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디젤연료의 열분해를 이용한 매연 입자 생성에 대한 연구
김종훈(Jonghun Kim),오광철(Kwangchul Oh),남연우(Younwoo Nam),이천환(Chunhwan Lee),이춘범(Chunbeom Lee),고상철(Sangchul Ko) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The experiment of diesel pyrolysis has been performed to clarify the soot formation process without oxidation. The influences of temperature, residence time and lube oil addition on soot formation have been investigated with the particle size distribution, morphology, thermal analysis and C/H ratio. The results show that soot formation from diesel pyrolysis strongly depends on both temperature and residence time. The critical temperature for soot evolution is about 1100 oC, of which primary particle diameter is about 20 ㎚. As the temperature and residence time increase, diesel soot became more matured particle, i.e. the higher C/H ratio and the larger particle size, and the higher ignition temperature. The carbonization process of diesel soot through pryrolysis is also found to be weakly affected by dosing of 5 % lube oil to diesel fuel. The results could provide not only an information for the modelling of diesel soot formation without oxidation but also the methodology on the design of soot generator for the after treatment system.
DPF의 Crack 상태에 따른 PM 배출 특성에 관한 실험적 연구
김종훈(Jonghun Kim),오광철(Kwangchul Oh),이경복(Kyungbok Lee),김덕진(Deokjin Kim),이천환(Chunhwan Lee),이춘범(Chunbeom Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Several problems with exhaust gas emitted by diesel engine must be solved. Especially particulate matter (PM) is the major concerns. To reduce emission of diesel soot, diesel particulate filter (DPF) has become widely known as an indispensable after-treatment component of the purification of the PM in the diesel exhaust gas. DPF is damaging by various forms such as whitening and crack due to controlled or uncontrolled regeneration and uncertain reasons, and there is no clear criterion to judge the cracked filter. So, we hope to classify the degree of filter crack using the particle emission characteristics. Filtration efficiency of PN for cracked filter is varying from time to time, it is showing a big differences by the test number. But, some failure shows no difference of PM filtration efficiency with fresh filter. In this study, we hope to find two objectives. First, it is find the reduction efficiency of PM mass & number for fresh and cracked filters. Second, we standardize the crack level of filter.
디젤연료 열분해 매연 입자 생성기를 이용한 DPF 담체의 Nano-PM 정화 효율 비교
김종훈(Jonghun Kim),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이천환(Chunhwan Lee),이춘범(Chunbeom Lee),고상철(Sangchul Ko) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The experiment of diesel pyrolysis has been performed to clarify the soot formation process without oxidation. The influences of temperature, residence time on soot formation have been investigated with the particle size distribution, thermal analysis and C/H ratio. The results show that soot formation from diesel pyrolysis strongly depends on both temperature and residence time. The critical temperature for soot evolution is about 1100℃, of which primary particle diameter is about 20 ㎚. As the temperature and residence time increase, diesel soot became more matured particle, i.e. the higher C/H ratio and the larger particle size, and the higher ignition temperature. The well organized soot generator have been used in the investigation of Nano PM filtration efficiency of developed Si₃N₄ DPF.
Uncracked Filter와 Cracked Filter의 PM 배출 특성에 관한 실험적 연구
김종훈(Jonghun Kim),이경복(Kyoungbok Lee),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이천환(Chunhwan Lee),이춘범(Chunbeom Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Several problems with exhaust gas emitted by diesel engine must be solved. Especially particulate matter(PM) is the major concerns. To reduce emission of diesel soot, diesel particulate filter(DPF) has become widely known as an indispensable after-treatment component of the purification of the PM in the diesel exhaust gas. Recently, the many studies published concerning that the nano-particles are the harmful effect on the human body. So PM emission regulation is changed from the mass regulation to the number regulation. Due to tightening emission regulations, the monitoring for DPF is required. As monitoring term of DPF, the research is needed on the emission characteristics of PM number(PN) according to the level of crack of DPF. In this study, the experiments were performed using a 7.6L DL08S heavy duty engine, and test cycle used in this experiments is ESC mode. The experiments were conducted on the emission characteristics of PM number(PN) depending on the level of cracked DPF. Through these experiments, we can determine whether DPF is the failure. Therefore, the emission characteristics of PN is very important parameter for the monitoring about DPF.