Role of Surface Reactions in Hydrogen–Oxygen Explosion Limits

Abstract

In this paper, the role of surface reactions in the explosion limits of hydrogen−oxygen mixtures was investigated, which was found to substantially affect the limits. Specifically, we compared situations with and without surface reactions by considering various sticking coefficients, with the temperature exponents of the radicals varying simultaneously and individually, site density of surface and no surface reactions, dilutions of four gases, equivalence ratio of H 2 and O 2 , reactor size (sphere radii), and residence time. The specific roles of these factors were identified, demonstrating that the existence of surface reactions can substantially modify the explosion limits and that the simulation can accurately predict the experimental data from both the closed vessel and flow reactor by accounting for the surface reactions.

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

“…Experimental verification is required on various aspects of hydrogen gas mixtures, such as under what conditions are such mixtures the most harmful. Research on syngas can prevent the unknown hazards caused by syngas and enable energy development. , Most existing research on hydrogen gas mixtures has focused on extremely idealized conditions, with uniformly mixed gas being used for testing. However, the densities of various gases are different; thus, the gas distribution in space is often uneven, and the gas distribution under different standing times is different.…”