Assessment of NOx Destruction in Diesel Engines by Injecting NO in the Intake Manifold

Vellaisamy, Ramprabhu; Clark, Nigel N.; Thompson, Gregory; Atkinson, Richard J.; Tissera, Chamila A.; Swartz, Matt M.

doi:10.4271/2005-01-0370

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…These researchers achieved a cost The SNR process, developed in 1998 by Krutzsch et al [2,3] for diesel and gasoline engines, found similar trends for NO X conversion. In 2005, Vellaisamy et al [26,27], confirmed these conversion properties in a 1992 DDC series 60 diesel engine, with detailed effects of the SNR process on PM and other regulated emissions. These researchers achieved NO X conversion rates exceeding 50% in turbocharged diesel engines operated with direct fuel injection.…”

Section: Literature Reviewmentioning

confidence: 90%

“…The time frame for this percentage of CH 4 to be consumed varies with temperature, as can be seen inFigures 23, 25, 27, and 29 for the varying mixtures of gases. This time was then used to find the mole fraction of NO X , shown inFigures 24,26,28, and 30, in the mixture at that time, which then gave the NO X conversion.The percent CH 4 method was chosen when evaluating EGR and stoichiometric characteristics. Since the in cylinder pressure is not yet measured, the time frame in which reactions are actually occurring is not yet known.…”

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confidence: 99%

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Nitric oxide conversion in a spark-ignited natural gas engine

Swartz¹

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Reducing NO X emissions from natural gas engines has become increasingly important from an environmental standpoint. A large percentage of stationary engine applications are natural gas fueled. The cleanest of these large bore engines currently produce on the order of one gram of NO X per brake-horsepower hour (g/bhp-hr) of work done. The goal of this work is to reduce these emissions to 0.1 g/bhp-hr levels. Selective NO X Recirculation (SNR), a technology which will help achieve these 0.1 g/bhp-hr levels, is currently being studied at West Virginia University. SNR has been proven in gasoline and diesel engines, with up to 90% NO X conversion rates being achieved, but not much is I would also like to extend my gratitude to Dr. Gregory Thompson for his knowledge of the laboratory equipment, and Tom Spencer for his knowledge and humor. I thank Chamila, Emre, and Ram for their friendship and skills at the fooseball table, and also for their help with this research. I would also like to thank my brother and best man Craig for his interesting conversation, and my parents for their advice.

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Section: Literature Reviewmentioning

confidence: 90%

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confidence: 99%

Nitric oxide conversion in a spark-ignited natural gas engine

Swartz¹

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“…[43]. For information on the testing facility and the equipment used, see reference [44,45]. The test vessel is first discussed followed by the data logger setup.…”

Section: Diesel Particulate Filters (Dpf)mentioning

confidence: 99%

“…The onboard marine measurement system explained in Section 3.7 was validated by performing steady state comparison testing to the EERL CVS system. For more information on EERL, see references [44,45]. The system was tested on a 1992 Detroit Diesel, series 60 diesel engine.…”

Section: Onboard System Validationmentioning

confidence: 99%

Staten Island Ferry emissions reduction

Nuszkowski¹

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Staten Island Ferry Emissions Reduction John Nuszkowski Marine diesel engines are being investigated thoroughly since many engines in these vessels incorporate older technology that may not have been subjected to emissions regulations and hence produce a significant amount of pollution. The Staten Island Ferry Alice Austen was fitted with selective catalytic reduction (SCR) technology to reduce the emissions of oxides of nitrogen (NOx) to offset the dredging equipment emissions from the Harbor Deepening project. Data logging showed a repeatable route of vessel operation including an idle, acceleration, cruise, and maneuvering mode combined with vessel direction. The SCR system provided 34-64% NOx reduction for a round trip with less than 8ppm ammonia slip. Average NOx reductions during cruise mode were 47-75%. Reductions for the cruise mode during urea injection typically exceeded 94%. From modal analysis of onboard testing, idle, acceleration, and maneuvering produced 20% of the NOx. Cruise produced 80% of the NOx. The oxidation catalyst provided 80-95% reduction in carbon monoxide.

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“…PM is measured in real time and as a total at the end of each test run. See references for more information on the WVU CAFEE laboratory and engine test set-up[72,73].…”

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confidence: 99%

Investigation of techniques and effects of diesel particulate filter cleaning

Moles¹

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Investigation of Techniques and Effects of Diesel Particulate Filter Cleaning Nathaniel Moles As the emissions standards placed on diesel engine exhaust become more stringent, the use of exhaust aftertreatment devices such as diesel particulate filters has become a more attractive means to meet those standards. During the use of these filters some of the particulate captured, usually ash, begins to restrict the flow through the filter. This increases the backpressure in the exhaust system and requires routine cleaning maintenance. This study reviewed engine technology used to reduce particulate emissions and investigated the effects of off-line cleaning of diesel particulate filters using compressed air and water flowing in the reverse direction of the exhaust flow. The resulting effects of these cleaning procedures were examined by measuring the weight lost and the pressure drop across the filters at varying air flow rates. Both the differential pressure and weight loss indicated that most of the particulate was removed during the initial stages of compressed air cleaning. A maximum of 92% of the total filter weight was removed from a single filter with a maximum decrease of 65% of the differential pressure across the filter. Flowing water in the reverse direction was found to be one of the most effective options in cleaning these filters, but many filters have matting materials that are damaged when exposed to water. Compressed air blown in the reverse direction for a thirty minute time period is recommended with a subsequent twenty minute water cleaning, if water is not restricted by the manufacturer.

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Assessment of NOx Destruction in Diesel Engines by Injecting NO in the Intake Manifold

Cited by 7 publications

References 12 publications

Nitric oxide conversion in a spark-ignited natural gas engine

Nitric oxide conversion in a spark-ignited natural gas engine

Staten Island Ferry emissions reduction

Investigation of techniques and effects of diesel particulate filter cleaning

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