Title: Theoretical Physics-based Definition and Accurate Characterization of Lower Concentration Limit for Hydrogen-Air Mixtures // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 2: 21-26 April 2019, Saint Petersburg, Russia
Creators: Kirillov I. A.
Organization: National Research Centre "Kurchatov Institute"
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
DOI: 10.18720/SPBPU/2/k19-115
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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Understanding of nature and knowledge of the specific numerical values of the concentration limits for explosions in hydrogen-containing mixtures is important for existing nuclear power plants, future thermonuclear installations, multiple industrial applications in petrochemical and chemical industry, coming generation of the hydrogen-fueled vehicles and hydrogen energy infrastructure. In this paper a theoretical physics-based definition for the concentration limits of hydrogen-air gas explosions. Gas explosions have been and are attributed to the self-spreading frontal deflagration flames, whose evolution through flammable gas cloud after ignition results in the substantial baric effects. Specifically in the hydrogen-air mixtures within flammability limits two generic flames can propagate – self-propagating frontal deflagration flames (described by Zeldovich-Frank-Kamenetskii model) and confined in space the buoyant flame-balls (aka Zeldovich model). Fundamental concentration limit difference between these two generic types of flames could be regarded as a critical value for severity of hydrogen-air explosions. Within a Deflagration-to-Flame Ball Transition (DFBT) concentration range (7-12 vol% H2) three traceable candidates exist – two empirical and one theoretical concentration limits. Relations between these candidates and their specific physico-chemical features are described. Targets for three future studies are proposed – one for direct (empirical or computational) evidence in support of a fundamental character of concentration limits under consideration and two studies for accurate quantitative characterization of the ultimate lower concentration limit for hydrogen-air explosions.

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