Characteristics of Chemical Reaction and Ignition Delay in Hydrogen/Air/Diluent Mixtures 


Vol. 36,  No. 3, pp. 1-6, Jun.  2021
10.14346/JKOSOS.2021.36.3.1


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  Abstract

Hydrogen is considered a cleaner energy source than fossil fuels. As a result, the use of hydrogen in daily life and economic industries is expected to increase. However, the use of hydrogen energy is currently limited because of safety issues. The rate of combustion of the hydrogen mixture is about seven times higher than that of hydrocarbon fuels. The hydrogen mixture is highly flammable and has a low minimum ignition energy. Therefore, it presents considerable risks for fire and explosions in all areas of hydrogen manufacturing, transportation, storage, and use. In this study, the auto-ignition characteristics of hydrogen were investigated numerically for diluted hydrogen mixtures. Auto-ignition temperature, a critical property predicting the fire and explosion risk in hydrogen combustion, was determined in well-stirred reactors. When N2 and CO2 were used to dilute the hydrogen/air mixture, the ignition delay time increased with increasing dilution ratios in both cases. The CO2-diluted mixtures exhibited a longer ignition delay than the N2-diluted mixtures. We also confirmed that lower initial ignition temperatures increased the ignition delay times at 950 K and above. Overall, the auto-ignition characteristics, such as the concentrations of participating species and ignition delay times, were primarily affected by the initial temperature of the mixture.

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  Cite this article

[IEEE Style]

이동열 and 이의주, "Characteristics of Chemical Reaction and Ignition Delay in Hydrogen/Air/Diluent Mixtures," Journal of the Korean Society of Safety, vol. 36, no. 3, pp. 1-6, 2021. DOI: 10.14346/JKOSOS.2021.36.3.1.

[ACM Style]

이동열 and 이의주. 2021. Characteristics of Chemical Reaction and Ignition Delay in Hydrogen/Air/Diluent Mixtures. Journal of the Korean Society of Safety, 36, 3, (2021), 1-6. DOI: 10.14346/JKOSOS.2021.36.3.1.

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