Numerical evaluation of direct injection of urea as NOx reduction method for heavy duty diesel engines
Journal article, 2007

The effect of ammoniac deoxidizing agent (Urea) on the reduction of NO x produced in the Diesel engine was investigated numerically. Urea desolved in water was directly injected into the engine cylinder during the expansion stroke. The NOx deoxidizing process was described using a simplified chemical kinetic model coupled with the comprehensive kinetics of Diesel oil surrogate combustion. If the technology of DWI (Direct Water Injection) with the later injection timing is supposed to be used, the deoxidizing reactants could be delivered in a controlled amount directly into the flame plume zones, where NOx are forming. Numerical simulations for the Isotta Fraschini DI Diesel engine are carried out using the KIVA-3V code, modified to account for the "co-fuel" injection and reaction with combustion products. The results showed that the amount of NOx could be substantially reduced up to 80% with the injection timing and the fraction of Urea in the solution optimized. Copyright © 2007 SAE International.

Author

Valeri Golovitchev

Chalmers, Applied Mechanics, Combustion

Luca Montorsi

Chalmers, Applied Mechanics, Combustion

Ingemar Denbratt

Chalmers, Applied Mechanics, Combustion

Felice E. Corcione

Istituto Motori

Salvatore Coppola

Isotta Fraschini Motori S.p.A

SAE Technical Papers

0148-7191 (ISSN)

Subject Categories

Other Mechanical Engineering

Energy Engineering

Chemical Process Engineering

DOI

10.4271/2007-01-0909

More information

Latest update

3/31/2020