Abstract
A marine SCR (Selective Catalytic Reduction) system will be needed as an exhaust gas aftertreatment to reduce NOx emissions from a marine Diesel engine. The SCR system is used in a transient engine load condition which has changing concentrations of NOx and exhaust gas quantities. In transient conditions, the amount of injected reducing agent should be controlled to prevent unreacted-NH3, which is called slipped NH3. However, it is difficult to estimate slipped NH3 using the first-order reaction rate constant of NOx reduction. To estimate slipped NH3 in detail, adsorption-desorption of NH3 to a catalyst and SCR reaction rate should be considered. In this paper, NOx reduction performance and slipped NH3 are evaluated with one-dimensional SCR simulation using the kinetic parameters of catalytic reaction. As a result, it is confirmed that one-dimensional SCR simulation can effectively simulate the actual SCR system, and thus it can evaluate NOx reduction performance and slipped NH3 by considering the amount of reducing agent.
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