External and internal ignition of a hydrogen-air gas mixture induced by a recombiner

External and internal ignition of a hydrogen-air gas mixture induced by a recombiner

During their initial development, passive autocatalytic hydrogen recombiners (PARs) were presumed to operate in a flameless mode. However, a series of independent experiments conducted in the 1990s observed hydrogen-air gas mixtures igniting as a result of PAR operation. This ignition was due to ove...

Full description

Saved in:
Bibliographic Details
Published in:Atomic energy (New York, N.Y.) Vol. 135; no. 1-2; pp. 97 - 106
Main Authors: Bezgodov, E. V., Pasyukov, S. D, Nikiforov, M. V., Tarakanov, A. A., Popov, I. A., Moshkin, DL, Davletchin, U. F., Simonenko, V. A., Kirillov, I. A., Kalyakin, S. G., Sedov, M. K.
Format: Journal Article
Language:English
Published: New York Springer US 01-11-2023
Springer
Springer Nature B.V
Subjects:
Catalysts
Gas mixtures
Gas streams
Hadrons
Heavy Ions
Hydrogen
Ignition
Nuclear accidents & safety
Nuclear Chemistry
Nuclear Energy
Nuclear Physics
Nuclear power plants
Nuclear safety
Overheating
Physics
Physics and Astronomy
Substrates
621.039.587+621.45.018.2
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:During their initial development, passive autocatalytic hydrogen recombiners (PARs) were presumed to operate in a flameless mode. However, a series of independent experiments conducted in the 1990s observed hydrogen-air gas mixtures igniting as a result of PAR operation. This ignition was due to overheating of the catalyst, leading to the thermal ignition of hydrogen-air mixtures (termed “internal ignition”). Additionally, individual particles may become detached from the catalyst substrate and swept up by the gas stream to subsequently ignite the gas mixture outside the recombiner housing, a phenomenon known as “external ignition.” This article delves into the experimental findings concerning two mechanisms of hydrogen-air mixture ignition. Direct evidence for recombiner-induced external ignition was captured using the Schlieren method. It was confirmed that the concentration limits for external ignition differ from those for internal ignition. In order to ensure nuclear power plant safety, the development of a testing methodology for the technology used in manufacturing catalysts is essential.
ISSN:1063-4258
1573-8205
DOI:10.1007/s10512-024-01087-7