Abstract
ABSTRACTPleat structure and tight pleat spacing of pleated filter cartridges often lead to patchy cleaning when applying reverse pulsing technique process to regenerate filter media, consequently resulted in the decrease of the efficiency and quality of reverse pulsed-jet cleaning as well as the service lifetime of filtration units. For improving the non-uniform cleaning or patchy cleaning, a novel convergent trapezoidal pleat shape was used in multi-pulsing reverse flow cleaning. A transient 3D CFD simulation in a simple filtration system with a single filter cartridge was carried out under the four multi-pulsing modes. The effects of multi-pulsing flow cleaning on the cleaning efficiency and quality were systematically investigated. Compared with single-pulsing cleaning mode, the peak pressure differences at the upper regions all became positive because of the increased cleaning frequency, and thus which would be crucially important for improving the local cleaning mechanical stresses and cleaning efficiency. Moreover, the extra peak-pressure augment in the lower regions of filter cartridge also had a positive influence of local cleaning efficiency. For the multi-pulsing scheme of Waveform #4, the peak pressure difference at the section 4 increased by 11.2% than the single-pulsing scheme. The related action mechanism had high correlation with the interaction of residue gas and following jet. Finally, the improvement of the cleaning efficiency and quality are expected to be validated under the decreasing tank pressure and real permeability.
Highlights
Reverse pulsing jet cleaning has been widely adopted in industrial filtration applications for periodical regeneration of cartridge filter media (Leith and Ellenbecker, 1980; Lu and Tsai, 1996; Itoa et al, 1998; Simon et al, 2007)
Pleat structure and tight pleat spacing of pleated filter cartridges often lead to patchy cleaning when applying reverse pulsing technique process to regenerate filter media, resulted in the decrease of the efficiency and quality of reverse pulsed-jet cleaning as well as the service lifetime of filtration units
It has been observed that the top section of filter cartridges have the worst cleaning efficiency and quality under the reverse single pulsing jet flow cleaning in the literatures (Lo et al, 2010b; Yan et al, 2013)
Summary
Reverse pulsing jet cleaning has been widely adopted in industrial filtration applications for periodical regeneration of cartridge filter media (Leith and Ellenbecker, 1980; Lu and Tsai, 1996; Itoa et al, 1998; Simon et al, 2007). For cartridges with classical V-shaped pleats the media pleating parameters (i.e., pleat pitch, height and count as well as filter properties) and the operational variables of reverse pulsing jet (i.e., the air tank pressure, and pulse timing and duration) have their individual effects on the cleaning performance of a pleated cartridge. The performance of pleated filter cartridges (with different pleat geometries and filter medium properties) under various cleaning conditions (i.e., cleaning mode and tank intensity) was investigated in a full-sized dust collector periodically cleaned by a reverse pulsing jet (Lo et al, 2010a). It was found that the pleat ratio (the ratio of pleat height to pleat pitch) had great
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