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. 86 (2007), No. 4

  • Optimum System Design for Effective Utilization of Livestock Manure in Rural Area

    pp. 256-264

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    DOI:10.3775/jie.86.256

    A linear optimization model to design livestock manure disposal system has been developed. The model can design the most economically efficient disposal system under the restriction of nitrogen supply, which has to be less than nitrogen demand in agricultural land to prevent water and land pollution. The livestock manure considered in the model are dairy cattle, beef cattle, swine, and poultry excreta. The disposal facilities considered here are composting, carbonization, wet methane fermentation, dry methane fermentation and poultry manure boiler. The optimization model has been applied for case study focused on Tome-city with four scenarios, such as scenario 1; reference case, scenario 2; subsidy for biogas plant case, scenario 3; facilitation of organic fertilizer utilization case, and scenario 4; combination of scenario 2 and 3. In the reference case, because of low demand for organic fertilizer, much of the live stock manure is processed in carbonization facility and not utilized as compost or liquid fertilizer. The result indicates that the facilitation of organic fertilizer utilization is the best policy option to maximize economic efficiency. Moreover, the combination of subsidy for biogas plant and facilitation of organic fertilizer utilization is the best policy option for energy utilization of livestock manure.
  • Optimum Conditions for Gasification in Dual Fixed Bed Gasifier

    pp. 265-269

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    DOI:10.3775/jie.86.265

    Optimum conditions for gasification of wood chips were experimentally investigated in dual, small-sized fixed bed gasifier (153mm φ × 420mmH) with air. The experiments have been performed using two different sizes of wood chips (41 × 14 × 5mm ; 13 × 8 × 3mm).
    As a result, the gasification temperature of 1173-1273K in the gasifier may be optimal to gasify the wood chips. The gaseous product from the large-sized wood chips can be used as a gaseous fuel (higher heating value, 5990kJ/Nm3) for internal combustion engines.

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