Journal of the Fuel Society of Japan
Online ISSN : 2185-226X
Print ISSN : 0369-3775
ISSN-L : 0369-3775
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Volume 55, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1976 Volume 55 Issue 1 Pages 1
    Published: January 20, 1976
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.55.1
    JOURNAL FREE ACCESS
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  • Synthesis of methanol from natural gas and methanol combustion
    Mitsushige Nakayama
    1976 Volume 55 Issue 1 Pages 2-11
    Published: January 20, 1976
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.55.2
    JOURNAL FREE ACCESS
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    This paper deals with the explanation of a synthesis of methanol from natural gas and the technological investigation of methanol combustion at power plant.
    The author takes up three important factors for which methanol fuels are untilized at domestic power plants. They are;
    (1) the problem of stabilised supply during long time.
    (2) the problem of economical supply price.
    (3) the problem of combustion characteristics; flue gas status during methanol combustion.
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  • Fuel Reforming in View of low NOx Conbustion
    Kazuo Yamagishi
    1976 Volume 55 Issue 1 Pages 12-21
    Published: January 20, 1976
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.55.12
    JOURNAL FREE ACCESS
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    Refering surveys and experimental data up to the present day, comparison is made in the NOx emission characteristics of several fuels from the standpoints of combustion mechanism, fuel nitrogen, C/H and combustion modifica-tions. It is shown that the NOx emission level falls down proportionally as hydro-carbon fuels become lighter.
    There are two routes by which NOx is formed in the combustion of hydrocarbon fuels. One is the Zeldovich mechanism (thermal NO), the other is the reaction through CH radicals as suggested by Fenimore (prompt NO). It is thermal NO that can be suppressed by the conventional combustion modification. prompt NO as well as fuel NO is difficult to suppress and its emission level is higher in proportion to the carbon number of the hydrocarbon fuels. This results in the higher emission of NOx in the exhaust gas.
    To suppress prompt NO, it is very effective to reform hydrocarbon fuels into simple inorganic gases such as CO and H2 prior to the complete combustion. To materialize this method in actual combustion processes, making use of a light hydro-carbon fuel, some practical means are illustrated.
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  • Fluidized Beds at High Temperatures
    In Connection with Utilization of Coal
    Kunio Yoshida
    1976 Volume 55 Issue 1 Pages 22-29
    Published: January 20, 1976
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.55.22
    JOURNAL FREE ACCESS
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    A number of investigations have been made on the transport phenomena in fluidized beds at room temperature. In practical applications, however, fluidized beds are usually operated at elevated temperatures. Despite this fact, little investigations have been been reported on the temperature dependence of fluidization. In the pressent work an attempt was made to dis cuss several transport phenomena such as heat transfer and reactions in fluidized bedt at high temperatures.
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  • The Tensile Strength of Industrial Cokes (2)
    The Binder Efficiency of Bituminous Coals and Bitumens
    Ichiro Fujishima, Tsugio Miyagawa
    1976 Volume 55 Issue 1 Pages 30-37
    Published: January 20, 1976
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.55.30
    JOURNAL FREE ACCESS
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    In order to exmine the characteristics of bituminous coals or bitumens as binder these materials were carbonized with coke breeze or anthracite fines. The tensile strength of these cokes was measured using indirect tensile test.
    A study of the results has led to the conclusion that there exists a definite correlation between the tensile strength and the binder properties. The efficiency of binder coal such as maximum tensile strength and optimum inert ratio is determined by the type of vitrinite. The aromaticity of bitumens is directly proportional to the tensile strength of coke caronized from bitumen blended inerts. But bitumens examined in this paper have the same value of optimum inert ratio.
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  • Studies on properties and structure of regenerated humic acids (II)
    Studies on properties of acid group in regenerated humic acid by potentiometric titrations
    Hisayoshi Yoshida, Toshiharu Miki, Seiji Arita, Masanao Nakagawa
    1976 Volume 55 Issue 1 Pages 38-51
    Published: January 20, 1976
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.55.38
    JOURNAL FREE ACCESS
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    Tne properties of acid group in regenerated humic acid (HA I) prepared, from bituminous coal by nitric acid oxidation were studied by means of poten-tiometric titration in DMSO and pH titration in comparison with those of other humic acids. Regenerated humic acid (HA II) prepared from bituminous coal by air oxidation, regenerated humic acid (HA III) prepared frombituminous coal by alkali fusion and natural humic acid (HA IV) extracted from lignite had two inflection points in potentiometric titration curve in DMSO, while HA I and regenerated humic acid (HA V) prepared from lignite by nitric acid oxidation had one inflection point. These results indicate that the nitro group introduced in humic acid during nitric acid oxidation enhanced the acidity of phenolic hydroxyl group in humic acid and hence carboxyl group and phenolic hydroxyl group could not be titrated separately.
    The relation between the acid group content of HA I and oxidation condition has been investigated. It was found that the acid group content of HA I increased with increasing in the concentration of nitric acid, reaction time and amount of nitric acid per 1 g of coal.
    The inflection in pH titration curve of regenerated humic acid was sharper than that of natural humic acid. This might be due to the fact that the acidities of acid groups in regenerated humic acid are more uniform than those of natural humic acid. The pH titration of humic acid in the presence of transitional metal ions indicated the formation of humic acid-metal complexes. The order of the magnitude of pH drop of regenerated humic acids on addition of transitional metal ions was found to be Cu++> Zn++>Mn++>Co++>Ni++ and not to follow the Irving-Williams series for the stabilities of metal complexes. The amounts of acid group complexed with Cu++ in HA I and HA II were larger than those of HA IV and HA V. This result suggests that the regenerated humic acid prepared from bituminous coal is more abundant in acid group similar to salicylic and phthalic acids than other humic acids. It was found that phenolic hydroxyl group also took part in the formation of complex between regenerated humic acid and Cu++. Consequently it was suggested that a chelate was formed in the reaction of regenerated humic acid with Cu++.
    A few informations about the acidity of humic acids were obtained from potentiometric titrations.
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