The great interest in the use of fabric filters made of noncircular cross-section fibers for collecting small coal fly ash particles (Geldart's type-C particles) can be seen in this study, in which a nonwoven fabric filter made of circular cross-section polyester fibers was compared with another nonwoven fabric filter made of predominantly trilobal cross-section polyimide fibers.The experimental results show that the collection efficiency of the coal fly ash particles of the polyimide fiber filters is higher than that of polyester fiber filters, mainly for particles smaller than 1.2 mm and with a superficial aerosol velocity of 0.1 m/s. Moreover, the pressure drop across the fabric filters made of polyimide fibers is lower than that of the polyester fiber filters.The influence of the thickness of the polyimide fibers on collection efficiency and pressure drop was also checked, and the results showed that the thinnest fiber fabric filter had the highest collection efficiency, as well as the highest pressure drop.
The present study deals with the influence of diverse operating variables such as gas velocity,
height of the bed, magnetic field strength, and particle bounce on separation of fine dust particles
(iron oxide) in magnetically stabilized granular filters (MSF). The collection results are more
effective when the height of the MSF and dust sizes increase. Investigations concerning the
magnetic field behavior have shown that the collection efficiency increases when the magnetic
field also increases. And the increase of the magnetic field strength has shown that particle
bounce significantly decreases and the adhesion probability, γ, of the MSF improves.
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