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Volume 24, Issue 1
Displaying 1-6 of 6 articles from this issue
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Effects of Scale IncreaseHua LIANG, Tatsuo TANAKA1987 Volume 24 Issue 1 Pages 3-5
Published: January 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe temperature distribution in a cylindrical deposit of combustible dust placed in hot environments is described by a differential equation according to the thermal theory. From the equation, the self-ignition temperature and the induction time to ignition have been determined in this paper by computer simulation, by varying the size of the cork dust deposit. The calculated results become straight lines on a log-log paper plotted against the deposit volume, and were in good agreement with the experimental data currently reported by Leuschke. Hence, it can be concluded that the simulation is usable in predicting self-ignition hazards in the storage and handling processes of fine particles.View full abstractDownload PDF (291K) -
Akitsugu IMAMURA, Yoshinaga TAKAYAMA, Masaaki TAKAHASHI, Mamoru SENNA1987 Volume 24 Issue 1 Pages 6-13
Published: January 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effects of organic additives on the finest comminution obtained by using an impact mill were studied. A commercial disintegrator (Jiyu-Mill M3, Nara Machinery) was modified by installing a recycling circuit and improved vanes. The additives used were triethanol amine (TEA), ethylene glycol (EG), acetic acid (AA) and others up to 5%. In a batch operation, the minimum attainable median particle size was significantly reduced, although the power consumption increased. Powders ground with additives were less edgy and showed smaller compressive strength and mold release resistance. The optimum concentration was between 0.5 and 5wt% which is much higher than that for a conventional ball mill. The characteristics of the mechanism of grinding aids were: (1) grinding energy was more efficiently transmitted on the powder particle by preventing the adhesion of the finest particles on the main parts of the grinding system, and (2) there was an increase in the effective solid concentration.View full abstractDownload PDF (6177K) -
Kunio UCHIDA, Takeshi OHTAKE, Fumikazu IKAZAKI, Kunio KAMIYA, Noboru A ...1987 Volume 24 Issue 1 Pages 14-17
Published: January 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA new device was manufactured to measure the cohesion force between coal fly ash pellets at the sintering temperature. The cohesion force was measured in order to determine the operating condition of sintering a coal fly ash in moving bed furnace.
Following results were obtained:
1) The cohesion force was not detected up to the temperature of 1400K. It increased significantly with the increase of the temperature up to 1430K and decreased gradually at temperatures above 1430K.
2) The contact circle radius between pellets was proportional to the square root of the sintering time. This shows that the coal fly ash was mainly sintered by the viscous flow mechanism.
3) The cohesion force increased with the square of the contact circle radius, in other words with the sintering time.View full abstractDownload PDF (1734K) -
Masumi KOISHI1987 Volume 24 Issue 1 Pages 18-23
Published: January 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3895K) -
Yoshitaka KUWAHARA1987 Volume 24 Issue 1 Pages 36-38
Published: January 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (443K) -
Shinji ASO1987 Volume 24 Issue 1 Pages 48-51
Published: January 10, 1987
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (5085K)
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