수소/공기/희석제 혼합기의 점화지연과 화학반응 특성연구

• Published in: 한국안전학회지 Vol. 36; no. 3; pp. 1 - 6
• Main Authors: 이동열, Dong Youl Lee, 이의주, Eui Ju Lee
• Format: Journal Article
• Language: Korean
• Published: 한국안전학회 30.06.2021
• Subjects: diluent; hydrogen; ignition delay time; 안전공학; diluent; ignition delay time; hydrogen
• ISSN: 1738-3803; 2383-9953

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 N 2 and CO 2 were used to dilute the hydrogen/air mixture, the ignition delay time increased with increasing dilution ratios in both cases. The CO 2 -diluted mixtures exhibited a longer ignition delay than the N 2 -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.