Journal of the Fuel Society of Japan
Online ISSN : 2185-226X
Print ISSN : 0369-3775
ISSN-L : 0369-3775
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Volume 70, Issue 5
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 70 Issue 5 Pages 381
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.381
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 70 Issue 5 Pages 382-388
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.382
    JOURNAL FREE ACCESS
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  • Current and Future of Pulse Combustion and its Technique
    Ken KISHIMOTO
    1991 Volume 70 Issue 5 Pages 389-403
    Published: May 20, 1991
    Released on J-STAGE: February 23, 2011
    DOIhttps://doi.org/10.3775/jie.70.389
    JOURNAL FREE ACCESS
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    Pulse combustion has comparably good performances, low NOx and CO emission, high heat transfer rate and high heat loading compared with ordinary steady-state combustion. In this paper, the principle of pulsating combustion, mechanisms to determine its frequency and intensity of oscillation automatically and the reasons for above performances are mentioned on the both bases of combustion science and application techniques.
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  • Pulse Combustion and its Application
    Hajime TOYONAGA, Hiroyuki HASEBE
    1991 Volume 70 Issue 5 Pages 404-411
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.404
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    Pulse combustion can gain high pressure flue, utilizing the combustion-driven oscillation phenomena. This well-kuown technology has been realized recently by the advance in new technology and also the demand to energy saving. The majour problems in the burner development are how to tune the total system and how to cut noise. The burner was applied as the industrial liquid heater and proved to be highly efficient, not only because of the heat transfer improvement but because of the small heater size. Applications to the painting process and to the galvanizing process were introduced.
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  • The Investigation Study for the Japanese Patents on the Coal liquefaction Technology
    Mizuho HIRATO
    1991 Volume 70 Issue 5 Pages 412-418
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.412
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    This is the report of the investigation for the Japanese patents on the coal liquefaction technology from 1988 to 1990.
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  • Application of the low lank cokes to the Multi-stage formed coking process and Effects of aromatic compounds on the tar yield during the preheat-treatment
    Isao MOCHIDA, Hisashi NAKAGAWARA, Yorimasa TOMITAKA, Yozo KORAI
    1991 Volume 70 Issue 5 Pages 419-423
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.419
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    Multi-stage coking was applied to non-fusible coals to produce both formed cokes of high mechanical strength and more amount of tar. The pressurized preheating and the solvent extraction with THE or pyridine provided the strength of the formed coke above 50kgf/cm2 and extractable tar above 20% (coal base yield) from Cerrejon, Optimum, Illinois No.6, and Taiheiyo coals.
    The heating rate of 10°C/min appears to be esssential to obtain the strength of the satistactory level.
    Thus, non-fusible coals of the present study were found applicable for the production of the blast fusible coke through the multi-stage coking.
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  • Evaluation of Decrease in Coal Char Gasification Rate Constant at Final Stage of Gasification by a Model Assuming Two Activity-Different Reactants
    Shohei TAKEDA, Mashiki IKEGAMI, Kunihiro KITANO, Nobutsune TAKEZAWA, T ...
    1991 Volume 70 Issue 5 Pages 424-430
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.424
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    A reaction model is proposed to evaluate the decrease in the gasification reaction rate constant observed in the final stage of coal char gasification. The model assumes that two components of char having different reactivities for gasification are formed as a result of coal pyrolysis. A component (C1) with the higher reactivity is assumed to convert directly to gases while another (C2) with the lower reactivity to convert to gases via a less reactive solid intermediate.
    The model has been tested for kinetic data of CO2 or steam gasification observed for four different kinds of coal chars, a commercial graphite and a calcinated pitch coke at temperatures from 1073 to 1273K and under pressures of 0.8 and 1.6MPa. The results of comparison between conversions observed and estimated by the present model showed that the model explains well the decrease in the reaction rate constant as well as the effect of char natures. Furthermore, the model was found to give more accurate description of the data than our previous empirical model based on a modified unreacted-core model.
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  • Catalytic Acitvities of S-promoted Iron Oxide Catalysts for Hydroliquefaction of Coals
    Takeshi KOTANIGAWA
    1991 Volume 70 Issue 5 Pages 431-439
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.431
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    In this paper, catalytic activities of S-promoted iron oxide catalysts for different types of coals are described. The catalysts used were FeS2 as a sulphide, and ammonium sulphate and Fe2O3 (SO4) 2- as sulphates. Three kinds of coals such as Akabira, Taiheiyo and Yallourn were tested under different atmospheres in the presence of these catalysts. The results were discussed in the relation between hydrogen consumption for hydroliquefaction and H/C as well as structural parameters of benzene soluble fractions.
    Findings were as follows; ammonium sulphate showed only dehydrogenation activity which is not useful for the hydroliquefaction. Catalyst Fe2O3 (SO4) 2- showed sufficiently high activity for hydrocracking and hydrogenation of aromatics. Catalyst FeS2 showed higher activity for hydrogenation of aromatics than for hydrocracking of them. The most desired catalyst for the hydroliquefaction of coals was found to be a complex of FeS2 and Fe2O3 (SO4) 2-. Further findings were that Akabira coal was reformed to highly aromatic fraction and produced much more C1-C5 hydrocarbons by dealkylation than the others. Taiheiyo coal was cleaved by dealkylation and hydrocracking and Yallourn coal formed the products with similar structural parameters without depending upon types of the catalysts and hydrogen consumption.
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  • Rapid Pyrolysis of Coals in a Down-flow Reactor (II)
    Analysis of Taiheiyo Coal Tars by GC/MS
    Mikio MORITA, Kunio HIROSAWA
    1991 Volume 70 Issue 5 Pages 440-451
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.440
    JOURNAL FREE ACCESS
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    In the previous paper, a rapid pyrolysis of coals in a down-flow reactor, heated by a carrier such as silica sand, was shown to become a feasible prosess in a coal pyrolysis and combustion combined system. In the present study, fractions below 360°C of Taiheiyo coal tars, recovered in the previous experiments, were analyzed by a GC/MS to obtain basic data for their uses.
    A tar fraction produced at 600°C contained 453 components, which were n-paraffins, n-oleffins, alkylbenzenes, alkylindanes, alkyltetralins, alkylnaphthalenes, alkylbiphenyls, alkyldiphenylmethanes, alkylanthracenes, alkylphenanthrenes, alkylphenols, alkylnaphthols, alkylpyrenes and alkylfluorathenes.
    Otherhand, a tar fraction produced at 800°C was secondarily pyrolyzed and consisted in 249 components, which mainly were phenols, naphthalens, biphenyls, acenaphthenes, fluorenes, anthracenes and phenanthrenes. Pyridines and quinolines were also contained as basic components.
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 70 Issue 5 Pages 452-459
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.452
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 70 Issue 5 Pages 463
    Published: May 20, 1991
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.70.463
    JOURNAL FREE ACCESS
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