Optical in situ measurement of dust cake thickness distributions on rigid filter media for gas cleaning

Dittler, Achim; Gutmann, Bernd; Lichtenberger, Ralf; Weber, Herbert; Kasper, Gerhard

doi:10.1016/s0032-5910(98)00102-8

Cited by 26 publications

(7 citation statements)

References 7 publications

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“…4a) confirms the duration of this transition period. The concavity is logical because it reflects an analogy with a patchy cleaning (such behavior has been observed by other authors [39,[49][50][51][52][53]). The parallel with a patchy cleaning can be explained as follow: areas, which are still clogged after a patchy cleaning, correspond to the first cleaned bags (because both have the higher airflow resistances); and areas, in which dust cake has been detached in a patchy cleaning, are similar to the last cleaned bags (because both have the smallest airflow resistances).…”

Section: Distribution Of Airflows Amongst Bags During Pulse-jet Cleansupporting

confidence: 53%

Consequences of high transitory airflows generated by segmented pulse-jet cleaning of dust collector filter bags

Simon¹,

Bémer²,

Chazelet³

et al. 2010

Powder Technology

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Section: Distribution Of Airflows Amongst Bags During Pulse-jet Cleansupporting

confidence: 53%

Consequences of high transitory airflows generated by segmented pulse-jet cleaning of dust collector filter bags

Simon¹,

Bémer²,

Chazelet³

et al. 2010

Powder Technology

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“…The situation is an over simplification of the ground reality. It is not necessary that the whole regenerated filter surface will become free of dust [1,2] . A two dimensional flow model was applied to describe the pressure drop evolution on patchily regenerated filter surface.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the forming cake will possess different properties locally which may affect cake detachment. Patchy cleaning has been reported on both flexible and rigid filter media [1,2] . Since the performance of the bag house is strongly linked to the cake formation and regeneration, information on cake height distribution, size of cake patches and growth of cake patches is very important for understanding the cake formation phenomena, modeling the pressure drop evolution, and predicting the behavior of the filter.…”

Section: Introductionmentioning

confidence: 99%

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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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“…This phenomenon is referred to as patchy cleaning. Dittler et al [1] presented experiments with rigid ceramic filters where cake thickness distributions over the filter area were measured optically. Patchy cleaning causes a severely uneven distribution of the filtrate over the filter area.…”

Section: Introductionmentioning

confidence: 99%

Model Development of the Transient Solid Hold-up and Pressure Drop in Fabric Filters

Kavouras

Krammer²

2002

Chem. Eng. Technol.

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Optical in situ measurement of dust cake thickness distributions on rigid filter media for gas cleaning

Cited by 26 publications

References 7 publications

Consequences of high transitory airflows generated by segmented pulse-jet cleaning of dust collector filter bags

Consequences of high transitory airflows generated by segmented pulse-jet cleaning of dust collector filter bags

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

Model Development of the Transient Solid Hold-up and Pressure Drop in Fabric Filters

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