Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Crossover Temperature and Ignition Delay Time of Diluted Hydrogen-Air Mixtures

희석된 수소-공기 혼합기의 크로스오버 온도와 점화지연시간

  • Dong Youl, Lee (Department of Safety Engineering, Pukyong National University) ;
  • Eui Ju, Lee (Department of Safety Engineering, Pukyong National University)
  • 이동열 (부경대학교 안전공학과) ;
  • 이의주 (부경대학교 안전공학과 )
  • Received : 2022.08.16
  • Accepted : 2022.10.21
  • Published : 2022.12.31
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Abstract

Hydrogen is a clean fuel and is used in many applications in power systems such as fuel cells. It has unique properties such as wide flammability, high burning velocity, and difficulty to liquefy, which lead to critical safety issues. Fire and explosion are the most frequently occurring accidents and one of the major reasons is autoignition. In the ignition process, the chemistry of hydrogen combustion depends mainly on radical pools, and the temperature at which chain-branching and terminating rates are equal is called the crossover temperature. This study addresses the homogeneous autoignition of diluted hydrogen-air mixtures to investigate the effects of dilution on the crossover temperature to prevent explosions in the future. The new criterion for crossover temperature is introduced by only hydrogen radicals to adjust more simply. The detailed calculations indicate that the crossover temperatures are low at high dilutions of carbon dioxide and nitrogen because the concentrations of active radicals are reduced when an inert gas is added. This result is expected to contribute to hydrogen safety and realize a hydrogen society in the future.

Keywords

Acknowledgement

This work was supported by a Research Grant of Pukyong National University(2021).

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