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경유분사를 이용한 강제재생방식 DPF 시스템 연비 손실 최소화를 위한 재생시점 고찰
나승우(Seung-Woo Rah),정연규(Youn-Kyoo Choung),오광철(Kwang-chul Oh) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.5
The number of vehicles applied diesel engine are rapidly rising for fuel economy. Accompanying this trend, application of an after-treatment system is strictly required as a result of reinforced emission regulation. The Diesel Particulate Filter (DPF) system is considered as the most efficient method to reduce particulate matter by car makers but also in retrofit market. In this paper we discussed the optimization of active regeneration timing by comparing the fuel consumption from back pressure caused by PM loading and from active regeneration. The effects of back pressure of DPFs during PM loading, active regeneration condition and engine emission(PM) on additional fuel consumption are experimentally investigated and the proper regeneration timings according to DPF systems and fuel loss for 160,000㎞ are determined.
자연재생식 매연여과장치의 시험방법에 따른 재생특성 연구
황진우(Jin Woo Hwang),박용희(Yong Hee Park),김종춘(Jong Chun Kim),나승우(Seung Woo Rah),이창식(Chang Sik Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
For more exact evaluation of the substantial regeneration performance of the passive DPF system matched well with operating conditions in field application, this work is to investigate the performance of the two DPF system, a CSF(Catalysed Soot Filter) and an oxicat+CSF not only on steady cycle but also on transient cycle of dynamometer test based on real road driving pattern instead of the BPT(Balance Point Temperature) test method. And the emission reduction characteristics of the two DPF system also have been compared with each other on steady cycle. To verify the results from the transient cycle test, field tests has been conducted on two equivalent vehicles of which the operation temperature condition of the exhaust gas was similar to that of the transient cycle. The comparison of test results from the dynamometer and field shows that the transient mode is useful to evaluate the actual regeneration capacity for a DPF system since cycle average temperature is very similar to field driving condition. Also, the exhaust gas temperature is very important factor for the regeneration of continuously regenerating diesel particulate filter.
단상 및 2 상 혐기성 소화에 의한 주정폐수 처리에 관한 연구
박준환,정연규,나승우 대한상하수도학회 1993 상하수도학회지 Vol.7 No.1
The objectives of this paper are to present data to illustrate how an advanced digestion process, two-phase digestion, can provide superior performance in terms of waste stabilization efficiency and net energy recovery. As the result, it is possible to separate enrichment cultures of acidogenic and methanogenic organisms in isolated environments by kinetic control involving manipulation of dilution rates. In single-phase digestion process, HRT and COD loading for effective operation were 14.29 days and 2.33㎏ COD/㎥ day, but two-phase digestion may be conducted efficiently at 7 days of HRT and 5.71㎏ COD/㎥ day of loading. Data from this studies showed that the two-phase process is better than single-phase digestion under all test conditions when compared on the bases of gas yield and production rate, reductions of COD and VS, buffer capacity, and unconverted volatile acids in the effluent.