Air flows and pressure drop modelling for different pleated industrial filters

Fabbro, L. Del; Laborde, J.C.; Merlin, P; Ricciardi, Laurent

doi:10.1016/s0015-1882(02)80055-6

Cited by 63 publications

(43 citation statements)

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“…In spite of these various advantages, research into pleated filters has been limited to air filters for cleaning up indoor air in vehicles and external flows into an industrial gas turbine (Wakeman et al, 2005). There have been some experimental and numerical studies about HEPA/ULPA filters that have investigated the filtration and filter resistance properties of pleated filter media with various geometrical configurations (Cho et al, 1994;Del Fabbro et al, 2002;Fotovati et al, 2011;Lee et al, 1991). However, it is quite difficult to apply these findings to a bag house system.…”

Section: Introductionmentioning

confidence: 99%

Influence of pleat geometry on filter cleaning in PTFE/glass composite filter

Park

Lee

et al. 2012

Journal of the Air & Waste Management Association

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A pleated filter bag is often used to treat exhaust gas in many industrial applications, due to its fairly high dust collection efficiency and relatively low pressure drop. This work deals with the optimum pleating geometries of a pleated filter made with a newly developed PTFE/glass composite filter. It was found that pleating geometries, including pleat height and pleat pitch, directly affect the cleaning efficiency. The design index, a, which stands for the ratio of pleat height to pleat pitch, is 1.48 for optimum operation. When the a value was higher than 1.48, the pressure drop across the pleated filter medium increased, resulting in a decreased cleaning interval due to the difficulty of filter cleaning. Therefore, it is necessary that the optimum pleating geometry should be determined by employing the dimensionless parameter, a, in the design of cartridge filters.Implications: A pleated filter bag is often used to treat exhaust gas in many industrial applications due to its fairly high dust collection efficiency and relatively low pressure drop. The present paper introduces an optimum design configuration to make a pleated filter with newly developed PTFE/glass composite filter media. A dimensionless parameter that is the ratio of pleat height to pleat pitch should be considered to make the best quality pleated filter.

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Section: Introductionmentioning

confidence: 99%

Influence of pleat geometry on filter cleaning in PTFE/glass composite filter

Park

Lee

et al. 2012

Journal of the Air & Waste Management Association

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“…The observations that were made for this regime (Del Fabbro et al 2002) leads one to explain it by an imbalance in the cake thickness and then in the accumulated mass. In the present work, the pressure drop is as expected (no surface reduction) but the measured distribution seems to be influenced by the filtration conditions.…”

Section: Mass Distribution Inside the Pleat/surface Filtrationmentioning

confidence: 94%

“…The third filtration step which corresponds to a surface reduction is only observed for pleated filters with an acceleration of the pressure drop increase. This last step has not been phenomenologically studied yet, especially for nanoparticles, but some authors have demonstrated that this filtration step depends on the pleat geometry and on the air flow (Del Fabbro et al 2002;Mocho and Ouf 2011). One hypothesis to explain this phenomenon is to consider that an inhomogeneous deposition occurs in the pleat and causes a reduction of the efficient filtration surface before the full loading of the pleat.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Nanoparticles Distribution in Flat and Pleated Filters During Clogging

Bourrous¹,

Bouilloux²,

Ouf³

et al. 2014

Aerosol Science and Technology

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It is currently admitted that for each filtration process using pleated filters, at least three steps can be distinguished: depth and surface filtration, which are common to flat filters, and surface reduction. This step is caused by inefficient filling of the pleat due to the filter geometry. For combustion aerosol, it has been proved that this third step strongly depends on the filtration velocity resulting in an increase of the resistance when air flow decreases. This observation leads one to think that Brownian diffusion, higher for low velocities, could influence the clogging dynamic of a pleated filter.In this article, a protocol derived from the dust cake preparation method published by Schmidt is developed. The aim of this study is to measure the aerosol penetration inside a filter media as well as in a pleat using a scanning electronic microscope and energy dispersive X-ray spectroscopy elementary detection. This method has also been extended to the study of pleated filters to measure the particle distribution inside the pleat. Filters were loaded with nanoparticles in order to evaluate the specificity of the diffusional regime on the clogging of pleated HEPA filters. For pleated filters, two filtration velocities were investigated: 2.5 and 0.2 cm/s.

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“…An essential element within the compressed air system is given by the filter, which, dependent on the application, results in a pressure drop. Wang et al [13] and Del Fabbro et al [14] introduced a model representing the pressure drop at filters; a simplified approach from pressure drop estimation is given by the Darcy equation [15]. Pressure drops with local compressed air supply are possible due to corresponding distribution, pipes and fittings.…”

Section: Assignment Of Inefficienciesmentioning

confidence: 99%