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. 101 (2022), No. 10

  • Design and Techno-Economic Analysis of On-site Hydrogen Refueling Station with Solid Oxide Electrolyzer

    pp. 184-195

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    DOI:10.3775/jie.101.184

    System efficiency and investment costs of on-site hydrogen refueling stations (HRSs) adopting hightemperature steam electrolysis with solid oxide electrolysis cells (SOECs) were evaluated, assuming use of electricity derived from renewable energy. In this paper, the techno-economic analysis for the on-site HRSs were conducted, considering technological innovations such as SOEC system, compressor, storage tank, precooler, and dispenser. In the analysis, a conventional small-scale HRS (hydrogen production rate: 300 Nm3-H2/h) was considered and the technological requirements for the investment cost reduction were discussed in terms of improvements of system components. Through the sensitivity analysis based on relevant technological scenarios, we clarified the technological requirements to reduce the costs to the same level as the target investment costs of 200-300 million JPY/station in 2025, Japan.
  • Optimization of Carbonization Condition in CFRP Recycle Process

    pp. 196-204

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    DOI:10.3775/jie.101.196

    The pyrolysis (carbonization) kinetics of carbon fiber reinforced epoxy resin (CFRER) in addition to the effects of its carbonization condition on the calorific values of product gas/tar and the characteristic of recycled carbon fiber (CF) were examined using a commercial thermogravimetric differential thermal analyzer in addition to a lab-scale carbonization reactor in order to optimize the carbonization condition in the recycle process with the carbonization and calcination of carbon fiber reinforced plastic wastes (CFRP). In addition, the optimization of a carbonization condition of CFRER in a bench-scale carbonization reactor was attempted. A higher carbonization temperature and presence of superheat steam increased the calorific values of product gas/tar in the carbonization of CFRER. CF recycled in the carbonization of CFRER at a temperature less than 500 °C was scarcely deteriorated. The pyrolysis kinetics of CFRER were slower than those of nylon and polypropylene resin. The optimization of a carbonization condition of CFRER in the bench-scale carbonization reactor resulted in the highest carbonization temperature of 420 °C and the self-sustained carbonization energy of CFRER by the increase in the use of exhaust heat.
  • Effect of Coal Particle Size on Dilatation

    pp. 205-209

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    DOI:10.3775/jie.101.205

    The thermoplastic characteristics of a packed bed of coal with different particle sizes were investigated in carbonization. The dilatation of the packed bed of coal was examined using a dilatometer, and the amount of volatile matter released from the coal particles was evaluated using a thermogravimetric meter. As a result, the total dilatation (TD) of a coal bed with an average diameter of 67 µm was 127%, and that with an average diameter of 60.5 µm was 80%. We revealed that its particle size affects the swelling of the packed bed of coal. The release behavior of volatile matter (i.e., temperature and the amount of the releases) was different depending on the particle size. Therefore, the release rate and amount of volatile matter depend on the coal particle sizes, and the particle size of coal particles affects the swelling behavior of the packed bed of coal.
  • Tableof Contents (in English)

    p. Tce10_1

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    DOI:10.3775/jie.101.Tce10_1

  • Tableof Contents (in Japanese)

    p. Tcj10_1

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    DOI:10.3775/jie.101.Tcj10_1

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