• 제목/요약/키워드: Characteristics of exhaust emission

검색결과 580건 처리시간 0.022초

디젤기관에 있어서 에멀젼연료가 배기배출물 특성에 미치는 영향 (Effect on Characteristics of Exhaust Emissions by Using Emulsified Fuel in Diesel Engine)

  • 조상곤;황상진;유동훈;임재근
    • Journal of Advanced Marine Engineering and Technology
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    • 제31권1호
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    • pp.44-50
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    • 2007
  • Diesel engines have high thermal efficiency, and they have less CO & HC emissions than another engines. while NOx & Soot emissions are very much. compared with exhaust emission standards. However, the limit level is more and more strengthened yearly due to the importance of environmental protection. So, the optimal countermeasures for the reduction of NOx & Soot emissions below limit level are required. Therefore. the author has investigated the effects of emulsified fuel on the characteristics of exhaust emissions. using an four-cycle, four-cylinder and direct injection diesel engine because the using of emulsified fuel among various methods for reducing NOx & Soot emissions is simple in installation low in cost and high in efficiency. The results of investigation according to various operating conditions are as follows : 1) Specific fuel consumption increase maximum 19.8% at low load. but is not affected at full load. 2) In case of emulsion ratio 25%, NOx emission decrease 32% at 75% load. 30% at full load. 3) In case of emulsion ratio 25%, Soot emission decrease 84% at 75% load, 59% at full load.

다양한 주행거리를 가지는 직접분사방식 가솔린 자동차의 배출특성에 관한 연구 (Investigation on the Exhaust Emission Characteristics of GDI Vehicles According to Various Mileage)

  • 김형준;길지훈;강건우;김선문;김정수
    • 한국분무공학회지
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    • 제22권1호
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    • pp.8-12
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    • 2017
  • Recently, manufacture and sales of passenger car with GDI (Gasoline Direct injection) were dramatically increased in Korea. In this study, investigation on the exhaust emission characteristics of GDI vehicles according to mileage were conducted by using chassis dynamometer and emission analyzer. Test cars selected 5 types with G4FD engine (1600 cc) and emissions of total 14 vehicles analyzed. Measurement and evaluation on emissions (CO, NOx, NMOG, $CO_2$) characteristics of GDI vehicles with mileages from 40,000 to 80,000 km in certification driving cycle (CVS-75) were carried out in this study. It is revealed that emission results of all test cars shows below emission standard, NMOG emission value of about 80,000 km doubled that of 40,000 km and emission increased by accumulated mileage. Also, increasing pattern of NOx emissions shows when the vehicle mileages was increased and $CO_2$ emission increasing trend obviously do not show according to mileages.

초음파 수첨가 연소에 의한 석유 홴 히터의 배기가스 특성 고찰 (An Investigation of Combustion Emission Characteristics of Kerosene Fan Heater with Addition of Water Droplets by Ultrasonic Atomizer)

  • 김장권;정규조
    • 동력기계공학회지
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    • 제3권3호
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    • pp.44-53
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    • 1999
  • This study is concerned with the emission characteristics of kerosene fan heater, which is burned with kerosene and water droplets simultaneously in the burner, in order to prohibit the emissions of harmful exhaust gas and reduce smell caused by incomplete combustion, and the addition of water droplets to the conventional kerosene fan heater was performed by ultrasonic atomizer. For the investigation of this study, the measurement of exhaust gas components and exhaust gas temperature was carried out by using an automatic combustion gas analyser and $NO_x$ analyser, and the measurement of consumption weight of oil and water was obtained by using electric digital balance. Consequently, according as the water percent weight ratio of about $21{\sim}23%$ was supplied for this study, it was found that the combustion-generated $NO_x$ and CO emissions were reduced very largely, but the emissions of $O_2\;and\;CO_2$ and the temperature of exhaust gas were not changed.

