber was calculated, then of the steady-state of the clean fibrous filter. And the filtration efficiency and pressure drop of non-steady state was calculated using above two results. Some important conclusions were achieved that the pressure drop of fibrous filter became lower when the particle size was smaller; the efficiency of fibrous filter became higher, but the pressure drop became lower because of the increase of electric field intensity; the increase of filter depth could remarkably improve the filtration efficiency.