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Fundamental Research on Dissociation Behaviors of Natural Gas Hydrate for the Purpose of Natural Gas Sea-borne Transport

Research Project

Project/Area Number 16360483
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Energy engineering
Research InstitutionNational Maritime Research Institute

Principal Investigator

SHIROTA Hideyuki  National Maritime Research Institute, Ocean Engineering Department, Senior Researcher, 海洋部門深海技術研究グループ, 主任研究員 (40344238)

Co-Investigator(Kenkyū-buntansha) NAKAJIMA Yasuharu  National Maritime Research Institute, Energy and Environment Assessment Department, Senior Researcher, エネルギー・環境評価部門環境影響評価研究グループ, 主任研究員 (30344237)
AYA Izuo  National Maritime Research Institute, Osaka Branch (10415812)
YAMANE Kenji  National Maritime Research Institute, Osaka Branch, Vice Director, 大阪支所, 副支所長 (10358393)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2005: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2004: ¥6,100,000 (Direct Cost: ¥6,100,000)
Keywordshydrate / natural gas / sea-borne transport / self-preservation / dissociation / liquefied natural gas (LNG)
Research Abstract

(a) We first selected two kinds of multi-component gases as simulated natural gas whose component was close to that of actual natural gas, such as a 98:2 CH4:C2H6 mixture and a 94.5:5:0.5 CH4:C2H6:C3H8 mixture. Then, we made natural gas hydrate samples from the multi-component gas and small ice particles with the particle size controlled and with no pelletization processed, and experimentally examined its dissociation behaviors (self-preservation property). As a result, we confirmed that temperature change did not have much influence upon the self-preservation of the multi-component natural gas hydrate for the temperature range from -20 degrees C to -5 degrees C, and a difference in hydrate structure (structure-I or structure-II) did not have influence significantly upon it.
(b) Our experimental results in the present research agreed with the experimental data for natural gas hydrate pellets by Takahashi et al. at Mitsui Engineering & Shipbuilding Co., Ltd., in both that the natural gas hydrate (which includes structure-II hydrate) also had the self-preservation property in the same way as CH4 hydrate (which forms structure-I) and that change of natural gas composition did hardly have influence upon the self-preservation of natural gas hydrate. We can conclude that these results will support validity and feasibility of the concept of applying the self-preservation of gas hydrate to natural gas sea-borne transport.
(c) We compared the results in the present research with several dissociation data obtained in different conditions, and examined the mechanism of self-preservation. Then, we pointed out that several factors (difference in manufacturing method of hydrate samples, difference in thermal history of samples, influence of mechanical compression, and influence of ice content in samples) may be possibly important for elucidation of the mechanism.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (11 results)

All 2006 2005 Other

All Journal Article (11 results)

  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transport2006

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      日本マリンエンジニアリング学会誌 (印刷中)

    • NAID

      10019370771

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transport2006

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      J.Japan Marine Eng.

    • NAID

      10019370771

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Self-preservation Property of Methane Hydrate Pellets in Bulk in Ship Cargo Holds during Sea-borne Transport of Natural Gas2005

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      Proc. 5th Intl. Conf. Gas Hydrates Vol.4

      Pages: 1412-1419

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transport2005

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      Proc. 7th Intl. Symp. Marine Eng.

    • NAID

      10019370771

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Self-preservation Property of Methane Hydrate Pellets in Bulk in Ship Cargo Holds during Sea-borne Transport of Natural Gas2005

    • Author(s)
      Hideyuki, Shirota, et al.
    • Journal Title

      Proceedings of the 5th International Conference on Gas Hydrates Vol.4

      Pages: 1412-1419

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transport2005

    • Author(s)
      Hideyuki, Shirota, et al.
    • Journal Title

      Proceedings of the 7th International Symposium on Marine Engineering (CD-ROM)

    • NAID

      10019370771

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Self-preservation Property of Methane Hydrate Pellets in Bulk in Ship Cargo Holds during Sea-borne Transport of Natural Gas2005

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      Proc.5th Intl.Conf.Gas Hydrates

      Pages: 1412-1419

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transport2005

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      Proc.7th Intl.Symp.Marine Eng. (CD-ROM)

    • NAID

      10019370771

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Self-preservation Property of Methane Hydrate Pellets in Bulk in Ship Cargo Holds during Sea-borne Transport of Natural Gas2005

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      Proceedings of the 5th International Conference on Gas Hydrates

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transportation2005

    • Author(s)
      Hideyuki Shirota et al.
    • Journal Title

      Proceedings of the 7th International Symposium on Marine Engineering

    • NAID

      10019370771

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Experimental Study on Self-preservation Property of Gas Hydrate for Natural Gas Sea-borne Transport

    • Author(s)
      Hideyuki, Shirota, et al.
    • Journal Title

      Journal of The Japan Institution of Marine Engineering (in press)

    • NAID

      10019370771

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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