| EXPERIMENTAL STUDY ON THE CHARACTERISTICS OF NANO-PARTICLE EMISSIONS FROM A HEAVY-DUTY DIESEL ENGINE USING A UREA-SCR SYSTEM |
| S. LEE1, Y. CHO1, M. SONG2, H. KIM3, J. PARK4, D. BAIK5 |
1Kookmin University
2Fiber Technology Company
3Korea Institute of Machinary & Materials
4korea automoble testing & research institute
5Daejin University |
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| ABSTRACT |
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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 oC. In SEM scans of the collected PM, spherical particles were observed during urea injection, with sizes of approximately 200 nm to 1 |
| Key Words:
PM (Particulate Matter), NH3 slip, SCR (Selective Catalytic Reduction), SV (Space Velocity), AOC(Ammonia Oxidation Catalyst), CPC (Condensation Particle Counter), SEM (Scanning Electron Microscopy) |
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