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산화촉매에 의한 대형디젤엔진의 배출가스 정화특성 -실차실험을 중심으로- (Characteristics of Exhaust Emission Reduction of Heavy Duty Diesel Engine by Oxidation Catalyst - Engine Bench Test -)

  • 조강래;김희강
    • 한국대기환경학회지
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    • 제14권5호
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    • pp.443-454
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    • 1998
  • Pt-V catalytic converter was installed on a heavy duty diesel engine and the characteristics of the emission reduction were tested using a engine dynamometer at various operating conditions. The emission reduction performance of Pt-V catalyst was also compared with that of a commercialized Pt catalyst currently being used in some of the heavy duty diesel engines in advanced countries. The effects of Pt-V and Pt catalysts on regulated and unregulated emissions were investigated using a 0.05 weight percent sulfur content fuel with an engine dynamometer Experiments for gaseous emissions (CO, HC and aldehyde) as well as particulate emissions (TPM, SOF and sulfate) have been conducted at several operating conditions such as T-7 mode, D-13 mode and S-13 mode before and after installing the Pt-V and Pt catalysts in the exhaust system. The emission reduction performance of Pt catalyst with respect to CO, HC, SOF, PAHs and aldehyde was found to be a little higher than that of Pt-V catalyst, but the Pt catalyst showed innate disadvantage of causing an increase of PM due to the sulfate formation via high SO2 conversion at high exhaust temperature, especially above 45$0^{\circ}C$.

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이중관 배기메니폴드의 HC저감효과 및 열특성에 관한 연구 (A Study on the Reduction of HC and Heat Characteristics of the Dual Pipe Exhaust Manifold)

  • 박경석;허형석
    • 한국자동차공학회논문집
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    • 제9권6호
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    • pp.103-111
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    • 2001
  • During cold-start period, the reduction of exhaust emissions is a challenging task. To decrease harmful gaseous substances such as HC, it is necessary to realize a fast catalyst warm-up. In this study, the performance of dual pipe exhaust system have been carried out through different test mode. From measurement of gas temperature and HC concentration, the following conclusions were derived ; 1) Compared with single pipe, dual pipe exhaust system remarkably increase temperature of exhaust gas going through M.C.C(Main Catalytic Converter). 2) W.C.C.(Warm-up Catalytic Converter) also decreases HC emission. To reduce HC emission, it is helpful to use W.C.C. as well as dual pipe exhaust system. 3) Using finite element method, it is shown that inner parts have much higher distribution of temperature than outer parts.

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배기구성요소가 SI기관의 성능에 미치는 영향 (The Effect of Exhaust System Components on the Sl Engine Performance)

  • 박경석;박세종;손성만
    • 한국정밀공학회지
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    • 제22권6호
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    • pp.192-198
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    • 2005
  • Recently, Automobile manufacturers regarding stability, economic environmental-friendly problems by the development of automobile. This reason is increasingly strict environmental regulations to lower fuel consumption and reduce emission. Designing more efficient and low emission control exhaust system results in more efficient Performance, reduced back Pressure and higher convert efficiency. Also to reduce the noise and the vibration of the automobile. According to develop variable type muffler, dual muffler and active intelligence exhaust system unit. Improvement in engine performance and fuel consumption rate, higher conversion efficiency demand information of pressure fraction and heat characteristics. To be able to determine these factor fur we experiment on each case of exhaust system unit. In this study, how back pressure is distributed in flow-through in exhaust system and how to design exhaust system flexibleness, efficiency, lower back pressure and optimal performance. This study furnish basic data for engineers, technicians.

수소기관에서의 배기가스에 관한 연구 (Study on Emission Characteristics in a Hydrogen-fueled Engine)

