Naslov
Numerical investigation of wall film formation for SCR applications

Autori
Baleta, Jakov ; Vujanović, Milan ; Pachler, Klaus ; Reinhard, Tatschl

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, pp prezentacija, znanstveni

Izvornik
17th ERCOFTAC (European Research Community on Flow, Turbulence and Combustion) Alpe Danube Adria Pilot-Center Meeting, 2013. / - , 2013

Skup
17th ERCOFTAC Alpe Danube Adria Pilot-Center Meeting,

Mjesto i datum
Graz, Austrija, 03.05.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
gas aftertreatment; selective catalytic reduction; wallfilm; urea water solution; NOx reduction; computational fluid dynamics

Sažetak
Engine-related measures, such as exhaust gas recirculation, are not sufficient for the fulfillment of the legally prescribed limits for NOx any more, especially for diesel vehicles. The urea-water-solution (UWS) based selective catalytic reduction (SCR) is most promising method to control NOx emissions from diesel engines. Once urea-water-solution spray is injected into hot exhaust gas stream before SCR catalyst, water content evaporates from UWS. Afterwards, ammonia is generated through thermal decomposition of urea and hydrolysis of isocyanic acid. Generated ammonia takes part in various deNOx reactions as a reductant. The resulting spatial distribution of the reducing agent upstream to the catalyst is a crucial factor for the conversion of NOx. The uniform distribution and the degree of processing of the reducing agent upstream of the SCR catalyst, besides the evaporation and decomposition, can also be influenced by the spray/wall interaction.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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