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디젤엔진의 후처리장치로서 플라즈마 시스템에 관한 실험적 연구
유경현(Kyunghyun Ryu),박진철(Jinchul Park),최규호(Kyuho Choi),석동찬(Dongchan Seok),이봉주(Bongju Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The selective catalytic reduction (SCR) system used to reduce NOx in diesel engines requires an NO/NO₂ ratio of about 1 in exhaust emissions to realize the fast SCR mode at temperatures lower than 300°C. This study investigated the characteristics of a plasma system as a pre-active apparatus for the fast SCR reaction mode of an SCR system. Plasma was generated by the pulse corona discharge (PCD) method with a four-channel wire-cylinder reactor. This study showed that plasma was easily generated in the exhaust gas by the PCD system, and the peak voltage of the normal state condition for plasma generation was generally 12 ㎸. The PCD system easily converted NO into NO₂ at lower temperatures and the NO/NO₂ conversion ratio increased with the discharge current for plasma generation. The PCD system also activated the diesel oxidation catalysts (DOC) system to reduce CO emissions.