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Elucidation of the unsteady pyrolysis mechanism of combustible solids based on in situ visualization

Research Project

Project/Area Number 20K04331
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionAkita Prefectural University

Principal Investigator

Daitoku Tadafumi  秋田県立大学, システム科学技術学部, 助教 (40452049)

Co-Investigator(Kenkyū-buntansha) 鶴田 俊  秋田県立大学, システム科学技術学部, 教授 (90197773)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsイメージング / 熱分解 / 熱物質移動 / 固体燃焼 / 木質バイオマス / 超高速X線CT / 熱工学 / 可視化 / X線ラジオグラフィ / 可燃性固体
Outline of Research at the Start

バイオマスエネルギー変換技術への貢献は,持続可能なバイオマスエネルギー利用の実現が期待される.本研究では木質系バイオマスを対象とし,熱分解により内部に温度および構造の分布を生じる条件下において,試料の内部が変化していく過程を放射光X線による高速非破壊可視化手法を適用する.内部の構造・組成・成分の非定常変化を定量的に評価し,木質系バイオマスの熱分解および燃焼メカニズムの解明を目的とする.ひいては,熱的に厚みを持った固体の燃焼および熱分解現象についての,内部構造の非定常変化を考慮した固体の燃焼理論の構築を目指す.

Outline of Final Research Achievements

In this study, the microscopic visualization of the pyrolysis of woody biomass was conducted using the BL20B2 beamline at “SPring-8,” a large synchrotron radiation facility. Changes in the shape and internal structure of the woody biomass were visualized using ultra-high-speed computerized tomography (CT). The sample was a Japanese cypress wood with a height of 5 mm and diameter of 5 mm. We used radiation as the heat source to achieve a high heat flux. When the heat flux is high, the sample expands. Gaps were observed in the sample. Compared with the experimental results under the low heat flux obtained in the previous study, we observed a completely different aspect. In a nitrogen or air atmosphere, the internal structure of the wood during transient pyrolysis was visualized using ultra-high-speed X-ray CT. In addition, the schlieren method was used to study the pyrolysis behavior of the woody biomass and the behavior of the pyrolysis gases.

Academic Significance and Societal Importance of the Research Achievements

持続可能なバイオマスエネルギー利用の観点から,本研究では木質系バイオマスを対象とし,エネルギー変換技術への貢献を目指した.熱分解により内部に温度および構造の分布を生じる条件下において,試料の内部が変化していく過程を放射光X線による超高速非破壊可視化手法を適用した.熱分解により時々刻々と変化する内部構造を定量的に評価することが可能となった.本研究では木質系バイオマスを対象としたが,得られた結果は,ひいては,熱的に厚みを持った固体の燃焼および熱分解現象について,内部構造の非定常変化を考慮した理論構築の進展が期待できると考える.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2023 2022 2021 2020

All Journal Article (2 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Real-time Measurement of Internal Structural Changes of Woody Biomass Pyrolyzed under High Heat Flux using Ultra-high-speed X-ray CT2023

    • Author(s)
      大徳 忠史、鶴田 俊
    • Journal Title

      Journal of the Japanese Society for Experimental Mechanics

      Volume: 22 Issue: 4 Pages: 265-270

    • DOI

      10.11395/jjsem.22.265

    • ISSN
      1346-4930, 1884-4219
    • Year and Date
      2023-01-13
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 高熱流束下で熱分解する木質バイオマス内部の非定常構造変化の超高速X線CT計測2021

    • Author(s)
      大徳忠史,小川卓也,小林広樹広樹
    • Journal Title

      SPring-8 利用課題実験報告書

      Volume: -

    • Related Report
      2020 Research-status Report
  • [Presentation] Measurement of Internal Structural Changes during Pyrolysis of Wooden Pellets under a Radiant Heating Field using Synchrotron X-ray CT2023

    • Author(s)
      Tadafumi Daitoku, Takashi Tsuruda
    • Organizer
      The 29th International Colloquium on the Dynamics of Explosions and Reactive Systems
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MEASUREMENT OF TRANSIENT STRUCTURAL CHANGES DURING PYROLYSIS OF WOODEN BIOMASS UNDER HIGH HEAT FLUX USING ULTRA-HIGH-SPEED X-RAY CT2022

    • Author(s)
      Tadafumi Daitoku and Takashi Tsuruda
    • Organizer
      The 32nd International Symposium on Transport Phenomena
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高熱流束下での木質バイオマスの熱分解とガス噴出挙動の観察2021

    • Author(s)
      竹山瑞希,大徳忠史,鶴田俊
    • Organizer
      第58回日本伝熱シンポジウム
    • Related Report
      2021 Research-status Report 2020 Research-status Report
  • [Presentation] ふく射加熱された木材のリアルタイム内部可視化計測2021

    • Author(s)
      大徳忠史,鶴田俊
    • Organizer
      2021年度日本火災学会研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] エレクトレットコンデンサマイクを用いた熱分解過程にある可燃性固体の破壊検出2020

    • Author(s)
      大徳忠史,鶴田俊
    • Organizer
      第58回燃焼シンポジウム
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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