Research on the influence of pleat structure on effective filtration area during dust loading

Teng, Guangping; Shi, Guoqing; Zhu, Jintuo; Qi, Jiamin; Zhao, Caijun

doi:10.1016/j.powtec.2021.09.062

Cited by 15 publications

(10 citation statements)

References 26 publications

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“…This result suggests that the decrease in material resistance, due to an increase in the spread area of the thin PTFE membrane with the increase of its pleat height, dominated the decrease in the overall filtration resistance, regardless of the higher structural resistance as a result of potentially closer pleat peak at the larger pleat height. The closer pleat peak could make it more difficult for the air to pass through the filter, thereby causing higher structural resistance . However, the resistances of the pleat H12 filter were comparable between the different pleat heights (Figure b).…”

Section: Resultsmentioning

confidence: 97%

Effect of Pleat Structure on the Air Purification Performance of a Polytetrafluoroethylene/Poly(ethylene terephthalate) Composite Membrane Filter

Wu,

Lin,

Zhou

et al. 2023

Ind. Eng. Chem. Res.

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Cartridge structure has a significant impact on the filtration performance of membrane filters during air purification. A clear understanding of the structure−function relationship of filter cartridges is important for improving their performance in air purification through a rational structure design of filter cartridges. In this work, the effects of pleat height and pleat pitch on the filtration efficiency and resistance of a poly(tetrafluoroethylene)/poly(ethylene terephthalate) (PTFE/PET) composite membrane filter were studied by a combination of experimental tests and computational fluid dynamics simulation. The fouling mechanism of the PTFE/PET composite membrane filter was investigated. The results showed that the PTFE/PET composite membrane filter cartridge with a 55 mm pleat height and 3 mm pleat pitch had the lowest filtration resistance (112 Pa) and the highest filtration efficiency (99.95%). The PTFE/PET composite membrane filter was able to keep the particulate matter at the outlet side of the filtration system below 10 μg•m −3 during a 90day purification cycle. In addition, the membrane fouling was mainly attributed to the pore blockage caused by the dust particles (soluble/insoluble: 23.67:76.33%) smaller than 1 μm. The findings of this work provide guidance on the structural design and optimization of pleat filters pertaining to air purification systems.

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Section: Resultsmentioning

confidence: 97%

Effect of Pleat Structure on the Air Purification Performance of a Polytetrafluoroethylene/Poly(ethylene terephthalate) Composite Membrane Filter

Wu,

Lin,

Zhou

et al. 2023

Ind. Eng. Chem. Res.

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“…During dust loading, the pleated structure of the filter affects the trajectory of the particles [ 3 , 18 , 19 , 21 , 28 – 30 ] and leads to the uneven deposition of dust particles [ 6 , 11 , 31 ]. Some scholars found that the dust deposition on the pleated filter media is closely related to the Stokes number ( S tk ), which can be expressed as Eq (1) [ 18 , 30 ].…”

Section: Methodsmentioning

confidence: 99%

“…The pleating of the filter media can lead to the change of flow field [ 7 – 10 ], resulting in the uneven deposition of dust particles which in turn affects the evolution of the pressure drop [ 11 – 13 ]. Therefore, the flow field of the pleated filters and the uneven deposition of dust particles are to be investigated.…”

Section: Introductionmentioning

confidence: 99%

A numerical simulation method for pressure drop and normal air velocity of pleated filters during dust loading

et al. 2023

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Pressure drop is an important indicator that affects the filtration performance of the pleated filter, and the deposition of dust particles within the pleats is crucial to the evolution of the pressure drop. In this study, the pressure drop during PM10 loading process was investigated for a series of V-shaped and U-shaped filters with a pleat height of 20 mm and different pleat ratios (the ratio of pleat height to pleat width: α = 0.71–3.57). In the numerical simulations, numerical models suitable for different pleated geometries were obtained through experimental verification on the local air velocity. Then, assuming that the dust cake thickness is proportional to the normal air velocity of the filters, the variation of the pressure drop with the dust deposition is derived by means of successive numerical simulations. This simulation method saved a significant amount of CPU time required for the growth of dust cake. It was found that the relative average deviations between experimental and simulated pressure drops were 3.12% and 1.19% for V-shaped and U-shaped filters, respectively. Furthermore, it was found that under the same pleat ratio and the mass of dust deposition per unit area, both the pressure drop and unevenness of normal air velocity of the U-shaped filter were lower than the V-shaped filter. Therefore, the U-shaped filter is recommended due to its better filtration performance.

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“…Li et al 8 studied the effect of pleat geometry on small-scale pleats experimentally and concluded that the pleat ratio should be below 1.59 to achieve a good filtration effect and the influence of the pleat ratio is more pronounced on the pressure differential as the superficial velocity increases. Teng et al 9 found that the effective filtration area increases with a pleat ratio of 2.22–3.70. A larger pleat ratio could allow the larger dust particles to deposit at the pleat corners more easily.…”

Section: Introductionmentioning

confidence: 99%

The study of pleat geometry on the air filtration performance

Yit

Chew

Yau

2022

Indoor and Built Environment

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Fibrous filter media is typically pleated to increase effective filtration area, but the pleat geometry could influence the filtration performance. The previous work focused on the pleat geometry numerically and mainly limited to the cartridge filters with small pleats while the study on the heating, ventilation and air-conditioning (HVAC) filters is limited. In this study, a full-size pleated fibrous air filter was used to investigate the effect of pleat geometry on the filtration performance experimentally with reference to the air filter test standard, ISO 16890. The pleat geometry was found to have an insignificant effect on the filtration efficiency. The optimum pleat ratios are 13.08–14.57 for minimum initial pressure differential and 9.96–11.75 for optimal specific resistance coefficient of dust cake, [Formula: see text]. The overall optimum pleat ratio range is 13.08–14.57 to obtain an optimal filtration performance at low initial pressure differential and low [Formula: see text] while attaining a high dust holding capacity. The findings of current work were obtained by a comprehensive study on the filtration performance including the clean and dust-loaded states of the HVAC filters, at the actual operating velocity and could be directly applied in the actual filter depth selection based on the AHU’s space limitation.

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Research on the influence of pleat structure on effective filtration area during dust loading

Cited by 15 publications

References 26 publications

Effect of Pleat Structure on the Air Purification Performance of a Polytetrafluoroethylene/Poly(ethylene terephthalate) Composite Membrane Filter

Effect of Pleat Structure on the Air Purification Performance of a Polytetrafluoroethylene/Poly(ethylene terephthalate) Composite Membrane Filter

A numerical simulation method for pressure drop and normal air velocity of pleated filters during dust loading

The study of pleat geometry on the air filtration performance

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