Textiles in air filtration

Maduna, Lebo; Patnaik, Asis

doi:10.1080/00405167.2018.1461921

Cited by 20 publications

(21 citation statements)

References 214 publications

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“…Dust-holding capacity (DHC) is the amount of dust kept on the filter after dust loading at the final pressure drop [ 25 ]. Final pressure drop is mostly considered as twice the initial pressure drop value in high efficiency filter media [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Bulejko

Krištof²,

Dohnal³

2021

Membranes

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In this work, we tried to analyze dust loading behavior of polypropylene hollow fiber membranes using average pressure drop models. Hollow fiber membranes varying in fiber diameter were loaded with a standardized test dust to simulate particle-polluted air. We measured pressure drop development of the membranes at different flowrates and dust concentrations, and, after each experiment, the dust deposited on the membrane fibers was weighed to obtain dust holding capacity (DHC). The obtained experimental data was analyzed using various average pressure drop models and compared with average pressure drop obtained from pressure drop/dust load dependence using a curve fit. Exponential and polynomial fitting was used and compared. Pressure drop in relation to the dust load followed different trends depending on the experimental conditions and inner fiber diameter. At higher flowrate, the dependence was polynomial no matter what the fiber diameter. However, with higher fiber diameter at lower permeate velocities, the dependence was close to exponential curve and followed similar trends as observed in planar filter media. Dust-holding capacity of the membranes depended on the experimental conditions and was up to 21.4 g. However, higher dust holding capacity was impossible to reach no matter the experiment duration due to self-cleaning ability of the tested membranes.

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Section: Resultsmentioning

confidence: 99%

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Bulejko

Krištof²,

Dohnal³

2021

Membranes

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“…Filtration mechanisms. A useful review of the main physical mechanisms that apply generally to small particles in air filtration [540] lists them as: Direct Interception, where the particle follows a flow path to within a particle radius of a filter fibre and is captured Inertial Impaction, where the (larger) particle does not deviate with the flow so collides with the filter fibre, and Diffusion, where the very-fine particles are jostled by collisions with molecules of gas (Brownian motion) and caused to collide with filter fibres and become trapped. Electrostatic Attraction, which occurs when opposites charge exist or charges are generated between the filter fibres and particles.…”

Section: Surgical Gowns Aprons and Gloves And Healthcare Workers' CLmentioning

confidence: 99%

“…Medium particles, in the 0.1 to 0.4 mm diameter range, turn out to be the most penetrating, despite being captured by both the diffusion and interception filtration mechanisms. Small particles, below 0.1 mm in diameter, are captured mostly by the diffusion mechanism, but more effectively than those in the medium size in the range [540,541] For such as the Coronavirus aerosol droplets, which will vary in size, there will be many of a size which will fall within the range 0.1 À 0.4 mm where the filter is operating at low effectiveness, at least insofar as these physical mechanisms are concerned.…”

Section: Surgical Gowns Aprons and Gloves And Healthcare Workers' CLmentioning

confidence: 99%

Medical textiles

Morris

Murray

2020

Textile Progress

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“…Polyacrylonitrile (PAN), polyphenylene sulfide (PPS) and polyimide (PI) fibers are generally used to manufacture filter fabrics (in the form of filter bags) for coal fired power plants, where the filters are exposed to higher temperatures and harsher chemical environment. These fibers have good thermal and chemical resistances, therefore, they are widely used in coal fired power plants [1].…”

Section: Introductionmentioning

confidence: 99%

“…In other words, it determines the pressure drop of a filter fabric. A good filter fabric must have high filtration efficiency whilst maintaining a reasonable higher air permeability [1]. The air permeability can be used to determine lifetime of the filter bags since it is related to the pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Optimization of air permeability of spunlaced filter fabrics using the Box–Behnken experimental design

Maduna

Patnaik

Mvubu³

et al. 2019

Journal of Industrial Textiles

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One of the most important characteristics that a filter must possess is high air permeability. A good filter fabric must be able to capture the dust particles while maintaining a good airflow through it in order to reduce high pressure drop. Therefore, producing a filter fabric with the desired air permeability can be challenging as several process parameters such as fiber types, area weight and water jet pressure will interact with each other during spunlacing process and influence the fabric air permeability. To study the effects of these independent variables on the air permeability of three different types of spunlaced fabrics, the Box–Behnken design was used to model their effects. The fibers used were polyacrylonitrile, polyphenylene sulfide and blend of polyphenylene sulfide/polyimide. In addition, filtration properties of some of the filter samples were also evaluated. Based on the effects of the fiber types, area weight and water jet pressure on the fabric air permeability, the optimum conditions for achieving higher air permeability were fiber types (+1 level), area weight (0 level) and pressure (−1 level), respectively. The air permeability of the fabrics decreased with increasing water jet pressure for all fiber types and increasing area weight decreased the air permeability. It was observed that the independent variables had a significant effect on the air permeability. Filtration efficiency of the selected filters samples were ≥95%. Among the selected samples, polyphenylene sulfide/polyimide (440 g/m2) fabric has the lowest pressure drop whereas polyacrylonitrile (560 g/m2) has the highest pressure drop.

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Textiles in air filtration

Cited by 20 publications

References 214 publications

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Medical textiles

Optimization of air permeability of spunlaced filter fabrics using the Box–Behnken experimental design

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