Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 48, Issue 81, Pages 31790-31801Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2023.04.252
Keywords
Hydrogen; Flashback; Laminar premixed flame; Perforated burner; Decarbonization; Computational fluid dynamics
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This study investigates the flashback of different H2/CH4 mixtures and proposes a numerical model to predict the critical flashback velocity for laminar premixed flames.
Hydrogen has been identified as a potential tool for decarbonizing various industrial sec-tors by replacing natural gas while maintaining the combustion-based conversion system. However, due to its high reactivity, hydrogen is prone to flashback, making it essential to implement safety measures for its efficient use in practical appliances. This study in-vestigates the flashback of different H2/CH4 mixtures at an equivalence ratio 4 = 0.8 and proposes a numerical model to predict the critical flashback velocity for laminar premixed flames. The model considers the conjugate heat transfer between the gas phase and the burner plate. To overcome the computational cost needed to resolve both gas and burner heating, different time steps are employed for the fluid and the solid domains. Two flashback regimes are identified depending on the H2 content. The results suggest that using the laminar flame speed alone is inadequate for designing the safe operation of practical premixed burners.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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