  • 조웅래;최경호;배석천
    • 한국수소및신에너지학회논문집
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    • 제13권1호
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    • pp.83-89
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    • 2002
  • The goal of this research is to understand the NOx emission in direct injected diesel engine with premixed hydrogen fuel. Hydrogen fuel was supplied into the test engine through the intake pipe. Amount of hydrogen-supplemented fuel was 70 % basis on heating value of the total input fuel. The effects of intake air temperature and exhaust gas recirculation(EGR) on NOx emission were studied. The intake air temperatures were varied from $23^{\circ}C$ to $0^{\circ}C$ by using liquid nitrogen. Also, the exhaust gas was recirculated to the intake manifold and the amount of exhaust gas was controlled by the valve. The major conclusions of this work include: ( i ) nitrogen concentrations in the intake pipe were increased by 30% and cylinder gas temperature was decreased by 24% as the intake air temperature were changed from $23^{\circ}C$ to $0^{\circ}C$; ( ii ) NOx emission per unit heating value of supplied fuel was decreased by 45% with same decrease of intake air temperature; and (iii) NOx emission was decreased by 77% with 30% of EGR ratio. Therefore, it may be concluded that EGR is effective method to lower NOx emission in hydrogen fueled engine.

가솔린엔진의 냉시동시 촉매변환기 위치변화에 따른 배기가스특성에 관한 실험적 연구 (An Experimental Study on the Characteristics of Gasline Engine Exhaust-gas by Changing Catalytic Converter Position for Cold-starting)

  • 이해철;석동현;윤준규;차경옥
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.945-949
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    • 2001
  • This study is an experimental study on the characteristics of emission by changing catalytic converter position for cold-start. The measurements are done a changing of the distance between exhaust manifold and catalytic converter. It measured temperature of exhaust manifold, before and after catalytic converter at each position of experimental condition. and measured the characteristics of emission which is HC, CO, $CO_{2}$ and lambda at each position of experimental condition. The results show a few advantage about reduction of HC and CO as catalytic converter's temperature is raised quickly as closed exhaust manifold. but $CO_{2}$ has not the same trend of HC and CO. From measurement value of lambda, reduction effects of $NO_{x}$ are known a few advantage as increase of the distance between exhaust manifold and catalytic converter.

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액상 분사 LPG 엔진 성능 및 차량 배기 배출물 특성에 관한 연구 (LPLi Engine Performance and Vehicle Exhaust Emission Characteristics)

  • 임종훈;명차리;박심수;양승주
    • 한국자동차공학회논문집
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    • 제11권4호
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    • pp.15-21
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    • 2003
  • LPG is considered as one of the most prominent alternative automotive fuels in worldwide. However, conventional mixer system can not meet the emission regulations as the mileage accumulation increased. Recently, much attention is focused on the development of LPG liquid injection fuel systems to increase the engine performance and reduce the exhaust emissions. This study evaluates the LPLi(Liquid Phase LPG injection) engine performance and exhaust emission characteristics using a 3.0 liter LPG engine. The fuel supply system and engine management system were changed from FBM into LPLi to control the precise mixture ratio and optimized spark advance.

직접분사식 가솔린엔진에서 운전조건에 따른 바이오에탄올의 연소 및 배기배출물 특성 (Effect of Engine Operating Conditions on Combustion and Exhaust Emission Characteristics of a Gasoline Direct Injection(GDI) Engine Fueled with Bio-ethanol)

  • 윤승현;박수한
    • 대한기계학회논문집B
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    • 제39권7호
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    • pp.609-615
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    • 2015
  • 본 연구는 직접분사식 가솔린엔진에서 공기 과잉률 및 바이오에탄올-가솔린 혼합연료의 혼합비에 따른 연소특성과 배기배출물 특성을 실험적으로 규명한 것이다. 다양한 공기 과잉률 및 혼합비 조건에서 실험을 수행하였으며, 연소실 압력, 열발생률, 연료소비율 등을 통해 연소특성을 분석하였으며, 배기배출물 특성은 미연탄화수소(HC), 일산화탄소(CO), 질소산화물($NO_x$) 분석을 통해 확인하였다. 혼합연료의 실험결과는 100% 가솔린 및 바이오에탄올 실험결과와 비교하였다. 실험결과 최고연소압력과 열발생률, 제동연료소비율은 혼합비의 증가에 따라 증가하였으며, CO, HC, $NO_x$와 같은 배기배출물은 바이오 에탄올 혼합비율이 증가함에 따라 감소하였다. 혼합연료의 배기배출물 수준은 가솔린 보다 낮게 나타났다.