Journal of the Japan Institute of Energy
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ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 83 (2004), No. 9

  • Basic Study on Mineral Removal from Coal

    pp. 733-739

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    DOI:10.3775/jie.83.733

    Increasing the coal demand in the future, the industry has to utilize kinds of unused coals such as highash type of coals. Therefore, the mineral removal technology from raw coal is important to improve trans-portability, and to decrease the cost of ash treatments. In this study, the mineral distribution in the raw coal was investigated to develop an effective removal method of mineral matter. The influence of the mineral distribution on removal ratio of mineral matter from coal was evaluated by specific gravity separation. It was found that the removal of small minerals with line shape or cloudy shape minerals from coal were difficult. And also the effect on elimination of inorganic trace elements with mineral removal was examined. The content of the inorganic trace elements decreased with increasing mineral removal ratio. These results showed that mineral removal from raw coal could eliminate inorganic trace elements at the same time.
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  • Gasification of Stockbreeding Waste in Supercritical Water

    pp. 740-744

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    DOI:10.3775/jie.83.740

    Supercritical water gasification of the pig urine which was employed as a model of stockbreeding waste was studied. Reaction temperatures ranged from 673 to 873K and pressures ranged from 21 to 25MPa. Activated carbon particles were filled in the reactor as a catalyst. The effect of reaction temperature, pressure, residence time, and the reactant concentration on the reaction characteristics such as gas formation and total organic carbon content were studied. As a result, activated carbon promoted thegasification of the pig urine, and under the conditions of 873K, 25MPa, 60s of residence time, and 10.6g of activated carbon addition, the pig urine was almost completely gasified and the gas mixture with a high hydrogen content (45.5vol%) was obtained. Under the conditions of this study, the increase of reaction temperature, pressure, and residence time resulted in the enhancement of both the gas yield and the carbon gasification efficiency.
  • Catalytic Decomposition of Chlorofluorocarbons with Directly Induced Heating System

    pp. 745-750

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    DOI:10.3775/jie.83.745

    Decomposition of Chlorofluorocarbons by a honeycomb packing with Pt/WO3/TiO2 catalyst heated directly with an electromagnetic induced heating system was investigated at temperature of 400°C. The decomposition of CFCs in the heating system was found to give higher conversion than in a conventional heating method, which can be attributed to a higher controllability of reaction temperature in the system. The characterization of catalysts showed that the amount of coke formed on the catalyst after the reaction in the system was lower than in the conventional heating system.

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