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REDIM based model reduction of the decomposition of urea-water-solutions in films and droplets

Berszany, Etele 1; Stein, Marcus 1; Bykov, Viatcheslav ORCID iD icon 1; Maas, Ulrich 1
1 Institut für Technische Thermodynamik (ITT), Karlsruher Institut für Technologie (KIT)

Abstract:

Selective catalytic reduction (SCR) process with urea-water solution (UWS) is often used in automotive industry to decrease emissions of nitric oxides (NO x) in the exhaust gas. In this process the urea from UWS decomposes to isocyanic acid and ammonia, where the latter is needed to increase the efficiency of the NO xreduction on the catalyst surface. Along with the advantages of using UWS several drawbacks reduce the performance of a SCR system. Incomplete decomposition of urea leads to a formation of residuals affecting the efficiency of the exhaust gas systems. Therefore, the complete decomposition of urea and homogeneous distribution of the resulting ammonia in front of the SCR catalyst represent main challenges in improving the SCR technology. In order to investigate the process of the urea decomposition a detailed chemical kinetic mechanism in the liquid phase is employed. The results are compared with a commonly used approach to model urea decomposition as an evaporation with a following decomposition reaction in the gas phase. It is shown that by using such a mechanism, the decomposition of urea and the gas phase composition with the urea decomposition products can be described more accurately. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000155905
Veröffentlicht am 15.02.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 24.11.2022
Sprache Englisch
Identifikator ISBN: 9788412322286
ISSN: 2696-6999
KITopen-ID: 1000155905
Erschienen in ECCOMAS Congress 2022 - 8th European Congress on Computational Methods in Applied Sciences and Engineering
Veranstaltung 8th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2022), Oslo, Norwegen, 05.06.2022 – 09.06.2022
Verlag International Centre for Numerical Methods in Engineering (CIMNE)
Serie WCCM-ECCOMAS Congress
Schlagwörter Exhaust gas system, urea-water-solution, urea decomposition, model reduction, REDIM
Nachgewiesen in Scopus
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 9 – Industrie, Innovation und Infrastruktur
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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