Influence of cloth structure on operational characteristics of pulse-jet cleaned filter bags

Hindy, K.T.; Sievert, J.; Löffler, Friedrich

doi:10.1016/0160-4120(87)90087-0

Cited by 23 publications

(11 citation statements)

References 3 publications

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“…Effects of the design and operating conditions on the pressure drop have been investigated for various dusts such as limestone powder [7,15,19], fly ash [2,3,7,16,[20][21][22], granite powder [7], alumina powder [6,23], and milk powder [4]. Hot-gas filtration was recently reported for bicarbonate power [13].…”

Section: Introductionmentioning

confidence: 99%

“…The operation involves injecting high-pressure backpulse air into the filter bags for a very short time [6]. A short burst of compressed air is discharged from a nozzle at a uniform time interval [7][8][9], or when the pressure drop across a fabric bag is greater than a set value [10][11][12][13][14][15]. The pulsing of compressed air is usually directed through a venturi into the filter bag to increase the pulse pressure within the bag [16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of pulsing-air injection distance on pressure drop in a coke dust bagfilter

Suh

Lim

Zhu

2010

Korean J. Chem. Eng.

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The effect of the pulsing-air injection distance between the nozzle and venturi on total pressure drop was investigated in a pilot-scale pulse-jet bagfilter for coke dust of a steel mill factory. Theoretical and empirical models were used to predict the pressure drop. The empirical model contains two parameters--dust cake resistance and exponent of areal mass density--to be estimated by experiment. The optimum injection distance for minimizing the total pressure drop was evaluated by 64 experimental data at a fixed filtration velocity and pulse pressure in the practical ranges of dust concentration and pulse interval time. The dust cake resistance shows a minimum value at the optimum injection distance. The empirical model is in good agreement with the experimental data, showing a correlation coefficient of 0.952.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of pulsing-air injection distance on pressure drop in a coke dust bagfilter

Suh

Lim

Zhu

2010

Korean J. Chem. Eng.

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“…Surface and cloth properties influence velocity distribution and hence cake formation and detachment [9,10] . Operation at higher velocity results in compact filter cake formation [10] .…”

Section: Introductionmentioning

confidence: 99%

Experimental study of cake formation on heat treated and membrane coated needle felts in a pilot scale pulse jet bag filter using optical in-situ cake height measurement

et al. 2011

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Pulse-jet bag filters are frequently employed for particle removal from off gases. Separated solids form a layer on the permeable filter media called filter cake. The cake is responsible for increasing pressure drop. Therefore, the cake has to be detached at a predefined upper pressure drop limit or at predefined time intervals. Thus the process is intrinsically semi-continuous. The cake formation and cake detachment are interdependent and may influence the performance of the filter. Therefore, understanding formation and detachment of filter cake is important. In this regard, the filter media is the key component in the system. Needle felts are the most commonly used media in bag filters. Cake formation studies with heat treated and membrane coated needle felts in pilot scale pulse jet bag filter were carried out. The data is processed according to the procedures that were published already [Powder Technology, Volume 173, Issue 2, 19 April 2007, Pages 93–106]. Pressure drop evolution, cake height distribution evolution, cake patches area distribution and their characterization using fractal analysis on different needle felts are presented here. It is observed that concavity of pressure drop curve for membrane coated needle felt is principally caused by presence of inhomogeneous cake area load whereas it is inherent for heat treated media. Presence of residual cake enhances the concavity of pressure drop at the start of filtration cycle. Patchy cleaning is observed only when jet pulse pressure is too low and unable to provide the necessary force to detach the cake. The border line is very sharp. Based on experiments with limestone dust and three types of needle felts, for the jet pulse pressure above 4 bar and filtration velocity below 50 mm/s, cake is detached completely except a thin residual layer (100–200 μm). Uniformity and smoothness of residual cake depends on the surface characteristics of the filter media. Cake height distribution of residual cake and newly formed cake during filtration prevails. The patch size analysis and fractal analysis reveal that residual cake grow in size (latterly) following regeneration initially on the base with edges smearing out, however, the cake heights are not leveled off. Fractal dimension of cake patches boundary falls in the range of 1–1.4 and depends on vertical position as well as time of filtration. Cake height measurements with Polyimide (PI) needle felts were hampered on account of its photosensitive nature.

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“…Koehler와 Leith, 1983;Hsin-Chung과 Tsai, 1996;Liu와 Liptak, 1997;Tsai 등, 2000;Peukert와 Wadenpohl, 2001;Simon 등, 2007 , 1987;Hsin-Chung과 Tsai, 1996), fly ash (Ellenbecker 와 Leith, 1980;Koehler과 Leith, 1983;Dean과 Cushing, 1988;Tsai 등, 2000;Park 등, 2003), 알루미 늄분진 (Simon 등, 2007) 그리고 밀크파우더분진 (Gabites 등, 2008) …”

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Pressure Drop Predictions Using Multiple Regression Model in Pulse Jet Type Bag Filter Without Venturi

Suh¹,

Park

Cho³

et al. 2014

Journal of Environmental Science International

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In this study, pressure drop was measured in the pulse jet bag filter without venturi on which 16 numbers of filter bags (Ø140 × 850 ℓ) are installed according to operation condition(filtration velocity, inlet dust concentration, pulse pressure, and pulse interval) using coke dust from steel mill. The obtained 180 pressure drop test data were used to predict pressure drop with multiple regression model so that pressure drop data can be used for effective operation condition and as basic data for economical design.The prediction results showed that when filtration velocity was increased by 1%, pressure drop was increased by 2.2% which indicated that filtration velocity among operation condition was attributed on the pressure drop the most. Pressure was dropped by 1.53% when pulse pressure was increased by 1% which also confirmed that pulse pressure was the major factor affecting on the pressure drop next to filtration velocity. Meanwhile, pressure drops were found increased by 0.3% and 0.37%, respectively when inlet dust concentration and pulse interval were increased by 1% implying that the effects of inlet dust concentration and pulse interval were less as compared with those changes of filtration velocity and pulse pressure. Therefore, the larger effect on the pressure drop the pulse jet bag filter was found in the order of filtration velocity(Vf), pulse pressure(Pp), inlet dust concentration(Ci), pulse interval(Pi).

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Influence of cloth structure on operational characteristics of pulse-jet cleaned filter bags

Cited by 23 publications

References 3 publications

Influence of pulsing-air injection distance on pressure drop in a coke dust bagfilter

Influence of pulsing-air injection distance on pressure drop in a coke dust bagfilter

Experimental study of cake formation on heat treated and membrane coated needle felts in a pilot scale pulse jet bag filter using optical in-situ cake height measurement

Pressure Drop Predictions Using Multiple Regression Model in Pulse Jet Type Bag Filter Without Venturi

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