Simulation of Urea-SCR Process Applied to Lean-burn SI Engines
Document Number: 2009-01-2776
Date Published: November 2009
Author(s):
Stephane Zinola - IFP
Jean Charles Dabadie - IFP
Stephane Raux - IFP
Abstract:
Lean-burn combustion in SI engines can significantly reduce fuel consumption but NOx reduction becomes challenging because classic three-way catalyst (TWC) is no more efficient. Urea-SCR is then an interesting alternative solution because of its high NOx conversion efficiency without any additional fuel consumption. The coupling between two SI lean-burn engines (stratified and homogeneous combustion) and a urea-SCR catalyst was simulated on the NEDC cycle. Simulation results showed that the SCR efficiency would comply with the limits required by future Euro 5/6 regulations. Associated urea solution consumptions were estimated thanks to a simplified model. Finally, a comparison with a diesel application was also made. It showed that the required amount of reducing agent remained significantly higher for SI lean-burn engines than for diesel engine.
File Size: 468K
Product Status: In Stock
See other papers presented at SAE 2009 Powertrains Fuels and Lubricants Meeting, November 2009, San Antonio, TX, USA, Session: Exhaust System Modeling
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