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승용 디젤차량에서 Urea-SCR 시스템의 NOx 저감 특성에 관한 실험적 연구
박승원(Seungwon Park),이성욱(Seangwock Lee),조용석(Yongseok Cho),강연식(Yeonsik Kang) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.4
LNT(Lean NOx Trap), LNC(Lean NOx Catalyst), SCR(Selective Catalytic Reduction)과 같은 NOx 저감기술은 상용차뿐만이 아닌 승용차량 성능향상을 위해 지속적으로 개발이 진행되고 있다. 특히 Urea-SCR 시스템은 연료손실 없이 이론상 100%에 가깝게 NOx를 저감하는 가장 효과적인 기술로 환원반응으로 배기가스를 N₂와 H₂O로 배출하기 위해 환원제인 요소수를 분사해야한다. 하지만 엔진에서와는 달리 실제차량에서의 적용은 SCR 효율이 떨어지게 된다. 따라서 실제차량에서의 SCR 효율을 극대화하는 기술개발이 요구되고 있는 실정이다. 본 연구에서는, Post EURO-6 배기가스 규제에 대응하기 위한 디젤승용차량에서의 Urea-SCR의 NOx 저감 성능에 의한 저감효율의 극대화를 목적으로 실차용 Urea-SCR 시스템위한 기초자료로 제시하고자 한다. NOx reducing technique such as LNT, LNC , and selective catalytic reduction (SCR) have been developed and applied, especially on heavy-duty vehicles. However, it is expected that NOx reduction techniques will also be applied to diesel passenger vehicles. The urea-SCR system is receiving attention as the most effective NOx reduction technology without a fuel penalty. Thus, many advanced countries are developing this technology. The urea-SCR system sprays an aqueous urea solution that separates NOx into N₂ and H₂O, which are harmless and emitted into the atmosphere. The urea injected in front of the SCR catalyst should be changed to 100% NH₃, which is required for NOx reduction in the SCR system to maximize the reduction efficiency. The purpose of this study was to determine the basic data for the urea-SCR system to maximize the NOx reduction efficiency by understanding the NOX reduction characteristics in a real passenger vehicle to comply with the post EURO-6 emission regulation.
박승원 ( Seungwon Park ) 대한영어영문학회 2015 영어영문학연구 Vol.41 No.3
The purpose of this study is to analyze the effects of integrative and self-directed English learning and teaching on the basis of OPIc-based speaking and writing tests including TOEIC-based listening and reading tests for sophomore students in college. The research question is the four language proficiency of English such as listening, speaking, reading and writing between experimental and control groups may be discrepant, respectively. The results of speaking and writing tests show that OPIc-based speaking and writing lessons might be appropriate in English classes in college because the students are able to not only have an advantage to improve their communicative competence but also prepare for recruiting requirement before graduation. This study implies that the speaking and writing lessons suggested in this research will be actually conducted in the classroom. (Konyang University)
박승원 ( Seungwon Park ) 전북대학교 인문학연구소 2018 건지인문학 Vol.0 No.23
Over 70% of Finnish citizens are able to communicate in English. This ability can be the good result of systematic formal education. The purpose of this study is to suggest some implications for the development of English education in Korea by examining the English education system in Finland. Communication is the center of English class and it deals with the skills of listening, speaking, reading and writing in English from the beginning. Through the introduction of content and language-integrated teaching methods, students are taught in English by selecting a common theme from different subjects. It creates an environment in which English is easily accessible so that everyone is exposed to English in Finland without using any medium. The evaluation method of communication-oriented English education is process-based. The availability of high quality English language instruction in Finland can help answer the question of educating high quality teachers. In particular, teacher education in Finland focuses on practical knowledge through a close connection of theory and practice compared to that in Korea.
