Journal of the Fuel Society of Japan
Online ISSN : 2185-226X
Print ISSN : 0369-3775
ISSN-L : 0369-3775
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Volume 30, Issue 3-4
Displaying 1-17 of 17 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1951 Volume 30 Issue 3-4 Pages 63
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.63
    JOURNAL FREE ACCESS
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  • Trends of the Coal Mining Industry in Japan
    Keiji Onuki
    1951 Volume 30 Issue 3-4 Pages 64-72
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.64
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    The coal production of Japan gradually increased since the begining of the Meiji era and in 1919 it reached 31, 270, 000 ton per year Then, because of the reactive panic, it decreased and the rationalization of management had been strongly cried out until the begining of the Showa era.The efforts of this rationalization of management that had been cultivated during a long period of dulness, with the progress of technology, resulted in the appearance of an age of high efficiency that ranged from 1930 to 1936 in spite of the world-wide panic that started in 1929 and the maximum efficiency in 1933 was 226.5 ton per person per year With the outbreak of the Sino-Japanese Affairs, Japanese coal mining industry was strongly stimulated and its production in 1940 reached 56, 310, 000 ton per year.
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  • Present Situation of Petroleum Industry in Japan
    Yaichi Sasaki
    1951 Volume 30 Issue 3-4 Pages 73-77
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.73
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    For the reasons of the limited production of crude oil, the employment of labourer, and the saving of foreign currency, the petroleum policy in Japan must be to adopt the direction of“crudes import and its domestic refining”.The import of crudes, which was the basis of this policy, has been almost stabilized at present by the cooperation of domestic refinng companies with foreign capitals. Then, if the considerable change in the world political relationships does not happen, the crudes import in future will progress satisfactorily, because the relation of demand and supply of petroleums in the world is now balanced.Although the oil tanker problems for the crudes import should be noticed, the troubles with them may be about dissolved. However, the accumulation of the imported crudes to prepare against the emergency besides the normal importation must be performed as soon as possible.In the Japanese: refining industries at the present time;it is necessary to improve the, refining technics as well as to lower the refining cost by introducing the modern technics and apparatus from the foreign countries, and the expansion of refining capacity is also one of the important problems.Lastly, it is desired eagerly to abrogate the petroleum control, of the government from the several view-points.
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  • Fuel Problem in Iron Manufacturing Industry
    Mikiji Kaharu
    1951 Volume 30 Issue 3-4 Pages 78-81
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.78
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    Since the manufacture of blastfurnace coke from Japanese coals was achieved: by blending North Chinese coking coal, large blast furnaces likely to that of foreign countries in capacity have been used in Japan, and even now their operation depends entirely on the blending of foreign coals with the domestic coals owing to the low cokability of the latters.
    The following items, therefore, have long been under consideration:
    1)The operation of smaller blastfurnaces.
    2) The preparation of hard coke from domestic coals alone.As regards the first item, the author desired to have the following plan realized.
    1) Prohibition of the use of coke manufactured by the blending of foreign coals with domestic ones in the blastfurnace of the capacity less than 1, 400 t.
    2) Priority in operation of blastfurnace less than 400 t.
    3) Subsidies for disadvantages due to the use of weak coke from domestic coal.As regards the second item, in order to bring up some preparation processes, e. g., the“KORAITO ” (semi-coke)process at Wanishi Iron Works, the author stressed as follows:
    1)Use of coke prepared by blending foreign coals should be only permitted in the blasfurnaces larger than 400t.
    2)Amount of foreign coals in blend should be limited to 35%.
    3)Subsidies corresponding to one-quarter of the cost of saved foreign coals should be payed to coke-manufacturer.
    4)Besides abdve, compensatory subsidies not exceeding 3% of the total manufac-turing cost of the pig-iron produced should be given to iron-manufacturer, if the blastfurnace is operated without fereign coals.
