Effect of perforated plate baffles on particle segregation in gas fluidised beds of solid mixtures.

Kawabata, Junichi; Tazaki, Yoneshiro; Chiba, Tadatoshi; Yoshida, Kunio

doi:10.1252/jcej.14.246

Cited by 8 publications

(3 citation statements)

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“…Nienow et al 22 developed the correlation for the mixing index for the binary mixtures of particles. Kawabata et al 23 calculated the mixing index of solid mixtures (coal char, ash and silica sand) used in a fluidized bed gasifier. Naimer et al 24 developed the general expression for mixing index that is widely used for all systems in the form as given below.…”

Section: Literaturementioning

confidence: 99%

Mathematical model for mixing index in gas–solid fluidized bed: an analysis

Sahoo¹,

Rana²

2010

Asia-Pacific J Chem Eng

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An available theoretical model for mixing index in gas-solid fluidized bed has been analyzed for further modification and improvement. Assumption of 50% bed material moving in the upward direction and rest 50% in the downward direction considered for the above model (the counter-flow circulation model) has been analyzed for optimum result. A computer program was run for different bed conditions by varying operating parameters, namely, the mixture composition, fractions of bed materials, minimum fluidization velocity of the jetsam particles and that of the bed materials (i.e. mixture of the jetsam and the flotsam particles). The developed model was solved by finite difference (central differencing). Fraction of the bed material moving in the upward direction was varied from 0 to 100% and the minimum fluidization velocity was varied within the U mf of the flotsam to that of the jetsam particles (i.e. 0.465-1.0335 m/s). Optimum fraction of bed materials with respect to its distribution (as per the earlier proposed model) in the upward and downward streams during the fluidization process was found to be 20 and 80%, respectively. The modified model was validated by conducting experiments on fluidization and studying the mixing characteristics of regular homogeneous materials (sago) in a 15 × 100 cm cylindrical column. Fairly good agreement was observed between the values of mixing index obtained from the proposed modified model and the experimental observations. 

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Section: Literaturementioning

confidence: 99%

Mathematical model for mixing index in gas–solid fluidized bed: an analysis

Sahoo¹,

Rana²

2010

Asia-Pacific J Chem Eng

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“…Recently, several studies have found that horizontal baffles can greatly enhance particle segregation. − Gelperin et al investigated the classification of coal particles with binary size distributions in a conical fluidized bed with perforated plates. At higher gas velocities, they could still get high-content fines in the bed top.…”

Section: Introductionmentioning

confidence: 99%

“…At higher gas velocities, they could still get high-content fines in the bed top. Kawabata et al 19 employed a single horizontal perforated plate to promote segregation between sand and coal char in a fluidized gasifier. They found that the promotion of particle segregation was sensitive to decreasing open area, but less sensitive to decreasing hole diameter.…”

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confidence: 99%

Systematic Investigation of Particle Segregation in Binary Fluidized Beds with and without Multilayer Horizontal Baffles

Zhang

Wang²,

Chen

et al. 2012

Ind. Eng. Chem. Res.

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Particle segregation was systematically studied in a binary fluidized bed of inner diameter 0.286 m with fine FCC and coarse millet particles as flotsam and jetsam, respectively. Segregation efficiencies of both flotsam and jetsam, axial and radial fraction profiles were studied and analyzed systematically. A new developed horizontal baffle was examined to see its effects on particles segregation. Experimental results showed that the baffle-free bed could only get high-purity flotsam particles at very low gas velocities. However, both nearly pure jetsam and flotsam particles were obtainable at much higher gas velocities after four layers of new baffle are installed. A wider operating range suitable for particle segregation and greater axial fraction gradients were found in the baffled bed, further proving the baffle’s effect on promoting particle segregation. This enables the baffled bed to be a promising continuous particle classifier in industry. Further analysis demonstrated that reduced bubble size, improve bubble flow distribution, and suppressed solid mixing are the intrinsic causes.

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Experimental study and numerical simulation of baffled bubbling fluidized beds with Geldart A particles in three dimensions

Yang

Zhu

2015

Chemical Engineering Journal

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Effect of perforated plate baffles on particle segregation in gas fluidised beds of solid mixtures.

Cited by 8 publications

References 0 publications

Mathematical model for mixing index in gas–solid fluidized bed: an analysis

Mathematical model for mixing index in gas–solid fluidized bed: an analysis

Systematic Investigation of Particle Segregation in Binary Fluidized Beds with and without Multilayer Horizontal Baffles

Experimental study and numerical simulation of baffled bubbling fluidized beds with Geldart A particles in three dimensions

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