Characteristics of Explosion Hazards in Methane–Air Mixtures Diluted by Hydrogen

Jiajia Liu, Danyang Yu, Ping Li (), Xuxu Sun () and Xianfeng Chen
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Jiajia Liu: School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China
Danyang Yu: School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China
Ping Li: School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China
Xuxu Sun: School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China
Xianfeng Chen: School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China

Energies, 2023, vol. 16, issue 18, 1-14

Abstract: The combustion efficiency of methane can be effectively enhanced with the occurrence of hydrogen. However, the combustion characteristic of premixed methane/hydrogen/air is not fully understood. In this study, the effect of the amount of hydrogen addition on the explosion risk of premixed CH 4 /air combustion was fully investigated through experiments and simulations. The explosion overpressure of premixed CH 4 /air combustion with various hydrogen additions was measured in a standard 20 L spherical closed vessel. Meanwhile, the microscopic flame structures for the same cases were simulated using 2022 Chemkin-Pro software. The results showed that hydrogen could increase the explosion risks of premixed CH 4 /air combustion. The rate of key elementary reactions R38: H + O 2 <=> O + OH and R84: OH + H 2 <=> H + H 2 O in the system could be accelerated by hydrogen. The peak explosion overpressure in the closed chamber is boosted and the arrival time of peak overpressure rise rate is shortened, which raises the danger. Especially under lean and rich combustion conditions, hydrogen could potentially lead to more dangerous situations. With the increase in hydrogen concentration, the reaction rate of key elementary reactions accelerates faster, the peak explosion overpressure increases more, and the peak overpressure rise rate arrives earlier.

Keywords: hythane; explosive hazards; overpressure; laminar burning velocity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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