Measurement of the sulfur components in vehicle emissions is important in evaluating de-sulfating systems for the NOx after-treatments, such as a lean NOx trap catalyst, because sulfur poisoning on the surface would cause a serious decay of catalyst activity. Sulfur components analyzer is also necessary for the measurement of transient lubricant oil consumption, combined with gas flow measurement of engine exhaust. In this study a sulfur analyzer utilizing an ultraviolet fluorescent (UVF) detector has been developed to measure sulfur components in vehicle emissions. Generally, it is considered that an UVF detector cannot be used to measure sulfur components in vehicle emission due to a significant interference from NO in sample gases. In this study, an O3 injection technique has been developed to eliminate NO interference. Using this technique, the interference from NO has been reduced to less than 0.01 ppm with 3000 ppm NO. These results show a capability of utilizing UVF with this O3 injection technique to measure sulfur components in vehicle emissions including emissions with high concentrations of NO. An oxidation catalyst has also been evaluated to measure total reduced sulfur, TRS. Typical gas components in the vehicle emission except for NO have no influence on relaxation processes of exited SO2. NO has a little influence on these relaxation processes monitored by the UVF detector, but it was less than 3% (20ppb) of a reading of 0.68 ppm SO2 when exposed to 1596 ppm NO.
Development of a new UVF analyzer with O3 injection for measurement of SO(x) and TRS in vehicle emission
Entwicklung eines neuen UVF-Analysengeräts mit O3-Einspritzung für die Messung von SO(x) und TRS in der Abgasemission
2004
7 Seiten, 14 Bilder, 3 Tabellen, 4 Quellen
Conference paper
English
Automotive engineering | 2004
|SAE Technical Papers | 2004
|British Library Conference Proceedings | 2004
|Evaluation of an UV Analyzer for NOX Vehicle Emission Measurement
SAE Technical Papers | 2001
|Automotive engineering | 2004
|