Predicting Pressure Loss for Pulse Jet Filters

Dennis, Richard; Wilder, John E.; Harmon, D.L.

doi:10.1080/00022470.1981.10465316

Cited by 36 publications

(8 citation statements)

References 6 publications

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“…Many different bag-cleaning parameters such as peak pressure, pressure rise rate, fabric acceleration, and pressure impulse in the fabric bag have been claimed to be responsible for dust cake release by previous investigators [5][6][7][8][9]. In this study, peak pressure on the surface of filter bag, pressure rise rate and maximum reverse acceleration are used as evaluation indicators of bag-cleaning intensity.…”

Section: Evaluation Indicatorsmentioning

confidence: 97%

Discussion on influencing factors of the pulse-jet performance of fabric filter

Dang

Min

et al. 2011

2011 International Conference on Electric Technology and Civil Engineering (ICETCE)

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In this study, we establish a numerical model and use computational fluid dynamics (CFD) analysis to measure peak pressure on the surface of filter bag. The numerical results are in good agreement with the experimental data during the pulse cleaning process. Peak pressure on the surface of filter bag, pressure rise rate and maximum reverse acceleration are used as evaluation indicators of bag-cleaning intensity. The filter bag peak pressure, pressure rise rate and maximum reverse acceleration along the length direction of filter bag during the pulse cleaning process are analyzed under different pulse-jet pressure, different pulse-jet distance, different length of filter bag, different pulse-jet time and for different diameter of nozzle. The results show that three evaluation indicators are consistent along with the change tendency of various factors. The evaluation indicators all have remarkable drop along with the filter bag length increasing, and increase as the nozzle diameter and the injection pressure increase. It provides optimal ranges of pulsejet distance and pulse-jet time, such as pulse-jet distance is at 250 mm, and pulse-jet time is in 70~100 ms. The design length of filter bag unfavorably exceeds 8000 mm. The simulation method can direct-viewing describe pulse-jet flow, and reflect accurately the characteristics of cleaning, thus enhance design reliability.

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Section: Evaluation Indicatorsmentioning

confidence: 97%

Discussion on influencing factors of the pulse-jet performance of fabric filter

Dang

Min

et al. 2011

2011 International Conference on Electric Technology and Civil Engineering (ICETCE)

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“…The residual resistance is strongly dependent on time. Previous researchers [2,3] have generally assumed that after a short conditioning period, the resistance of the filter reaches an equilibrium and the residual resistance can then be regarded as a constant. For wool carbonizing processes, however, it appears that the residual resistance of the filter is time dependent for a major portion of the cloth's lifetime (-1 year).…”

Section: _ Predicting Performance Of Filtersmentioning

confidence: 99%

Performance of a High Velocity Pulse Jet Filter in a Wool Carbonizing Process

Humphries

Miceli

Madden

1984

Textile Research Journal

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Experiments on a high velocity pulse jet filter used to control emissions from a wool carbonizing process have shown that it is necessary to use filter cloths with a surface skin to prevent premature blinding of the fabric. The skin partially prevents dust and wool fiber from penetrating into the depth of the fabric and, subsequently, the dust is more easily dislodged during cleaning. Although both Goretex® and a calendered needlefelt have given satisfactory performance at a filtration velocity of 65 mm/s, there is a gradual increase in the resistance to airflow through the fabrics with time. This is due to the accumulation of dust on the fabric, which is not removed by the normal cleaning pulse. After eight months service, 56% of the resistance of the Goretex cloth was due to dust that was not dislodged from the fabric during cleaning, 38% to dust which was dislodged during cleaning but immediately redeposited on the bag, and 6% to dust added during the filtration cycle and cleaned from the fabric by the cleaning pulse. The efficiency of the cleaning process can be improved by cleaning the filter off-line rather than the more normal on-line cleaning. Under these conditions the dust that is usually redeposited on the bag is allowed to reach the hopper.

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“…Bags are usually arranged in rows and are cleaned in succession, row-by-row (segmented cleaning method). In most cases, studies on pulse-jet cleaning have attempted to improve understanding of the mechanisms leading to dust cake detachment [4][5][6][7][8][9][10]. On the other hand, few data are available concerning the downstream particle emission [4,[11][12][13][14][15][16], particle re-deposition resulting from a pulse-jet cleaning [17][18][19][20][21] and heterogeneity of airflow resistances that can be created between bags during cyclic operations [18,22].…”

Section: Introductionmentioning

confidence: 99%