The Filter Quality of Dust Cartridge
Date Issued
2008
Date
2008
Author(s)
Chen, Chun-Wan
Abstract
The filter quality of dust cartridge depends both on the collection efficiency of the filter material and the pressure drop across the filter, and is affected by the face velocity, fiber diameter, packing density, filter thickness, charge density, and homogeneous of the filter. The study used theoretical model to examine the filtration factors effect the penetration and filter quality. The study also used the experiment to measure the collection efficiency and the pressure drop of pleated dust cartridge.he study used theoretical model to measure the penetration and filter quality on each aerosol sizes depend on one filtration factors. The results showed the filter quality effects more significant with face velocity than the other mechanisms, the filter quality increase with face velocity decrease and charge density increase. The penetration increases with face velocity, fiber diameter increase, and packing density, thickness, charge density decrease. The most penetrating size increases with face velocity, fiber diameter increase, and packing density, thickness, charge density decrease. But for filter with no charge, the most penetrating size increases with face velocity decrease and doesn’t effect by thickness. he study of pleat filter fabricated six sizes of filter holders to hold just one pleat of filter, simulating six different pleat counts, ranging from 0.5 to 3.33 pleats per centimeter. The possible electrostatic charges on the filter were removed by dipped in isopropyl alcohol (IPA), and the air velocity is fixed at 100 centimeter per second. Liquid dicotylphthalate (DOP) particles generated by a constant output atomizer were used as challenge aerosols to minimize particle loading effects. A scanning mobility particle sizer (SMPS) was used to measure the challenge aerosol number concentrations and size distributions upstream and downstream of the pleated filter. The pressure drop across the filter was monitored by using a calibrated pressure transducer. he results showed that the performance of pleated filters depend on not only the size of particle but also the pleat count of the pleated filter. Based on filter quality factor, the Optimal pleat count (OPC) is always higher than that based on pressure drop by about 0.5 pleats per centimeter. From the aspect of filter quality factor, this study suggests that the respirator manufacturers should add about 0.5 pleats per centimeter to the OPC derived from the generalized correlation curve for pleated filter design based on minimum pressure drop.
Subjects
Dust cartridge
Respirator
Pleated filter
Filter quality
Penetration
Flow resistance
Optimal pleat count
Type
thesis
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