Combined DPF+SCR systems for retrofitting in the VERT quality verification tests

• Autorzy: Czerwinski J. , Zimmerli Y. , Mayer A. , Bunge R. , Heeb N. , Lemaire J. , Jauss F.
• Języki publikacji: EN

Abstrakty

EN

New Diesel exhaust gas aftertreatment systems, with DPF*) and deNOx (mostly SCR) inline application are very important step towards zero emission Diesel fleet. Solid quality standards of those quite complex systems are urgently necessary to enable decisions by several authorities. The Swiss Federal Office of the Environment BAFU and the Swiss Federal Roads Office ASTRA decided to support further activities of VERT to develop appropriate testing procedures and to define the quality criteria. The present report informs about the international network project VERT *) dePN (de-activation, de-contamination, disposal of particles & NOx), which was started in Nov. 2006 with the objective to introduce the SCR-, or (DPF+SCR)-systems in the VERT verification procedure. Examples of results with some investigated systems are given. The most important statements are: - the investigated combined aftertreatment systems (DPF+SCR) for dynamic engine application efficiently reduce the target emissions with deNOx-efficiency up to 92% (if operated in the right temperature window) and filtration efficiency based on particle count up to 100%, - the average NOx conversion rate at transient operation (ETC) depends strongly on the exhaust gas temperature profile and the resulting urea dosing control, - the NP filtration efficiency, which is verified at stationary engine operation is perfectly valid also at the transient operation. The present results will be confirmed in the further project activities with other systems and with different testing cycles. A special attention will be paid to the operational profiles, which are representative for low emissions zones LEZ.

Słowa kluczowe

EN

diesel emission reduction; diesel particle filter; SCR; limited and unlimited emissions; deNOx

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2008
• Tom: Vol. 15, No. 3
• Strony: 89--101
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Czerwinski J.

autor

Zimmerli Y.

autor

Mayer A.

autor

Bunge R.

autor

Heeb N.

autor

Lemaire J.

autor

Jauss F.

• University of Applied Sciences, Biel-Bienne, Switzerland (AFHB)

Bibliografia

• [1] Frank, W., Hüthwohl, G. Maurer, B., SCR-Technologie für Nutzfahrzeuge, Purem Abgassysteme,GmbH, MTZ 9/2004, pp. 632.
• [2] Jacob, E., Ammonia Generators for GD-KAT (advanced SCR) Systems, MAN, 2. Emission Control 2004, TU Dresden 17/18 pp. 358, Juni 2004.
• [3] Görsmann, C., Retrofit SCRT® - A retrofit system for the simultaneous reduction of carbon monoxide, hydrocarbon, soot particulate and oxides of nitrogen emissions from commercial vehicles, 4, FAD - Konferenz, Dresden, pp. 155, Nov. 2006.
• [4] www.lowemissionzones.eu
• [5] Xu, L., Watkins, W., Snow, R., Graham, G., McCabe, R., Lambert, Ch., Carter III, R. O., Laboratory and Engine Study of Urea-Related Deposits in Diesel Urea-SCR After-Treatment Systems. SAE Techn., Paper 2007-01-1582, 2007.
• [6] Girard, J., Snow, R., Cavataio, G., Lambert, Ch., The Influence of Ammonia to NOx Ratio on SCR Performance, SAE Techn. Paper 2007-01-1581, 2007.
• [7] Hoard, J., Snow, R., Xu, L., Gierczak, Ch., Hammerle, R., Montreuil, C., Farooq, S. I., Nox Measurement Errors in Ammonia-Containing Exhaust, SAE Techn. Paper 2007-01-0330,2007 .