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디젤 분사 특성이 Biogas-디젤 혼소엔진 성능에 미치는 영향
이선엽 ( Sun Youp Lee ),김영민 ( Young Min Kim ),이장희 ( Jang Hee Lee ) 한국분무공학회 2010 한국액체미립화학회지 Vol.15 No.4
Due to its carbon-neutral nature, biogas generated from anaerobic digestion or fermentation of biodegradable wastes is one of the important renewable energy sources to reduce global warming. It is mainly composed of methane and various inert gases such as CO2 and N2, and the actual composition of biogas significantly varies depending on the origin of anaerobic digestion process. Therefore, in order to effectively utilize this fuel as an energy source for electricity, it is important to develop power generation engines which can successfully apply biogas with significant composition variations. In this study, efforts have been made to develop a diesel-biogas duel fuel engine as a way to achieve such a stable power generation. The effects of diesel fuel injection quantity and pressure on stable combustion and engine performance were investigated, and an impact of diesel fuel atomization was discussed. The engine test results show that there exists a 2 stage combustion which consists of diesel pilot fuel burning and premixed biogas/air mixture burning in dual fuel engine operation and optimum diesel injection parameters were suggested for biogases with various compositions and heating values.
박철웅(Cheol Woong Park),이선엽(Sun Youp Lee),김창기(Chang Gi Kim),원상연(Sang Yeon Won),이장희(Jang Hee Lee) 한국가스학회 2010 한국가스학회지 Vol.14 No.1
최근 들어 유럽 및 미국을 중심으로 각광받고 있는 가스화 열병합 설비는 석탄이나 바이오매스, 폐기물로부터 지역의 전기 및 냉난방 에너지를 공급하는 중소형 규모의 에너지 시스템으로서 시장적 측면이나 기술적 측면에서 그 활용 가능성이 매우 밝은 것으로 예견되고 있다. 가스화로부터 얻어지는 합성가스는 일반적으로 가스엔진, 스털링 엔진, 마이크로 가스터빈 및 중소형 가스터빈 등이 원동기 연료로 사용될 수 있다. 그러나 가스화를 통한 합성가스는 일반적으로 LPG, CNG와 같은 고발열량 가스연료에 비해 발열량이 낮고, 반응성 및 화염속도도 매우 큰 차이를 보인다. 본 연구는 저발열량의 합성가스연료를 이용한 고효율 전소엔진 개발의 전 단계로서 60kW급 디젤혼소엔진을 개발하였다. 저발열량의 합성가스를 모사하기 위해 CNG에 질소를 희석한 연료를 사용하였으며, 디젤 연료 분사를 제어하기 위한 인젝터 드라이버 및 ECU를 적용하였다. The interest on the utilization of landfill gases and biogases for energy production has been increasing due to environment concerns and global warming caused by burning fossil fuels, renewable nature of these gases. Using those synthesis gases to generate energy with engine encourages more efficient collection reducing emissions into the atmosphere and generates revenues for the operators. However the lower calorific value of synthesis gases than that of LPG or CNG affects the combustion stability and power output. Thus it becomes necessary to address disadvantages involved by studying synthesis gases in technological perspective. This paper discussed synthesis gas as a fuel for 60kW dual-fuel engine to produce power in an effective way. The methane diluted with N₂ was used as a fuel and developed ECU and injector driver facilitated the investigations with diesel fuel.
EGR 제어를 통한 디젤 및 바이오디젤의 저온연소 특성 비교
이용규 ( Yong Gyu Lee ),장재훈 ( Jae Hoon Jang ),이선엽 ( Sun Youp Lee ),오승묵 ( Seung Mook Oh ) 한국액체미립화학회 2011 한국액체미립화학회지 Vol.16 No.3
Due to the oxygen contents in biodiesel, application of the fuel to compression ignition engines has significant advantages in terms of lowering PM formation in the combustion chamber. In recent days, considerable studies have been performed to extend the low temperature combustion regime in diesel engines by applying biodiesel fuel. In this work, low temperature combustion characteristics of biodiesel blends in dilution controlled regime were investigated at a fixed engine operating condition in a single cylinder diesel engine, and the comparisons of engine performances and emission characteristics between biodiesel and conventional diesel fuel were carried out. Results show that low temperature combustion can be achieved at O2 concentration of around 7~8% for both biodiesel and diesel fuels. Especially, by use of biodiesel, noticeable reduction (maximum 50%) of smoke was observed at low and middle loads compared to conventional diesel fuel. In addition, THC(total hydrocarbon) and CO(Carbon monoxide) emissions decreased by substantial amounts for biodiesel fuel. Results also indicate that even though about 10% loss of engine power as well as 14% increase of fuel consumption rate was observed due to lower LHV(lower heating value) of biodiesel, thermal efficiencies for biodiesel fuel were slightly elevated because of power recovery phenomenon.
