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• W3049400277 endingPage "123680" @default.
• W3049400277 startingPage "123680" @default.
• W3049400277 abstract "To intensively investigate chemical kinetic behaviors at the initial stage of CH4/H2/air mixture thoroughly, the density functional theory (CAMB3LYP/6−31 G) and a detailed mechanism (GRI-Mech3.0) were used to obtain kinetic and thermodynamic parameters. The reaction paths during the explosion process were analyzed, and the reaction rates of elementary reactions were compared with different ratios of CH4/H2/air mixture. The key reactions at the initiation stage of CH4/H2/air mixture explosion were determined, and their configurations were optimized. The reaction mechanism, reaction channel and configuration parameters of key reactions were obtained, which was verified by the intrinsic reaction coordinate (IRC) theory. Results show that H2 addition increases the laminar burning velocity, while it shortens the ignition delay time of H2/CH4/air mixture. The addition of hydrogen greatly accelerated the explosion reaction from sample 1 to sample 4. Moreover, CH4 still plays a key role at the chain initiation stage in H2/CH4/air mixture system; the addition of H2 would not compete with CH4 for triggering the explosion reaction, nor will it suppress the explosion of CH4. H2 could not replace or take precedence over the chain branching reactant (CH2O) of CH4 explosion to react with O2. Besides, H2 takes precedence over CH4 in the process of chain transfer after the chain reaction beginning, although CH4 has a distinct advantage in the chain initiation stage. The present results can provide theoretical guidance for the prevention and control of gas explosion, which may effectively reduce the explosion hazards." @default.
• W3049400277 created "2020-08-21" @default.
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• W3049400277 date "2021-02-01" @default.
• W3049400277 modified "2023-10-18" @default.
• W3049400277 title "Chemical kinetic behaviors at the chain initiation stage of CH4/H2/air mixture" @default.
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• W3049400277 doi "https://doi.org/10.1016/j.jhazmat.2020.123680" @default.
• W3049400277 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33264879" @default.
• W3049400277 hasPublicationYear "2021" @default.
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