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Modeling the Effect of Nonuniformities from Urea Injection on SCR Performance Using CFD
Published in American Chemical Society
2019
Volume: 58
   
Issue: 44
Pages: 20247 - 20258
Abstract
A computational fluid dynamics model, consisting of a mixing chamber coupled with a catalytic converter, is developed for the selective catalytic reduction (SCR) of NOx using urea. The NH3 required for the SCR reactions is produced from the injection and decomposition of urea in the mixing chamber. The conversion efficiency and concentration distribution of NH3 from the mixing chamber are analyzed for a range of operating conditions. The flow and species distribution profiles from the mixing chamber are incorporated as inlet boundary conditions at the entrance of the downstream SCR convertor. The SCR convertor comprises a central catalytic monolith and inlet and outlet diffuser sections. Variations in NOx concentration were observed within the monolith due to heat losses and nonuniformities in ammonia concentrations. While heat effects under non-isothermal conditions slightly improved the NOx conversion efficiency, nonuniformities in ammonia concentrations did not significantly influence the SCR performance. Thus, the radial variations in NH3 concentrations, owing to nonuniformity at the outlet of the mixing chamber, did not considerably impact the overall performance of the SCR. The effects of temperature, NO:NO2 ratio, and inlet velocity were investigated. Copyright © 2019 American Chemical Society.
About the journal
JournalData powered by TypesetIndustrial and Engineering Chemistry Research
PublisherData powered by TypesetAmerican Chemical Society
ISSN08885885
Open AccessNo
Concepts (17)
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    Ammonia
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    Computational fluid dynamics
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    Conversion efficiency
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    Efficiency
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    Metabolism
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    Mixing
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    Nitrogen oxides
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    Urea
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    AMMONIA CONCENTRATIONS
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    Computational fluid dynamics modeling
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    Concentration distributions
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    Effects of temperature
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    Non-isothermal condition
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    Operating condition
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    SELECTIVE CATALYTIC REDUCTION OF NOX
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    Species distributions
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    Selective catalytic reduction