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Dispersion aspects of NH3-delivery strategies for NH3-based SCR systems

Andreas Lundström (Kompetenscentrum katalys (KCK)) ; Henrik Ström (Institutionen för tillämpad mekanik, Strömningslära ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Kompetenscentrum katalys (KCK) ; Institutionen för kemi- och bioteknik, Teknisk ytkemi)
Topics in Catalysis (1022-5528). Vol. 56 (2013), 1, p. 75-79.
[Artikel, refereegranskad vetenskaplig]

The current work investigates the performance of an NH3-based SCR-system for two different NH3-delivery strategies, based on either urea or gaseous ammonia, using computational fluid dynamics (CFD). Quantification of the radial uniformity of NH3 shows that the system based on gaseous ammonia is capable of providing a more even NH3-profile. It is also shown that the uniformity obtainable in a urea-SCR system may be substantially enhanced by the introduction of a static mixer. Furthermore, the results indicate that the expected negative influence on the radial uniformity of a gas-based system from a decreased retention time before the catalyst is counterbalanced by an increased radial mixing. In addition, two theoretically derived "rule of thumb"-relations for estimating the performance of SCR systems are presented and their use in the interpretation of the CFD data is illustrated.

Nyckelord: selective catalytic reduction (SCR), computational fluid dynamics (CFD), urea-SCR, NH3-SCR

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Denna post skapades 2012-12-03. Senast ändrad 2015-05-06.
CPL Pubid: 167010


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