연료분무 및 연소 3 : 압축착화 엔진에서 분사압이 저온연소에 미치는 영향
장재훈 ( Jae Hoon Jang ),이선엽 ( Sun Youp Lee ),이용규 ( Yong Gyu Lee ),강석원 ( Seo Kwon Kang ),오승묵 ( Seung Mook Oh ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
압축착화 엔진에서 저온연소 기술은 엔진 연소실 내 화확반응이 질소산화물(NOx) 및 입자상 물질(PM)의 발생이 동시에 억제되는 저온 산화 영역에서 이루어지도록 하는 연소기술이다. 저온연소를 달성하는 방법으로는 크게 대용량이 EGR 을 공급하고 연료분사시기를 진작시키는 high dilution 방법과 적당량의 EGR을 공급하는 대신 연료를 TDC 근체에서 분사하는 late-injection 방법 (일명 Modulated Kinetics)으로 나눌 수 있다. 이번 연구에서는 이 중 MK 방법을 사용하여 저온연소 운전영역에서 연료 분사압력의 변화가 엔진의 출력 미 배기성능에 주는 영향을 디젤 단기통 엔진을 이용하여 조사하였다. 엔진 실험 결과를 살펴보면 MK 연소가 산소농도 16%, 분사압 950~1050 bar 사이에서 성공적으로 구현되어 NOx와 Smoke 의 동시 저감이 이루어짐을 확인하였다. 특히 MK 연소 영역에서 분사압이 높아짐에 따라 Smoke의 발생이 억제될 뿐만 아니라 THC 및 CO의 배출은 감소하고 NOx의 배출은 증가함을 알 수 있었다. 또한 분사시기가 TDC와 가까워짐에 따라 THC와 CO의 배출은 증가하는 반면 Smoke와 NOx의 배출은 감소함을 확인하였다. Diesel low temperature combustion (LTC) is the concept where fuel is burned at a low temperature oxidation regime so that NOx and particulate matters (PM) can simultaneously be reduced. There are two ways to realize low temperature combustion in compression ignition engines. One is to supply a large amount of EGR gas combined with advancing fuel injection timing. The other is to use a moderate level of EGR with fuel injection at near TDC which is generally called Modulated kinetics (MK) method. In this study, the latter was used to realize LTC operation in a single cylinder engine and the effects of fuel injection pressure on performance and emissions were evaluated. The engine test results show that MK operations were successfully achieved with 16% O2 concentration and injection pressure of 950 to 1050 bar, and NOx and PM were significantly suppressed at the same time. In addition, with an increase in fuel injection pressure, the levels of smoke, THC and CO were decreased while NOx emissions were increased. Moreover, as fuel injection timing retarded to TDC, more THC and CO emissions were generated and smoke and NOx were decreased.
장재훈 ( Jae Hoon Jang ),이선엽 ( Sun Youp Lee ),이용규 ( Yong Gyu Lee ),오승묵 ( Seung Mook Oh ),이기형 ( Ki Hyung Lee ) 한국분무공학회 2013 한국액체미립화학회지 Vol.18 No.1
Diesel low temperature combustion (LTS) is the concept where fuel is burned at a low temperature oxidation regime so that NOx and particulate matters (PM) can simultaneously be reduced. There are two ways to realize low temperature com-bustion engines. One is to supply a large amount of EGR gas combined with advanced fuel injection timing. The other is to use a moderate level of EGR with fuel injection at near TDC which is generally called Modulated kinetics(MK) method. In this study, the effects of fuel injection pressure on performance and emissions of a single cylinder engine were evaluated using the latter approach. The engine test results show that MK operations were successfully achieved over a range of with 950 to 1050 bar in injection pressure with 16% O₂concentration , and NOx and PM were significantly suppressed at the same time. In addition, with an increase in fuel injection pressure, the levels of smoke, THC and CO were decreased while NOx emissions were increased. Moreover, as fuel injection timing retarded to TDC, more THC and CO emissions were generated, but smoke and Nox were decreased.