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Euro 2 기준 LNG-경유 혼소엔진의 배출가스 특성에 관한 연구
조규백(Gyu Baek Cho),김종민(Chongmin Kim),김동식(Dong Sik Kim),김홍석(Hong Suk Kim) 한국가스학회 2011 한국가스학회지 Vol.15 No.1
대형 디젤엔진은 주행거리가 길고 배기량이 크기 때문에 차량의 대수는 상대적으로 적지만 대기환경에 미치는 영향은 크다. 시내를 주행하는 시내버스의 경우 한일 월드컵을 계기로 CNG 버스로 전환되었다. 그러나 대형트럭과 장거리 시외버스의 경우 주행거리가 길고 CNG 충전소가 대도시의 시내버스 차고지 위주로 설치되어 있어 이용이 불가능하였다. 단열용기의 적용으로 천연가스를 압축상태가 아닌 액체 상태로 보관이 가능해져 주행거리가 긴 대형트럭이나 장거리 시외버스로의 적용이 가능해졌으며, 혼소엔진의 경우 LNG 충전이 어려운 지역에서는 디젤로 운행이 가능하다. 이와 같은 장점으로 인하여 석유 의존도를 크게 낮출 수 있어 에너지원의 다변화가 가능하며, 디젤차의 고질적인 단점으로 여겨왔던 매연 및 질소산화물뿐만 아니라 저탄소 연료를 사용함으로서 대표적인 온실가스중의 하나인 이산화탄소도 10%이상 저감할 수 있었다. Heavy duty diesel engine has relatively small portion of whole vehicles due to long drive distance and large engine displacement, but largely influences atmosphere environment. City buses changed to CNG (Compressed Natural Gas) bus with Korea-Japan Worldcup. Heavy duty truck and intercity bus, however, were impossible to use CNG because those kinds of vehicles had long drive distance and CNG station was installed mainly at the around of the bus garage of city. Insulation container storing the natural gas as a liquid makes heavy duty truck and intercity bus possible to use the natural gas. Drive using diesel is possible where is hard to recharge the gas. With LNG (Liquefied Natural Gas), the dependence on oil is largely decreased, PM (Particulate Matter) and NOx which is chronic disadvantage of diesel is remarkably reduced and finally CO2, the representative green house gas, is reduced over 10%.
선박용 고유황유에서 산화촉매 NO/NO₂ 전환 특성에 관한 연구
조규백(Gyu Baek Cho),김재희(Jaehee Kim),김종민(Chongmin Kim),윤천석(Cheon Seog Yoon),김홍석(Hong Suk Kim),김용진(Young Jin Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Hazardous emissions gas material from marine engine. In this study, the conversion characteristics of NO/NO₂, which is from the marine engine using high-sulfur fuel, is analyzed. For advancing the performance of SCR, oxidation catalyst technology is applied to the SCR, and the characteristics of Light-off temperature is calibrated according to materials of washcoat. Also, The calibration of conversion rate from samples is executed with variety of space velocities. Finally, the technology about NO/NO₂ conversion characteristics from diesel engine used by ship is secured, more over the possibility to apply the SCR to the marine engine is studied
조규백(Gyu Baek Cho),김홍석(Hong Suk Kim),강정호(Jeong Ho Kang) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.6
비도로 차량용 디젤엔진의 Tier 4 interim 규제를 만족하기 위하여 입자상물질과 질소산화물 배출량은 현행 규제 대비 각각 95%, 30% 저감되어야 하며, 입자상 물질을 저감하기위한 방법으로 디젤산화촉매, 부분유량 매연 여과장치 및 매연여과장치가 비도로 차량용 디젤엔진에 적용될 수 있다. 또한 질소산화물을 저감하기위해 배기가스 재순환방법, 선택적 환원촉매와 희박 질소산화물 포집장치 등이 적용될 수 있다. 본 연구에서는 56㎾급 off-road 차량에서의 입자상물질과 질소산화물을 저감하기위해 매연여과장치와 고압루프 배기가스재순환 시스템이 연구되었다. 실험결과로서 디젤산화촉매와 매연여과장치는 입자상물질을 저감하는데 매우 효과적이었으며 낮은 배압과 함께 출력손실도 5%이내였다. 고압루프 배기가스재순환을 적용한 결과 중 저부하 조건에서 효과적으로 질소산화물을 저감하였으며 배기가스재순환율이 높을수록 질소산화물의 저감율도 증가하였다. To meet the requirements of the Tier 4 interim regulations for off-road vehicles, emissions of particulate matter (PM) and nitrogen oxides (NOx) must be reduced by 95% and 30%, respectively, compared to current regulations. In this research, both the DPF and HPL EGR systems were investigated, with the aim of decreasing the PM and NOx emissions of a 56-㎾ off-road vehicle. The results of the experiments show that the DOC-DPF system is very useful for reducing PM emissions. It is also found that the back pressure is acceptable, and the rate of power loss is less than 5%. By applying the HPL EGR system to the diesel engine, the NOx emissions under low- and middle-load conditions are reduced effectively because of the high differential pressure between the turbocharger inlet and the intake manifold. The NOx emissions can be decreased by increasing the EGR rate, but total hydrocarbon (THC) emission increases because of the increased fuel consumption needed to compensate for the power loss caused by EGR and DPF.
김종민(Chongmin Kimm),조규백(Gyu Baek Cho),김동식(Dong Sig Kim),정용일(Yougnil Jeong),오권오(Kwon Oh Oh),신병선(Byeong-Seon Shin),김만영(Man Young Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The experimental testing covers flow and pressure drop behavior with air and exhaust gas, NOx reduction efficiency measurements as function of space velocity and volume of metal foam catalyst . The testing starts real exhaust testing on the engine bench as well as vehicle tests with legislated driving cycles like ESC mode. The preliminary result shows that the metal foam catalyst has a potential for reaching a reduction rate of the order of 50% with acceptable pressure drop. In this work, engine evaluation of SCR coated metal foams has been conducted to determine the viability of a technology. Steady-state engine evaluations demonstrated that NOx conversions can be achieved for SCR coated metal foams
전기집진 기제를 조합시킨 DPF용 금속 폼 필터의 여과 특성
박석주,이동근,김진현,조규백,김홍석,정용일,Park, Seok-Joo,Lee, Dong-Geun,Kim, Jin-Hyun,Cho, Gyu-Baek,Kim, Hong-Suk,Jeong, Young-Il 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
Filtration studies, using simulated test nanoparticles or diesel nanoparticles, have been performed about Inconel foam filters for DPF combined with electrostatic precipitation. The simulated test particles were synthesized by laser ablation in the nitrogen atmosphere at the standard condition. The diesel particles were exhausted from the diesel engine driven on the condition of idle or load mode. Filtration efficiency of the metal foam filter is very low because most of particles are penetrated through the large pores of filter. However, the efficiency was considerably improved by applying the electric field to the filter and/or charging the nanoparticles. Nevertheless, the pressure drop of filter hardly increased because the filter-pores were not clogged by deposited particles and kept open.