ピンボール 木の豆ミックス2

Journal of the Hydrogen Energy Systems Society of Japan
Online ISSN : 2436-5599
Print ISSN : 1341-6995
Volume 28, Issue 2
Displaying 1-10 of 10 articles from this issue
  • [in Japanese]
    2003 Volume 28 Issue 2 Pages 1
    Published: 2003
    Released on J-STAGE: July 21, 2022
    DOI
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • Eiji INOUE, Keiichi KOMAI
    2003 Volume 28 Issue 2 Pages 2-7
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    Steel making process consumes a lot of energy and exhausts carbon dioxide. From this point of view, scraps shall be recycled and used more for steel making. In case of using scraps, virgin iron source such as direct reduced iron (DRI) is required to dilute impurity of recycling scraps. Iron carbide (Fe3C) is one of DRI having characteristics such as non-pyrophoric and carbon carrier. As conventional method, iron carbide is directly charging into electric arc furnace and smelting to produce steel with energy generation by converting carbon into carbon monoxide. This paper presents alternative method of using iron carbide. At around 700 degree C, iron carbide is producing iron (Fe) and syngas (mainly H2 and CO) reacting with steam. Applying this characteristic to steel making process, iron is charging into electric arc furnace and hydrogen (or electricity) is supplied to users. As a result, energy consumption and CO2 generation can be reduced by co-production of iron and hydrogen. Base on this concept, reaction test and conceptual design of this process were carried out and the results are introduced on this paper.

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  • Takeo Arai, [in Japanese], Kozo Shinoda, Kazuyuki Tohji
    2003 Volume 28 Issue 2 Pages 8-14
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS

    We describe the development of the nano-size CdS catalyst having stratified structure that efficiently separates electron and hole during photolysis. In a way, the stratified structure enabled the production of a reaction system that resembled the one in biological cells. Furthermore, using this catalyst along with materials such as, calcium hydroxide, seawater and H2S, we succeeded in producing about 7.5 l/h m2 of hydrogen gas under the sunlight. In the near future, this system will be applied for a harmless technology of hydrogen sulfide and at the same time, a production method of hydrogen with hydrogen sulfide generating in a sewage disposal plant.

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  • Minoru SUZUKI, Katsuhiro IWASAKI, Takashi NAKAYAMA
    2003 Volume 28 Issue 2 Pages 15-19
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    To produce hydrogen-contained gas from carbonaceous or hydro-carbon materials, such as waste plastic, heavy oil and so on, shock wave reactor was expected to enhance steam reforming with waste steam. Basic experiments were examined to using a converging-type shock wave reactor in which either nitrogen or helium was used as a driving gas instead of waste steam. The main results obtained from these experiments are as follows : (1)Hydrogen-contained gas can be produced from hydro-carbon materials by using shock wave. (2) Amount of produced hydrogen-contained gas strongly depends on initial gas temperature in a reactor.

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  • Patrick TAKAHASHI, Stephen MASUTANI, Kenji SUMIDA
    2003 Volume 28 Issue 2 Pages 20-28
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    While the Green Revolution improved grain cultivation and has been recognized as an important accomplishment of science, the Blue Revolution promises much more. All indications are that the Next Frontier is not space, but the open ocean. At 1000 meter depths in the region bounded by the Tropics of Cancer and Capricorn, is nutrient-rich seawater at 4°C, that can serve as a cold thermal sink for ocean thermal energy conversion (OTEC) systems to produce electricity, and as fertilizer to sustain mariculture activities. If only one part in ten thousand of the daily insolation falling in this band can be converted to useful products, the food and energy needs of society would be satisfied in-to the foreseeable future. This warm portion of the ocean is characterized as a wet desert, for the net primary productivity is low at around one-tenth that of tropical rain forests. However, as certain aquatic species are known to be from two to five times more efficient than any terrestrial plant, if technology can be developed to utilize this currently unused resource base, at hand will be a vast region providing immense sustainable resource and habitat opportunities. The Blue Revolution promises this broad package of natural products, only one possible option being hydrogen fuel.

