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수소와 일산화탄소를 이용한 멀티채널 CDPF의 재생특성에 관한 연구
최광춘(Kwang Chun Choi),전광민(Kwang Min Chun),송순호(Soonho Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Diesel particulate filter(DPF) systems are being used to reduce the particulate matter emission of diesel vehicles. The DPF should be regenerated after certain driving hours or distance to eliminate soot in the filter. The most widely used method is active regeneration with oxygen at 550~650℃. Syngas(synthetic gas) can be used to regenerate the Catalyzed DPF(CDPF). The syngas was made by CPOx(Catalyzed Partial Oxidation) at reformer, that of mainly helpful component at DPF regeneration is hydrogen and carbon-monoxide. We use the hydrogen and carbon-monoxide model gas for regeneration characteristic of filter regeneration. The oxidation characteristics of PM with model gas supplied to filter were studied using partial flow system that can control temperature and flow rate independently. The filter is coated with washcoat loading of 25g/ft³ Pt/Al₂O₃-CeO₂, and multi-channel CDPF(MC-CDPF) was used. The DPF regeneration experiments were performed to investigate the effect of syngas exothermic reaction on soot oxidation in the filter. Before oxidation experiment, PM was collected about 8g/L to the filter at engine condition of 1500rpm, bmep 8bar and flow temperature of 200℃. Various conditions of temperature and concentration of H₂, CO gas were used for the tests. Regeneration of soot in the filter started at 2% H₂ and CO concentration respectively and inlet temperature of 250℃. Filter Regeneration occurs more actively as the model gas concentration becomes higher.