Collection Efficiency as a Function of Particle Size, Shape and Density: Theory and Experience

Dennis, Richard

doi:10.1080/00022470.1974.10470029

Cited by 17 publications

(7 citation statements)

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“…Similar trends in penetration with deposit thickness have also been reported for a pulse-jet filter collecting fly ash on a polyester felt bag, 9 and for shake-cleaned filters collecting fly ash on woven bags. 8 ' 10 Experiments with industrial filters using woven fabrics indicate that penetration passes through a maximum as particle diameter increases from 0.1 to 10 /an.…”

Section: Results Of Penetration Measurementssupporting

confidence: 62%

“…- 12 Although fewer results have been reported for needled felt filters, one study 9 found very similar particle size distributions up and downstream of a pulse-jet cleaned unit, suggesting equal penetration over the 0.5 to 40 |iim range studied. Figure 4 shows that penetration increased with increasing particle diameter for the pulse-jet filter tested, but the penetration increase was slight.…”

mentioning

confidence: 98%

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Performance of a Pulse-Jet Filter at High Filtration Velocity I. Particle Collection

Leith

First

1977

Journal of the Air Pollution Control Association

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Section: Results Of Penetration Measurementssupporting

confidence: 62%

mentioning

confidence: 98%

Performance of a Pulse-Jet Filter at High Filtration Velocity I. Particle Collection

Leith

First

1977

Journal of the Air Pollution Control Association

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“…ft −1 min −1 at 7 ft min −1 ). Similarly, Dennis (15) observed greater than 85% collection efficiency with a normalized pressure drop of 9800 Pa m s −1 (0.2 in. w.g.…”

Section: Discussionmentioning

confidence: 81%

Evaluation of a Shaker Dust Collector for Use in a Recirculating Ventilation System

Peters

Park

Anthony

2015

Journal of Occupational and Environmental Hygiene

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General ventilation with recirculated air may be cost-effective to control the concentration of low-toxicity, contaminants in workplaces with diffuse, dusty operations, such as in agriculture. Such systems are, however, rarely adopted with little evidence showing improved air quality and ability to operate under harsh conditions. The goal of this work was to examine the initial and long-term performance of a fabric-filter shaker dust collector (SDC) in laboratory tests and as deployed within a recirculating ventilation system in an agricultural building. In laboratory tests, collection efficiency and pressure drop were tracked over several filter loading cycles, and the recovery of filter capacity (pressure drop) from filter shaking was examined. Collection efficiencies of particles larger than 5 μm was high (>95%) even when the filter was pristine, showing effective collection of large particles that dominate inhalable concentrations typical of agricultural dusts. For respirable-sized particles, collection efficiencies were low when the filter was pristine (e.g., 27% for 1 μm) but much higher when a dust cake developed on the filter (>99% for all size particles), even after shaking (e.g., 90% for 1 μm). The first shake of a filter was observed to recovery a substantial fraction of filter capacity, with subsequent shakes providing little benefit. In field tests, the SDC performed effectively over a period of three months in winter when incorporated in a recirculating ventilation system of a swine farrowing room. Trends in collection efficiency and pressure drop with loading were similar to those observed in the laboratory with overall collection efficiencies high (>80%) when pressure drop exceeded 230 Pa, or 23% of the maximum loading recommended by the manufacturer. This work shows that the SDC can function effectively over the harsh winter in swine rearing operations. Together with findings of improved air quality in the farrowing room reported in a companion manuscript, this article provides evidence that an SDC represents a cost-effective solution to improve air quality in agricultural settings.

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“…9 also indicates that decreases in filtration velocity should decrease outlet mass flux, in agreement with several experimental studies 8 ' 18 " 20 using pilot scale and full scale pulse-jet filters. Dennis, 9 Hall, 11 and Loffler 13 have shown that outlet dust concentration from a pulse-jet cleaned filter increases substantially but momentarily, immediately after cleaning. Modifications to the cleaning pulse which ease the cleaned bag back to its supporting cage gently so that it hits with less impact have been shown to decrease penetration compared to that found with normal pulse-jet cleaning.…”

Section: Expected Trends In Outlet Fluxmentioning

confidence: 99%

“…8 shows that decreases in inlet dust concentration, ci, should cause a decrease in outlet flux. However, Dennis 9 has determined from field and laboratory studies 7 ' 15 that the mass emission rate or flux from a fabric filter is essentially constant despite changes in inlet concentration. Straight through theory jaredicts that factors which decrease overall penetration, P st , such as increasing diameter for particles larger than a few tenths micrometer, or increasing dust deposit areal density should also decrease outlet flux.…”

Section: Expected Trends In Outlet Fluxmentioning

confidence: 99%

Theory for Penetration in A Pulse-Jet Cleaned Fabric Filter

Leith

Ellenbecker

1980

Journal of the Air Pollution Control Association

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Collection Efficiency as a Function of Particle Size, Shape and Density: Theory and Experience

Cited by 17 publications

References 0 publications

Performance of a Pulse-Jet Filter at High Filtration Velocity I. Particle Collection

Performance of a Pulse-Jet Filter at High Filtration Velocity I. Particle Collection

Evaluation of a Shaker Dust Collector for Use in a Recirculating Ventilation System

Theory for Penetration in A Pulse-Jet Cleaned Fabric Filter

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