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 23, Issue 5
Displaying 1-5 of 5 articles from this issue
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  • Development of a Continuous Tumbling Fluidized Bed Coater and Its Characteristics
    Eiichi ABE, Hideharu HIROSUE
    1986 Volume 23 Issue 5 Pages 319-325
    Published: May 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.319
    JOURNAL FREE ACCESS
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    A continuous tumbling fluidized bed coater was newly developed. The apparatus has an inlet pipe and several overflow pipes on the side wall of the coating chamber, unlike that of a batch system. The basic characteristics of the apparatus, such as the residence time distribution of seed particles and the relationship between mean residence time and operating factors were investigated. It was found that seed particles were mixed perfectly in spite of their maldistribution in the coating chamber. Also the mean residence time varied inversely with the feed rate of the particles and the flow rate of the inlet air, and it increased with the height of the overflow pipe. However, the phenomena was complicated for the disk rotation speed. The mean residence time decreased with the disk rotation speed below a certain value but increased with it above that value. Continuous coating experiments were also tried and were succesful. The relationship between the coating efficiency and the operating conditions in continuous operation seemed to be essentially the same as that in batch operation.
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  • Spontaneous Ignition of Dust Deposits
    Ignition Temperature and Induction Time
    Hua LIANG, Tatsuo TANAKA, Yoji NAKAJIMA
    1986 Volume 23 Issue 5 Pages 326-331
    Published: May 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.326
    JOURNAL FREE ACCESS
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    The temperature distribution in the combustible dust deposits placed in hot environments is described by a differential equation, according to the thermal theory. The temperature profiles of the dust deposits at any time could be calculated at various ambient temperatures by solving the equation using the finite element method. Thus, the minimum ambient temperature for ignition, which is defined as the ignition temperature, and the induction time to ignition could be determined. With a cylindrical cork dust deposit (volume=3.2×10-3m3, radius=0.08m), the resulting temperature distribution in the radial direction at any time agrees well with the experimental data currently reported by Leuschke, except for extremely high ambient temperatures. Therefore, it is practicable to estimate the spontaneous ignition behavior of dust deposits by computer simulation.
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  • Development. of the New Microfeeder
    Takamasa TAKAHASHI, Hideo SENO
    1986 Volume 23 Issue 5 Pages 332-337
    Published: May 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.332
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  • [title in Japanese]
    Masakata SHIMIZU
    1986 Volume 23 Issue 5 Pages 338-345
    Published: May 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.338
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  • General Remarks upon Sealing Devices
    Akira NAKADE
    1986 Volume 23 Issue 5 Pages 346-361
    Published: May 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.346
    JOURNAL FREE ACCESS
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