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디젤배출가스중 PM 50% 저감을 위한 Flow-Through Trap 장치
최용택(Yongtaek Choi),김진각(Jingak Kim),이석규(Sukyu Lee),조규백(Gyu-Baek Cho),김영주(Young Joo Kim),이재수(Jae-Soo Rhee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A diesel particulate Flow-Through Trap (FTT) system, composed of stainless steel foam has been developed and evaluated. The basic concept of the system is to configure several different pore sizes of the foam filters gradually, from large pore sizes to small pore sizes, in order to achieve high efficiency of diesel PM reduction and simultaneously low pressure drop. Each component of the FTT system was coated with Sud-Chemie's proprietary catalyst support and further catalyzed with platinum for better performance. Multiple configurations of the FIT system were evaluated by varying pore sizes (20~50 PPI), substrate sizes, and the number of beds. Tests were conducted using 1.86 Liter and 4.4 Liter diesel engine. Based on the results of these engine tests, the FTT is found to be an effective device to remove more than 50% of PM from the diesel engine exhaust. The FTT prototypes can be regenerated successfully without any further active regeneration control when the exhaust gas temperature is maintained at 280℃ and higher.
Surface Analysis Study on ZIRLO Cladding Hulls Oxidized at Low Temperatures
전민구,최용택,이창화,강권호,박근일,Jeon, Min Ku,Choi, Yong Taek,Lee, Chang Hwa,Kang, Kweon Ho,Park, Geun Il Korean Radioactive Waste Society 2014 방사성폐기물학회지 Vol.12 No.3
본 논문에서는 X선 광전자 분광법(X-ray photoelectron spectroscopy, XPS)을 이용하여 ZIRLO (ZIRconium Low Oxidation) 피복관의 표면 산화 거동을 연구하였다. 산화 시간 (10-336 시간, $500^{\circ}C$) 및 산화 온도 ($400-700^{\circ}C$, 10 시간)에 따른 산화 특성변화를 관찰하였다. XPS peak 분석 결과, $500^{\circ}C$에서 산화된 피복관의 산화 시간이 24 시간이 될 때 $ZrO_2$ peak가 11.86% 관찰되었으며, 이후 산화 시간이 길어질수록 $ZrO_2$의 비율이 17.93%까지 (336 시간) 증가하는 것이 확인되었다. 반면, 10 시간 산화된 피복관에서 5.68% 존재하던 ZrO 상은 산화 시간이 24 시간으로 늘어남에 따라 사라지는 것이 관찰되었다. 산화 온도 증가에 의한 영향 분석 결과에서는 산화 온도가 $400^{\circ}C$에서 500, 600, $700^{\circ}C$로 증가할 때 ZrO 상의 비율이 0% 부터 5.68, 8.31, 9.16%로 증가하는 것이 확인되었다. 이 때, $ZrO_2$ 상은 $700^{\circ}C$에서 산화된 시료에서만 관찰되었다. ZrO 상의 형성 메커니즘은 불명확하지만, 고온에서 공기 중의 수분과 Zr의 반응으로 인해 $Zr(OH)_4$ 상의 형성이 가속되는 것으로 예상된다. 본 논문에는 $500^{\circ}C$에서 산화된 ZIRLO 피복관과 이들의 염소화 반응 특성에 대한 논의도 포함되었으며, 염소화 반응 진행 가능성에 있어서 산화막의 두께가 중요한 역할을 하는 것으로 보여진다. Surface oxidation behavior of ZIRLO (ZIRconium Low Oxidation) hulls was investigated using an X-ray photoelectron spectroscopy (XPS) technique. The effects of oxidation time (10-336 h at $500^{\circ}C$) and temperature ($400-700^{\circ}C$ for 10 h) were studied. Deconvolution results of the hulls oxidized at $500^{\circ}C$ revealed that a $ZrO_2$ phase appeared after 24 h (11.86%), and an increase in the $ZrO_2$ ratio was observed when the hulls were oxidized for 336 h (17.93%). On the other hand, the ZrO phase which employed 5.68% in the 10 h oxidized sample disappeared when the oxidation time increased to 24 h. The XPS results also showed that an increase in the oxidation temperature resulted in an increase in the ratio of ZrO, which increased from 0 to 5.68, 8.31, and 9.16% when the oxidation temperature increased from 400 to 500, 600, and $700^{\circ}C$, respectively. $ZrO_2$ phase was observed only in the sample that was oxidized at $700^{\circ}C$. The mechanism of ZrO formation was not conclusive, but it was suggested that a formation of hydroxide might have been accelerated at elevated temperatures leading to a formation of a $Zr(OH)_4$ phase. The relationship between the surface oxidation status of the hulls oxidized at $500^{\circ}C$ and their chlorination reaction feasibility was discussed, and it was suggested that the thickness of the oxide layer is an important parameter that determines the chlorination reaction feasibility.