Low Temperature Plasma Assisted Catalytic Reduction of NO x in Simulated Marine Diesel Exhaust
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Plasma Assisted Catalytic Reduction (PACR) of NO x has been investigated at laboratory scale for gas stream compositions representative of marine diesel exhausts. PACR NO x reduction in excess of 90% was measured at 350°C, a plasma specific energy of 60 J/l and two NO x concentrations (1,200 and 1,800 ppm). PACR NO x reduction of over 50% was measured for simulated marine engine conditions at 250°C, 60 J/l and 1,200 ppm NO x . The performance under these conditions could be increased, achieving a peak of ∼74% NO x reduction, although at a relatively high plasma power. Water, present in diesel exhaust, was shown to inhibit the poisoning effects of fuel sulphur using SO2 as a representative exhaust component. The PACR system performance demonstrated tolerance to simulated fuel sulphur levels of up to 1% for the duration of the tests. PACR performance was also shown to be sensitive to the amount of hydrocarbon reductant used.
KeywordsNOx Non-thermal plasma Catalyst Diesel exhaust
The authors would like to thank Wärtsilä Corporation for supporting the work through the European VIth Framework Integrated Project High Efficiency Engine R&D on Combustion with Ultra Low Emissions for Ships (HERCULES).
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