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  • Dehydration of Low Temperature Tar(I, II)
    Takatoshi Yoshida
    1951 Volume 30 Issue 3-4 Pages 82-87
    Published: April 30, 1951
    Released on J-STAGE: October 21, 2011
    DOIhttps://doi.org/10.3775/jie.30.82
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    (I)Mechanism of Dehydration by Microscope The author exami-ned the mechanism of the dehydration of low temperature tar by microscope.The dehydration of low temperature tar and the removal of free carbon and coal dust from it is difficult through a mere physical treatment.But the adding of light oil produced by fractionating the low temperature tar, facilitates these operations.In this research, the dehydration was attained by the blending of such materials as acidic, neutral or basic components of the light oil, and among them the acidic oil has been recognized as most effective.
    (II)Effect of Centrifugal Separation In the dehydration Method described above, the effective ratio of light oil to tar is 2-3: 1, but when the centrifugal separation is combined with it, the ratio can be reduced to about half and heat consumption recovering the light oil become smaller.
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  • Utilization of Wood-Tar(III, IV, V)
    Kakusaburo Onda
    1951 Volume 30 Issue 3-4 Pages 88-94
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.88
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    (III)The Coking Property of Wood-Tar Pitch The properties of pitches obtaind from pine-root oil in different ways were tested and it was found that treatment of crude oil with air at low temperature is a successful method to increase the yield of pitch and also its caking property.Some references were givento the mechanism of air blowing.<BR(IV)The Compressibility of Wood-Tar Pitch obtained by Air-Bath Distillation Considering that different results would be givan.by air-bath distillation or by distillation without bath, pine-oil pitches were prepred by the latter method and compression strengths of briquetts which include those pitches as binders were compared.These tests also verified the effectiveness of air treatment, though pine-oil pitches had some differences from coal-tar pitches on the blending conditions with coke breezes.
    (V)The Constituent of Wood-Tar Pitch To study the cause for the increase of caking property of pitch by air treatment, the change of the composition of pitch was investigated.
    Analytical data showed that air treatment did not cause simple oxidation but polymerizations and decompositions of various types catalyzed by oxygen in air.
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  • Locomotive Engine equipped with Mechanical Stoker
    Susumu Yokohori
    1951 Volume 30 Issue 3-4 Pages 95-99
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.95
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    After discussing the merits of every kinds of mechanical stoker of locomotive engine historically, the author explains the mechanism and ability of steam jet system splatter stoker which has come to be applied to locomotive engines in this country.
    The mechanism is as follows the coal is transported from tender to furnace inlet automatically by screw conveyer which is set between them, and crushing of coal is also carried out.At f urnace inlet, after coal is fallen on the splatter table, splashed out on grate by steam jet.The uniformity of coal splash is maintained by the guide plate on spaltter table and jet velocity.The prime mover of conveyer is 2 cylinder double acting steam engine, and steam consumption for prime mover and jet is about 1-2% of steam generated.
    The ability of coal transportation is very good for a large range of 450 kg/hr-1925 kg/hr.An example of crushing ability of coal is reported that if coals of only 25-35mm diameter are, fed, the size at outlet of conveyer is under 13mm diameter 52%, original size being 13%.
    By the use of this mechanical stoker, the combustion is very much improved, and for example, when excess air is 25%, by hand fired system C0% is 0.4%, but by this stoker, it is decreased to 0.05%.The reason of this improvement is the decrease of excess air during coal charging and the improvement of combustion by steam jet.
    But, on the contrary, the boiler efficiency is decreased than by hand fired system.And by actual test on rail road, when combustion rate is 400-450 kg/m2hr, calorific value of coal being 5510 kcal/kg, the boiler efficiency is lower about 6% than by hand fired system, and this is about 7% increase by coal consumption.The reason of this is supposed to be the increasement of cinder loss.
    But, these shortcoming is perhapg improved before long, and with the increasement of locomotive boiler capacity, the mechanical stoker will become indispensable.
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 100-103
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.100
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 104
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.104
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 104a-105
    Published: April 30, 1951
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.3775/jie.30.104a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 105
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.105
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 105a-106
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.105a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 106
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.106
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 106a-108
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.106a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 109-111
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.109
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 111-113
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.111
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 3-4 Pages 113-114
    Published: April 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.113
    JOURNAL FREE ACCESS
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