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

WANG Feng-yong ZHOU Jian-hua (Institute of Power Plant & Automation,Shanghai Jiao Tong University,Shanghai 200030,China)  
The model developed by D.Thomas was employed to predict the changes of the filtration efficiency and pressure drop and the param- eters 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 pres- sure 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 be- came higher,but the pressure drop became lower because of the in- crease of electric field intensity;the increase of filter depth could re- markably improve the filtration efficiency.
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