Experimental study on the characteristics of nano-particle emissions from a heavy-duty diesel engine using a urea-SCR system |
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| Authors: | S?Lee Y?Cho M?Song H?Kim J?Park Email author" target="_blank">D?BaikEmail author |
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| Institution: | 1.Graduate School of Automotive Engineering,Kookmin University,Kookmin,Korea;2.Fiber Technology Company,Research & Development,Gyeonggi,Korea;3.Korea Institute of Machinary & Materials,Engine Research Team,Daejeon,Korea;4.Korea Automobile Testing & Research Institute,Gyeonggi,Korea;5.Department of Computer-aided Mechanical Design Engineering,Daejin University,Gyeonggi,Korea |
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| Abstract: | Particulate matter in diesel engine exhaust, particularly nano-particles, can cause serious human health problems including
diseases such as lung cancer. Because diesel nano-particle issues are of global concern, regulations on particulate matter
emissions specify that not only the weight of particulate matter emitted but also the concentration of nanoparticles must
be controlled. This study aimed to determine the effects on nano-particle and PM emissions from a diesel engine when applying
a urea-SCR system for NOx reduction. We found that PM weight increases by approximately 90% when urea is injected in ND-13 mode over the emission without
urea injection. Additionally, PM weight increases as the NH3/NOx mole ratio is increased at 250 °C. In SEM scans of the collected PM, spherical particles were observed during urea injection,
with sizes of approximately 200 nm to 1 μm. This study was designed to determine the conditions under which nano-particles
and PM are formed in a urea-SCR system and to relate these conditions to particle size and shape via a quantitative analysis
in ND-13 mode. |
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