On-Road Demonstration of NOx Emission Control for Diesel Trucks with SINOx Urea SCR System

Fritz, Nicole; Mathes, W; Zuerbig, Juergen; Mueller, Raimund

doi:10.4271/1999-01-0111

Cited by 43 publications

(17 citation statements)

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“…21,23,28 The CO emissions, although low, increased by a factor of 1.4 -2 downstream of the SCR (Figure 3, a and c). Other studies have shown increases 28,48 and decreases in CO emissions. 48,53 Several researchers have reported a reduction in hydrocarbons and carbonaceous PM matter (EC and OC) across the SCR catalyst.…”

Section: Scrmentioning

confidence: 98%

“…Other studies have shown increases 28,48 and decreases in CO emissions. 48,53 Several researchers have reported a reduction in hydrocarbons and carbonaceous PM matter (EC and OC) across the SCR catalyst. 21,28,47,48,54,55 The SCR on AE1 reduced OC by as much as 77-91%, whereas the EC fraction reduced by 17-63% (Figure 3, b and d).…”

Section: Scrmentioning

confidence: 98%

“…48,53 Several researchers have reported a reduction in hydrocarbons and carbonaceous PM matter (EC and OC) across the SCR catalyst. 21,28,47,48,54,55 The SCR on AE1 reduced OC by as much as 77-91%, whereas the EC fraction reduced by 17-63% (Figure 3, b and d). The ratio of OC to EC reduces from 8:1 to 22:1 to 1:1 to 8:1 across the SCR.…”

Section: Scrmentioning

confidence: 99%

“…The SCR system used urea injection and a vanadium catalyst impregnated on a titanium oxide bed. 47,48 No diesel oxidation catalyst (DOC) was installed downstream of the catalyst because of lack of space. The urea injection rate was adjusted by the SCR control system on the basis of the exhaust gas temperature before the SCR and the concentration of NO x after it.…”

Section: Emission Control Technologiesmentioning

confidence: 99%

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Effectiveness of Emission Control Technologies for Auxiliary Engines on Ocean-Going Vessels

Jayaram

Nigam

Welch

et al. 2011

Journal of the Air & Waste Management Association

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Large auxiliary engines operated on ocean-going vessels in transit and at berth impact the air quality of populated areas near ports. This paper presents new information on the comparison of emission ranges from three similar engines and the effectiveness of three control technologies: switching to cleaner burning fuels, operating in the low oxides of nitrogen (NO x ) mode, and selective catalytic reduction (SCR). In-use measurements of gaseous (NO x , carbon monoxide [CO], carbon dioxide [CO 2 ]) and fine particulate matter (PM 2.5 ; total and speciated) emissions were made on three auxiliary engines on post-PanaMax class container vessels following the International Organization for Standardization-8178-1 protocol. The in-use NO x emissions for the MAN B&W 7L32/40 engine family vary from 15 to 21.1 g/kW-hr for heavy fuel oil and 8.9 to 19.6 g/kW-hr for marine distillate oil. Use of cleaner burning fuels resulted in NO x reductions ranging from 7 to 41% across different engines and a PM 2.5 reduction of up to 83%. The NO x reductions are a consequence of fuel nitrogen content and engine operation; the PM 2.5 reduction is attributed to the large reductions in the hydrated sulfate and organic carbon (OC) fractions. As expected, operating in the low-NO x mode reduced NO x emissions by approximately 32% and nearly doubled elemental carbon (EC) emissions. However, PM 2.5 emission factors were nearly unchanged because the EC emission factor is only approximately 5% of the total PM 2.5 mass. SCR reduced the NO x emission factor to less than 2.4 g/kW-hr, but it increased the PM 2.5 emissions by a factor of 1.5-3.8. This increase was a direct consequence of the conversion of sulfur dioxide to sulfate emissions on the SCR catalyst. The EC and OC fractions of PM 2.5 reduced across the SCR unit. INTRODUCTIONRecent research has shown that ship emissions are a significant contribution to the global emission inventory 1-8 and impact local and regional air quality in highly populated areas located near ports. 9 -13 Particulate matter (PM) emissions from ships have been linked to increased cardiopulmonary and lung cancer deaths across the world, most of which occur near the coastline. 14 All of these studies indicate that the forecasted increase in port activity and growth of ports will result in greater emissions from ships near coastlines and potentially a more adverse health impact for the communities located near them. Therefore, several emission control technologies are being investigated for marine engines.Ships, the largest source of port emissions, 15 generally have one main propulsion engine and three to seven auxiliary engines (AEs). AEs, typically medium-speed four-stroke marine diesel engines, are operated near/at the port to provide power for cargo refrigeration, hotelling, maneuvering, etc. Hence, AEs can have a significant impact on air quality near the ports.

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Section: Scrmentioning

confidence: 98%

Section: Scrmentioning

confidence: 98%

Section: Scrmentioning

confidence: 99%

Section: Emission Control Technologiesmentioning

confidence: 99%

See 2 more Smart Citations

Effectiveness of Emission Control Technologies for Auxiliary Engines on Ocean-Going Vessels

Jayaram

Nigam

Welch

et al. 2011

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

show abstract

“…This development In Europe has led to teshng of the system ~n Germany, with promising findings Siemens-Westinghouse has performed laboratory and fleet testing of SlNOx Systems on approxtrrately 20 European Dalmler-Chrysler (Mercedes Benz) and MAN heavy-duty Class 8 vehicles The following reductions were measured In transient testing (FIGE Transient Test Cycle) in Europe NO, 82%, 77%, and PM 18% (6). In addition to the large emissions reduction, the test results suggest that the SINOx System wdl have no effect on fuel economy The SfNOx System is expected to be commercially available on DaJmler-Chrysler ~nd MAN heavy-duty trucks for the model year 2000.…”

Section: Introductionmentioning

confidence: 99%