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Electric power control of a power generator using dissociation expansion of a gas hydrate

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  • Obara, Shin'ya
  • Mikawa, Daisuke

Abstract

The unique dissociation expansion characteristics of gas hydrates allow a large pressure difference to be obtained from a small change in temperature. This suggests that a clean actuator system may be built that can use low temperature heat from the nighttime air and high temperature heat from daytime solar radiation or other sources. This study proposed a generator that could operate using a small temperature difference, by leveraging the change of state of a gas hydrate. The dynamic characteristics of an alternating current power supply from a gas-hydrate power-generation system (GHGS) have not previously been reported. The objective of the study was to achieve an electric power supply of acceptable quality (frequency and voltage) from a GHGS while tracking demand. A pressure regulating valve under P-I control was used to adjust the supply of high-pressure dissociated gas to the actuator. As the GHGS was of the batch type, a hybrid system including a conventional gas-powered generator was also investigated. A numerical analysis showed that, when a flywheel with an inertia constant of 6.9 kg/m2 was installed, the hybrid system was able to provide a stable electricity supply for an individual house.

Suggested Citation

  • Obara, Shin'ya & Mikawa, Daisuke, 2018. "Electric power control of a power generator using dissociation expansion of a gas hydrate," Applied Energy, Elsevier, vol. 222(C), pages 704-716.
    • Handle: RePEc:eee:appene:v:222:y:2018:i:c:p:704-716
    DOI: 10.1016/j.apenergy.2018.04.031
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    References listed on IDEAS

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    Cited by:

    1. Kawai, Masahito & Obara, Shin'ya, 2021. "Study on a carbon dioxide hydrate power generation system employing an unstirred reactor with cyclopentane," Energy, Elsevier, vol. 230(C).
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    4. Kawasaki, Toshiyuki & Obara, Shin'ya, 2020. "CO2 hydrate heat cycle using a carbon fiber supported catalyst for gas hydrate formation processes," Applied Energy, Elsevier, vol. 269(C).
    5. Thakre, Niraj & Jana, Amiya K., 2021. "Physical and molecular insights to Clathrate hydrate thermodynamics," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).

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