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Effects of ozone addition on the kinetics and efficiencies of methane conversion at fuel-rich conditions

Xie, Wenwen 1; Drost, Simon ORCID iD icon 1; Schießl, Robert 1; Maas, Ulrich 1
1 Institut für Technische Thermodynamik (ITT), Karlsruher Institut für Technologie (KIT)


Compression–expansion processes have the potential of converting mechanical work to chemical energy at fuel-rich conditions, allowing for the storage of fluctuating renewable energies. In this work, the conversion of methane and natural gas (NG) is investigated for this purpose. A focus is on using ozone as a reaction promoter for the otherwise slow reaction. The kinetics of fuel-rich methane/NG oxidation with ozone addition is investigated experimentally and numerically. To this end, ignition delay times (IDTs) for CH$_4$/O$_2$/O$_3$/Ar and NG/O$_2$/O$_3$/Ar mixtures are measured in a rapid compression machine (RCM). It is shown that a reaction mechanism obtained by simply combining a previously developed mechanism for methane conversion (PolyMech2.0) with an ozone sub-mechanism does not accurately predict IDTs. Sensitivity analyses identify reactions in the methane submechanism that become more important for ignition delay time when ozone is added in comparison to mixtures without O$_3$. The rate coefficients of these reactions are modified within their uncertainty ranges to better match the experimentally obtained IDTs. The resulting kinetic model, named PolyMech 3.0, predicts the IDTs obtained in RCM-experiments well. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000161499
Veröffentlicht am 23.08.2023
DOI: 10.1016/j.jaecs.2023.100157
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2023
Sprache Englisch
Identifikator ISSN: 2666-352X
KITopen-ID: 1000161499
Erschienen in Applications in Energy and Combustion Science
Verlag Elsevier B.V.
Band 15
Seiten Art.-Nr.: 100157
Vorab online veröffentlicht am 08.07.2023
Schlagwörter Ozone addition, Chemical kinetics, Polygeneration processes, Chemical energy storage, Rapid compression machine
Nachgewiesen in Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 3 – Gesundheit und WohlergehenZiel 7 – Bezahlbare und saubere Energie
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