PM2.5 quality factor for ranking different cleanable filter media

W. Hoeflinger*, T. Laminger, Technical University Vienna, Austria

Usually filter media with decreasing air permeability`s, respectively increasing air resistances, show better separation efficiencies or lower penetration. But a filter with perfect separation efficiency and intolerable resistance is of no use. Consequently both, the penetration behavior and the air resistance of a filter medium should be considered, when ranking different filter media. A quality factor, already used for depth filters, can be an indicator of filter media performance, where the ratio of the logarithmic inverse aerosol penetration and the pressure drop is used for ranking different filter media. A. Podgorski et.al (FILTECH2007) showed for depth filters, if the separation of only a certain particle size x is in focus, that the quality factor depends on the particle size. In such a case the optimal filtration performance can change with varying particle size, regarding different filter media.

No such filter media ranking method is known for cleanable filter media. For such filter media, besides the pressure drop Δp, the number of cleaning pulses with their pressurized air consumption provides also a contribution to the filter medium quality and should be considered.

In this paper a quality factor, including this cleaning pulse influence is defined and further used to rank different cleanable filter medium. Furthermore, the quality factor Qf,PM2.5,30 focusses only on the penetration PPM2.5 of the fine particle fraction PM2.5, averaged over 30 cycles....

Session: G9 - Surface Filtration
Day: 14 March 2018
Time: 13:00 - 14:15 h

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