CNG 機關의 水素混合率變化에 따른 性能및 稀薄燃燒特性에 관한 實驗的硏究
박승원(Seungwon Park),김인구(Ingu Kim),이성욱(Seangwock Lee),조용석(Yongseok Cho) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Recently, the world faces the environmental problem such as air pollution due to harmful gas discharged from car and abnormal climate due to the green-house gases increased by the discharge of CO₂. So, the research on several fuels has been actively progressed throughout the world. Compressure Natural Gas(CNG), one of alternative for this problem, is less harmful, compared to the existing fossil fuel, as gaseous fuel, and less carbon in fuel ingredients and carbon dioxide generation rate relatively favorable more than the existing fuel. However, CNG fuel has the weakness of slow flame propagation speed and difficult fast burn. On the other hand, hydrogen does not include carbon in fuel ingredients, and does not discharge harmful gas such as CO and HC. Moreover, it has strength of quick burning velocity and ignition is possible with small ignition energy source and it`s has wide Lean Flammability Limit. If using this hydrogen with CNG fuel, the characteristics of output and discharge gas is improved by the mixer’s burning velocity improved, and, at the same time, is possible to have stable lean combustion with the reduction of CO₂ expected. Therefore, this research tries to identify the characteristics of engine and emission gas when mixing CNG fuel and hydrogen in each portion and burning them in spark igniting engine, and grasp the combustion stability and emission gas characteristics according to the change of access air ratio, and use it as the basic data of hydrogen-CNG premixed engine.
승용 디젤기관에서 Urea-SCR 시스템의 NOX 저감 및 NH₃ slip 특성에 관한 실험적 연구
백윤도(Youndo Baek),김종민(Jongmin Kim),박승원(Seungwon Park),이성욱(Seangwock Lee),조용석(Yongseok Cho),강연식(Yeonsik Kang) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The regulation of harmful emission including CO₂ is getting more strict recently according to greenhouse gases problem caused by increasing of CO₂ emission. The Diesel engine provides many positive aspect such as higher thermal efficiency and less CO₂ emission. However, there are some problem on PM(Particulate Matters) and NOX emissions. PM has decreased by around 90% according to development of DPF technology. NOX reducing technique such as LNT, LNC, SCR has been developed and applied especially on heavy duty vehicle. But it is expected the NOX reducing technique is applied on passenger diesel vehicle, as well. The Urea-SCR system is getting attention as the most effective NOX reducing technology without fuel efficiency incline, so that many advanced countries are developing this technology. Urea-SCR system sprays Urea- aqueous solution to take apart into N₂ and H₂O and emit into the atmosphere as reducing agent which is harmless. Injected Urea in front of SCR catalyst should be changed to NH₃ 100% required for NOX reduction in SCR system to maximize reducing efficiency. In this study, it is purpose to look for the α ratio before the NH₃ slip at the load of engines by performance of the catalyst to find the maximum reduction rate of NOX. The α-ratio in the Urea-SCR system will be at one to one ratio by recognizing the NOX value in general. However, it is possible to inject NH₃ more by occlusion performance of the catalyst at the temperature condition so that there will be much reaction. As a result, there will be effect to improve the reduction rate of NOX. Therefore, it is able to exert much improved maximum performance the reaction of Urea-SCR by injecting NH₃ more as the α ratio before slipping to match the performance of the catalyst. Thus it becomes the injection strategy to reduce the nitrogen oxide. In conclusion, it is possible to create not only the exhaust regulations Euro-6 but also the Urea-SCR which satisfies Post Euro-6.
암모니아 기체 환원제의 SCR장치 적용 가능성에 관한 연구
정우식(Woosik Jung),이성욱(Seangwock Lee),박승원(Seungwon Park) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Urea-SCR device needs space to install urea water container, injector and controller. Also it stack “solid mineral deposit(urea salt)” in the exhaust temperature of 200℃. While ammonia gas injection(solid scr) system have not only solving these problems but also advantage in control. Therfore, ammonia gas injection system can effectually response “Real Driving Emission -Light Duty Vehicle measurement(RDE-LDV)” to start in september 2017. In conclusion, this study established characteristics of the ammonia gas injection system by simulation engine.