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EURO-Ⅳ대응 상용디젤엔진의 SCR 시스템 적용에 따른 나노입자 배출 특성(Ⅱ)
이천환(Chunhwan Lee),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이종인(Jongin Lee),전성용(Sungyong Jeon),이춘범(Chunbeom Lee),이동인(Dongin Lee),김상호(Sangho Kim),한현식(Hyunsik Han),배재호(Jaeho Bae),김은석(Eunseok Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is well known that two representative methods satisfy the condition of EURO-Ⅳ regulation from EURO-Ⅲ. The first method is the reduction of NOx in an engine operation by utilizing EGR and the elimination of increased PM by DPF. However, it results in bad fuel efficiency. The second is the strategy to reduce PM and emit the high NOx concentration. In other words, the concentration of PM produced by high efficiency combustion sufficiently meets the requirement of regulation, and NOx generated in this process can be removed by SCR system. While it has a good fuel efficiency relative to the first method mentioned above, its social infrastructure is demanded. In this paper, the number distribution of nano PM has been evaluated analyzed by Electrical Low Pressure Impactor(ELPI) in case of Urea-SCR system applied. From the results, The particle number was increased slightly in proportion to the amount of urea injection on Fine Particle Region, whether AOC is used or not.
EURO-Ⅳ대응 상용디젤엔진의 SCR 시스템 적용에 따른 나노입자 배출 특성
이천환(Chunhwan Lee),오광철(Kwangchul Oh),김덕진(Deokjin Kim),이종인(Jongin Lee),전성용(Sungyong Jeon),이춘범(Chunbeom Lee),이동인(Dongin Lee),김상호(Sangho Kim),한현식(Hyunsik Han),배재호(Jaeho Bae),김은석(Eunseok Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is well known that two representative methods satisfy the condition of EURO-Ⅳ regulation from EURO-Ⅲ. The first method is the reduction of NOx in an engine operation by utilizing EGR and the elimination of increased PM by DPF. However, it results in bad fuel efficiency. The second is the strategy to reduce PM and emit the high NOx concentration. In other words, the concentration of PM produced by high efficiency combustion sufficiently meets the requirement of regulation, and NOx generated in this process can be removed by SCR system. While it has a good fuel efficiency relative to the first method mentioned above, its social infrastructure is demanded. In this paper, the number distribution of nano PM has been evaluated analyzed by Electrical Low Pressure Impactor(ELPI) in two different case of engine condition, EURO-Ⅲ base engine with DPF system and EURO-Ⅳ level engine(modified from EURO-Ⅲ) with SCR system. From the result of this study, the number distribution of nano PM in a modified EURO-Ⅳ engine was similar level compared to the result of EURO-Ⅲ engine installed DPF system. In case of EURO-Ⅳ engine with SCR system, the particle number was increased slightly in proportion to the amount of urea injection on big size particles, whether AOC is used or not.
EURO-Ⅳ 대응 배기정화 시스템 설계 및 최적화 기술 개발
이천환(Chunhwan Lee),이춘범(Chunbeom Lee),김성중(Sungjoong kim),서동규(Dongkyu Seo),유영면(Yungmyun Yoo),이동인(Dongin Lee),한현식(Hyunsik Han) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Limited petroleum fuel and green house effect are increasing the necessity of CO₂ reduction policy of every country and high fuel efficiency automobile. The one way in the present is diesel fueled vehicle is applied to satisfy these requests. In case of diesel vehicles, there is a synergy more than 20% fuel efficiency compared with gasoline vehicles but particle material and nitrogen oxide emissions are remained to overcome.<br/> In this paper, diesel after-treatment and cooled EGR systems are evaluated and tested s that optimal technologies are developed for simultaneous PM/NOx reduction to meet the EURO-Ⅳ regulation. For the DePM, three different size hybrid DPF (DOC+catalyzed DPF) systems are used and for the DeNOx, cooled EGR (CEGR) system is used. At the results of evaluation and test on 3.3L EURO-Ⅱ diesel engine, the HDPF systems had 85-90% PM reduction rate ad CEGR systems are achieved to 30%-60% NOx reduction rate. <br/> From the results, if these technologies are applied to EURO-Ⅲ engine, the emission level will be estimated enough to satisfy the EURO- Ⅳ regulation.
RIE 공정으로 제조된 블랙 실리콘(Black Silicon) 층을 사용한 표면 증강 라만 산란 기판 제작
김형주 ( Hyeong Ju Kim ),김봉환 ( Bonghwan Kim ),이동인 ( Dongin Lee ),이봉희 ( Bong-hee Lee ),조찬섭 ( Chanseob Cho ) 한국센서학회 2021 센서학회지 Vol.30 No.4
In this study, Ag was deposited to investigate its applicability as a surface-enhanced Raman scattering substrate after forming a grasstype black silicon structure through maskless reactive ion etching. Grass-structured black silicon with heights of 2 - 7 μm was formed at radio-frequency (RF) power of 150 - 170W. The process pressure was 250mTorr, the O<sub>2</sub>/SF<sub>6</sub> gas ratio was 15/37.5, and the processing time was 10 - 20 min. When the processing time was increased by more than 20 min, the self-masking of Si<sub>x</sub>O<sub>y</sub>F<sub>z</sub> did not occur, and the black silicon structure was therefore not formed. Raman response characteristics were measured based on the Ag thickness deposited on a black silicon substrate. As the Ag thickness increased, the characteristic peak intensity increased. When the Ag thickness deposited on the black silicon substrate increased from 40 to 80 nm, the Raman response intensity at a Raman wavelength of 1507 / cm increased from 8.2 × 10<sup>3</sup> to 25 × 10<sup>3</sup> cps. When the Ag thickness was 150 nm, the increase declined to 30 × 10<sup>3</sup> cps and showed a saturation tendency. When the RF power increased from 150 to 170 W, the response intensity at a 1507/cm Raman wavelength slightly increased from 30 × 10<sup>3</sup> to 33 × 10<sup>3</sup> cps. However, when the RF power was 200 W, the Raman response intensity decreased significantly to 6.2 × 10<sup>3</sup> cps.