Fine Particle Filtration Technology Using Fiber as Dust Collection Medium

Kanaoka, Chikao

doi:10.14356/kona.2019006

Cited by 33 publications

(16 citation statements)

References 243 publications

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“…A predominant filter medium used in the inlet air filters in modern combustion engines are filter papers (porous material), characterized by separation efficiency d z ≥ 5 µm, filtration performance of φ w = 99.9%, low thickness g m = 0.4–0.8 mm, and small ( k m = 200–250 g/m 2 ) dust mass loading limited by a permissible pressure drop Δ p fdop of the air filter [ 32 , 33 ]. Filter paper retains dust particles at the fibers of a porous filter media as a result of different forces and separation mechanisms [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Filtration Materials Used in the Car Air Intake

Dziubak

2020

Materials

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Traditional cellulose filter media used for air filtration in vehicle engines are characterized by 99.9% filtration efficiency and accuracy above 2–5 µm. The highest engine component wear is caused by dust grains above 1 µm. Filter media with nanofiber additions provide greater filtration efficiency of dust grains below 5 µm. Filter material selection for vehicle engine air filter is a problem because their manufacturers mainly provide only the structure parameters: pore size, air permeability, and thickness. There is no information about material filtration properties using polydisperse test dust. The manuscript presents methodology and experimental test results of five samples A, B, C, D and E, filter materials differing in their chemical composition and structure parameters. In the first stage, efficiency characteristics φw, filtration accuracy dzmax and the flow resistance Δpw depending on the dust absorption coefficient km of three filter cartridges of each material, A, B, C, D and E, were determined. Then, from each material characteristics of one piece was selected in order to compare their initial and initial period efficiencies as well as changes in the flow resistance depending on the dust absorption coefficient km. Obtained results showed that the filter materials differ significantly in efficiency and accuracy values in the initial filtration period. Initial period duration is also different, i.e., filtration efficiency increasing time to a certain value, which for materials with a nanofiber layer is much shorter, which minimizes engine component wear. For materials with nanofibers, flow resistance increase intensity is greater, which results from surface filtration. Filtration efficiency of each filter material sample A, B, C, D and E was assessed with the filtration quality coefficient including the efficiency and flow resistance. In the available literature, the problem of increasing filtration efficiency in the initial period is known, but there are no results for specific filter materials. Research shows that filter material characteristics are closely related. Each increase in efficiency and accuracy of intake air filtration reduces engine components wear, but it is related to flow resistance increase in the engine intake system, which reduces its power, and increases need for more frequent filter servicing.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Filtration Materials Used in the Car Air Intake

Dziubak

2020

Materials

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“…Therefore, air filters are mostly employed to further purify low‐particle‐concentration gases for applications like clean rooms or building air conditioning. Due to the difference in their uses, bag filters and air filters tend to be considered as completely different particle collecting devices, but they are both fiber‐filled layer filters using said fibers as a collecting body 2.…”

Section: Introductionmentioning

confidence: 99%

Distributions of Fiber Mass, Air Permeability, and Filter Efficiency in Nonwoven Fabric Bag Filters

Fukasawa

Kanaoka

Kimura³

et al. 2021

Chem Eng & Technol

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The accurate determination of physical properties of filtration media is essential for predicting their performance for bag filtration use. The spatial distributions of fiber mass, air permeability, and thickness of three commercially available filtration media were evaluated and compared with the manufacturer's indicated values. The fiber mass and air permeability were distributed over a wide range, resulting in a large deviation from the indicated values. The filter efficiencies were measured for ten randomly sampled pieces from each filter, and the filter efficiency of the whole filtration media and particle emission rate were estimated. Even for filters with a fiber mass and air permeability close to the indicated values, their filter performances differed by approximately 15 %.

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“…Similar to this structure, the cylindrical structure is used for a fiber filter to reduce the trade-off between resistance and efficiency. A cylindrical structure has a larger filtration area and higher filtration efficiency at the same resistance [40][41][42], often used in automobile filters and aviation filters [43,44]. Based on the above analysis, we have designed a cylindrical micro-electrostatic filter.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of a Novel Cylindrical Micro-Electrostatic Particulate Air Filter with High Filtration Efficiency and Low Resistance

Liu

Kong

et al. 2021

Buildings

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The purification of indoor pathogenic microorganisms has become a topic of concern. The use of nonwoven media air filters causes high resistance, and the problem of noise limited their application under high air volume. Thus, we propose a micro-electrostatic filter, which has improved performance compared to an electrostatic filter, with a new type of cylindrical structure to tackle indoor pathogenic microbial aerosol pollution. Through simulation, it is found that the filtration performance of a cylindrical structure is better than that of a plate structure under all simulation conditions. For particles larger than 1 μm, the shortest theoretical length of the dust collecting plate required for the cylindrical structure is 34% shorter than that for the plate structure. For 0.1 μm particles, the filtration efficiency of the cylindrical structure is nearly 20~30% (the maximum value is 29.76%) higher than that of the plate structure, while the air velocity is 1.5 m/s~2.5 m/s. The resistance of the cylindrical micro-electrostatic filter is only half of that of the combined plate type micro-electrostatic filter, indicating that the cartridge structure has enormous energy-saving potential. The introduction of the quality factor further proves that the integrated filtration performance of the cartridge micro-electrostatic filter is better. The application of cylindrical micro-electrostatic filters in HVAC systems can help improve indoor air quality and reduce health risks.

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Fine Particle Filtration Technology Using Fiber as Dust Collection Medium

Cited by 33 publications

References 243 publications

Experimental Study of Filtration Materials Used in the Car Air Intake

Experimental Study of Filtration Materials Used in the Car Air Intake

Distributions of Fiber Mass, Air Permeability, and Filter Efficiency in Nonwoven Fabric Bag Filters

Simulation Study of a Novel Cylindrical Micro-Electrostatic Particulate Air Filter with High Filtration Efficiency and Low Resistance

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