Explosion Damage Caused by Polydisperse Fine Powders: Simulation Reveals Coal Dust Combustion and Safety Assessment

2021 Fiscal Year Final Research Report

• Project/Area Number: 18H01387
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Keio University
• Principal Investigator: Akiko Matsuo 慶應義塾大学, 理工学部(矢上), 教授 (70276418)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 爆発 / 固気混相流 / 数値解析 / 燃焼 / 安全評価

Outline of Final Research Achievements

A new analytical method for compressible particle flow with reactive particles was developed by combining numerical fluid dynamics and the discrete element method, and particle behavior was investigated for a problem involving the dispersion of deposited particles due to shock waves. A new analytical model was developed to track the particle behavior in the particle-thin region, which cannot be captured by the conventional two-fluid model based analytical method for the target problem. Numerical analysis of shock wave-induced combustion of sedimentary coal dust was also performed, and the validity of this method for polydisperse combustion problems was demonstrated through comparison with experimental data. The structure of the combustion wave during steady-state propagation was also clarified from the analytical results.

Free Research Field

圧縮性流体力学, 燃焼工学, 航空宇宙工学

Academic Significance and Societal Importance of the Research Achievements

21世紀に至り，安全技術の進歩にも関わらず粉塵をエネルギー源とする爆発事故が世界および日本において増加傾向にあり、粉塵爆発は粒子を取り扱う産業において常に発生する可能性を有している。粉塵爆発発生には粒子が空気中に浮遊して十分に分散した状態が必要であることから、空気中に分散した状態の粒子群中で引き起こされる粉塵爆発に関して多くの成果が報告されているが、堆積した粉塵(堆積粉塵)の巻き上げ過程を含んだ粉塵爆発に対する研究は少ない。堆積粉塵燃焼は自着火することが無いため、安全対策として必要となる予防技術としては，一次爆発から堆積粉塵燃焼へ遷移過程の解明と爆発へ至る条件の解明が必要である。