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- Title
A Heated AdBlue/DEF Mixer for High Efficiency NOx Reduction in Low Temperature Drive Cycles, RDE and City Driving.
- Authors
Masoudi, M.; Poliakov, N.; Noorfeshan, S.; Hensel, J.; Tegeler, E.
- Abstract
An electrically heated mixer (EHM™) has been developed. It enables injecting urea-water solution in low temperature Diesel exhaust operations, such as in low-load cycles, real-driving-emissions (RDE), stop-and-go, city driving and local delivery cycles, enabling high efficiency (SCR) selective catalytic reduction of NOx in challenging operations. In low temperature exhaust, EHM frees the injected droplets from relying on the heat of the exhaust. It provides thermal energy to swiftly heat and evaporate the droplets, accelerating their thermolysis and hydrolysis reactions. Designed to be compact, low cost and robust, EHM forms plenty of reductants (ammonia, isocyanic acid) while mitigating the deposit risks. It has been tested on an engine in highly transient, low-load cycles exhibiting robust SCR of NOx well below 200 °C in long cycles with urea injection starting in as low as 130 °C. The mixer has been evaluated on a light duty Diesel engine using a purged (no-ammonia-stored) SCR catalyst simulating extended stop-and-go operations, demonstrating 99–100% NOx reduction efficiency during "stops" (idling) at 180 °C, and 80 to 95% during fast transients at 160 °C, while inhibiting deposit formation. These results were achieved without any engine or system calibration. EHM needs less than 200 W to operate on a light duty Diesel engine, and about 500 W on a heavy-duty engine. Given its thermal energy, it can be also used during cold-starts or cold-cycles for rapid-heatup of the SCR catalyst(s). EHM can also enable high engine-out NOx strategy so for fuel economy and reduced CO2.
- Subjects
LOW temperatures; ISOCYANIC acid; DIESEL motors; ENGINE testing; ELECTRIC vehicle batteries; CATALYTIC reduction; THERMOLYSIS; AUTOMOBILE driving; WATER bikes
- Publication
Topics in Catalysis, 2023, Vol 66, Issue 13/14, p771
- ISSN
1022-5528
- Publication type
Article
- DOI
10.1007/s11244-022-01714-2