Journal of the Society of Powder Technology, Japan

Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157

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Volume 36, Issue 12

Displaying 1-14 of 14 articles from this issue

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Research of Particle Behavior for Gas-Solid Swirling Flow in a Vertical Pipeline

Hui LI, Yuji TOMITA, Masateru SHIRAISHI, Katsuya FUNATSU

1999 Volume 36 Issue 12 Pages 874-880
Published: December 10, 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.874

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Measurements of particle velocity and concentration profiles for a swirling gas-solid flow in a vertical pipeline with a height of 12m and an inner diameter of 80mm have been performed by photographic methods. Polyethylene pellets with mean diameter of 3.2mm were used as test particles. The initial swirl numbers were varied from 0.38 to 0.94, the mean air velocities from 9m/s to 25m/s and the solid-gas ratios from 0.2 to 0.7. It was found that in the acceleration region the mean particle velocity for the swirling gas-solid flow was higher than that for the axial gas-solid flow in the lower air velocity range and was lower in the higher air velocity range. Along the axial direction the change of the mean particle velocity for the swirling gas-solid flow was larger than that for the axial gas-solid flow in the acceleration region. With swirling flow, the particle velocity profiles became uniform.

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Accurate Wet-type Centrifugal Classification Using an Almost Rigidly Rotating Flow

Classification Principle and Performance of the Batch-type Classificatton

Koichi NAKABAYASHI, Yoichi TSUCHIDA

1999 Volume 36 Issue 12 Pages 881-890
Published: December 10, 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.881

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We have proposed a new system for an accurate wet-type centrifugal classification to which an almost rigidly rotating through-flow is applied. This flow can be produced within a highly rotating double-walled container, without any turbulent fluctuation. In the present paper, we have employed the batch-type classification with a cylinder-sphere-shaped container in classification experiments, theoretical and numerical flow analyses and flow-visualization measurements. Consequently, we have obtained the following main conclusions; (1) with decreasing Ekman number (i. e. increasing rotation rate) at a constant Rossby number or with decreasing Rossby number (decreasing through-flow rate) at a constant Ekman number, the cut size and fine yield decrease and the classification accuracy increases, (2) for the occurrence of rigid-rotation region which is indispensable to collect the coarse product, it is necessary to make the flow field inverse-C-shaped towards the rotation axis.

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Accurate Wet-type Centrifugal Classification Using an Almost Rigidly Rotating Flow

Classification Principle and Performance of the Continuous-type Classification

Koichi NAKABAYASHI, Yoichi TSUCHIDA

1999 Volume 36 Issue 12 Pages 891-896
Published: December 10, 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.891

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In this paper, we studied the performance of continuous wet-type centrifugal classification system which was developed based on the batch-type system with an almost rigidly rotating flow proposed in our previous paper. The continuous operation was achieved by extracting the coarse product from the equator of housing. We have experimentally investigated the influence of extraction on the classification performance and the critical extraction rate. We obtained the following conclusions; (1) extraction affects neither the stably-rotating flow nor the rotating stratified flow structure, although the rigid-rotation region of the batch-type shifted into an interior region and Ekman layers, (2) when the extraction rate is below the threshold value (critical extraction rate), the cut size and fine yield decrease with increasing extraction rate, but the sharpness index is almost as high as that for the batch-type, (3) the critical extraction rate is reduced with decreasing Ekman and Rossby numbers.

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Process Development of New Semidry Flue Gas Desulfurization by a Powder Particle Fluidized Bed

Kunio KATO

1999 Volume 36 Issue 12 Pages 897-905
Published: December 10, 1999
Released on J-STAGE: July 01, 2010

DOIhttps://doi.org/10.4164/sptj.36.897

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[title in Japanese]

Norio KIMURA

1999 Volume 36 Issue 12 Pages 906-911
Published: December 10, 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.906

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[title in Japanese]

Kaori JONO

1999 Volume 36 Issue 12 Pages 912-914
Published: December 10, 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.912

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[title in Japanese]

Shuji MATSUSAKA

1999 Volume 36 Issue 12 Pages 915-917
Published: December 10, 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.915

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Erratum to : Classification of Flyash Particles with a Modified Louver-type Separator and Reduction of Unburned Carbon Content

1999 Volume 36 Issue 12 Pages 942a
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942a

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Erratum to : Amorphization of Kaolinite and Media Motion in Grinding by a Double Rotating Cylinders Mill

1999 Volume 36 Issue 12 Pages 942b
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942b

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Erratum to : Disruption Characteristics of Bakers' Yeast with High-pressure Homogenizer

1999 Volume 36 Issue 12 Pages 942c
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942c

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Erratum to : Developments of Particle-Fluid Separation

1999 Volume 36 Issue 12 Pages 942d
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942d

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Erratum to : Effect of Polycrystal Diamond Grain Shape on Lapping Characteristics

1999 Volume 36 Issue 12 Pages 942e
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942e

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Erratum to : Evaluation of Mixing Performance of Adhesive Fine Powders in a Tumbling Fluidized Bed Granulator equipped with an Opposed Pulsed Jet Assembly

1999 Volume 36 Issue 12 Pages 942f
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942f

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Erratum to : Key Technology to Create a Recycling Oriented System

1999 Volume 36 Issue 12 Pages 942g
Published: 1999
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.36.12_942g

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