AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Emissions of NOx, NO, NH3, N2O and BC from a Diesel Engine Equipped with an SCR System Fueled with Diesel and Biodiesel: Dispersion Analysis and Pollutant Risk Assessment in Curitiba, Brazil
RICARDO H. M. GODOI, Yara S. Tadano, Guillherme C. Borillo, Thiago O. B. Silva, Amanda Cichon, Fabio B. Valebona, Carlos I. Yamamoto, Marcelo R. Errera, Lucas Martin, Denis Rempel, Ana Flavia L. Godoi, Federal University of Parana - Curitiba, PR, Brazil
Abstract Number: 274 Working Group: Control Technology
Abstract The combination of recent changes in the composition of fuel, low-sulfur diesel fuel or biodiesel blends, and selective catalytic reduction (SCR) emission control systems brings new insights concerning the emission of gaseous and particulate pollutants. The major goal of our study was to quantify NO$_x, NO, NH$_3 and N$_2O emissions using a four-cylinder diesel engine operated with diesel and a blend of 20% soybean-biodiesel. The measurements were performed in a dynamometer using a 13-mode heavy-duty diesel engine equipped with an SCR system. The target gases were detected by an FTIR system; the speciation of BC was done using a multi-wavelength aethalometer. As expected, our results showed that NO$_x and NO concentrations in all tests using engine with an SCR system decreased, when compared with no exhaust aftertreatment. However, the use of aftertreatment produced significantly higher NH$_3 and N$_2O concentrations with all fuels tested. NH$_3 is a health hazardous gas, while N$_2O increases exacerbate the greenhouse effect. BC exhaust emissions indicated no significant optical difference between S10 and B20 emissions. Based on our experimental results we performed an AERMOD dispersion model analysis considering the City of Curitiba bus fleet equipped with diesel and engines using SCR emission control systems. Concerning BC, we expect that biodiesel exhaust has similar properties as fossil diesel exhaust. In this way, we expect that the climate benefits of bio-fuels due to CO$_2 might not outweigh the effects of the BC emissions.