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  • Masao Hori
    2003 Volume 28 Issue 2 Pages 29-36
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    Features and technologies to produce hydrogen using nuclear energy are reviewed. For the world under constraint of environment and resource, the sustainable bulk supply capability is one of the important features of producing hydrogen as well as generating electricity from nuclear energy. Production technologies, such as the electrolysis of water by nuclear electricity, thermochemical decomposition of water by nuclear heat, and nuclear-heated steam reforming of natural gas, are under development in Japan and other countries. Cost competitiveness of nuclear production is one of the issues to be solved for commercialization, although nuclear-produced hydrogen is economically advantageous to fossil-derived hydrogen when compared by the total cost incorporating the green house gas effect by carbon dioxide emission. These hydrogen production technologies and also the nuclear reactors to supply energy to them are in differing stages of development. It is technologically possible to produce hydrogen at present using the nuclear electricity from Light-Water Reactors and the conventional electrolysis. Hydrogen production through nuclear-heated steam reforming of natural gas is viewed as an intermediate step to the ultimate target of clean and efficient hydrogen production by thermochemical decomposition of water by nuclear heat.

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  • Norifumi Horibe, Akimitsu Ishihara, Shigenori Mitsushima, Nobuyuki Kam ...
    2003 Volume 28 Issue 2 Pages 37-41
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    Polymer electrolyte fuel cell (PEFC) systems have been under developing for residential cogeneration systems and electric vehicles. Energy conversion efficiency should increase and the cost should be reduced for the practical application. Therefore, activity of electrocatalysts based on platinum must be improved for the oxygen reduction reaction, because the efficiency loss of the overpotential by the oxygen reduction reaction (ORR) is the biggest among the efficiency losses.

    Pt/WOx electrocatalyst was known as anti-CO poison electrocatalyst for the oxidation of CO contain H2 fuel, but the activity for the ORR has not been investigated. In this study, the activities of the anodic and the cathodic WOx electroplated electrodes on Pt have been studied for the ORR. The Pt surface area of the anodic electroplated electrode seemed to increase during the potential scanning, and the apparent current density of the ORR increased. For the cathodic electroplated electrode, the ORR was observed from higher potential than that for Pt electrode, but the activity of the cathodic electroplated electrode was less than Pt electrode in the region lower than 0.9 V. These behaviors might be caused by the interaction between Pt and the WOx. The anodic electroplated electrode with large real surface area was stable after potential scanning, but WOx made by the cathodic electroplated electrode dissolved slowly.

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  • M. Fujii, A. Ishihara, S. Mitsushima, N. Kamiya, K. Ota
    2003 Volume 28 Issue 2 Pages 42-46
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    In order to attain the sustainable growth of human beings, the clean energy system should be constructed. The system should not destroy the global environment. However, CO2 concentration in the atmosphere is increasing and the green house effect is expected. In the paper, the global recycles of carbon and water ware compared quantitatively. The existence of water is 27,000 times larger than that of carbon. The transportation of water is 3,160 times faster than that of carbon. These figures should that the hydrogen from water might be a superior energy carrier, compared to the carbon.

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  • [in Japanese]
    2003 Volume 28 Issue 2 Pages 47-59
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    This Roadmap provides a blueprint for the coordinated, long-term, public and private effects required for hydrogen energy development. Hydrogen provides high efficiency, can be produced from a variety of domestically available resources, and offers near-zero emissions of pollutants and greenhouse gases.

    The first step in that process resulted in publication of the National Vision of America’s Transition to a Hydrogen Economy. This Roadmap represents the next step in that process.

    Hydrogen has the potential to play a major role in future energy system. This Roadmap outlines key issues and challenges in hydrogen energy development and industry can take to expand use of hydrogen-based energy.

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  • Makoto Sakurai
    2003 Volume 28 Issue 2 Pages 60-62
    Published: 2003
    Released on J-STAGE: July 21, 2022
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    The European hydrogen energy roadmap was published by the High Level Group for Hydrogen and Fuel Cells as a summary report. The importance of hydrogen energy and fuel cell technologies were emphasized in the report. A future energy plan in Europe until 2050 was also shown in it. An outline of the roadmap was summarized.

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