• 제목/요약/키워드: NOx and Soot Emissions

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HCCI 디젤엔진의 배기특성에 미치는 예혼합 연료의 영향 (Effect of Premixed Fuels Charge on Exhaust Emission Characteristics of HCCI Diesel Engine)

  • 김명윤;윤영훈;황석준;김대식;이창식
    • 한국자동차공학회논문집
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    • 제13권4호
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    • pp.182-189
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    • 2005
  • In order to investigate the effect of premixed gasoline, diesel fuel, and n-heptane charges on the combustion and exhaust emission characteristics in a direct injection (DI) diesel engine, the experimental studies are performed. The premixed fuels are injected into the premixing chamber that installed upstream of the intake port in order to minimize the inhomogeneity effect of premixed charge. The injection nozzle for directly injected fuel is equipped in the center of the combustion chamber. The air temperature control system is equipped in the intake manifold to examine the effect of air temperature. The experimental results of this study show premixing fuel is effective method to reduce the NOx and soot emissions of diesel engine. NOx emissions are linearly decreased with increasing premixed ratio for the three kinds of premixed fuels. The heating of intake air $(80^{\circ}C)$ reduced the deterioration of BSFC in high premixed ratio, because it promotes evaporation of premixed diesel droplet in the premixing chamber.

물혼합 연료 및 EGR의 조합에 의한 디젤기관의 질소산화물과 매연미립자 동시저감 기술에 관한 연구 (Technology for Reducing NOx and Soot Particulate using EGR with Water Emulsified Fuel in Diesel Engines)

  • 박권하;박태인;김기형
    • Journal of Advanced Marine Engineering and Technology
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    • 제21권4호
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    • pp.356-363
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    • 1997
  • Many research works have been carried out to investigate the factors governing the performance of diesel engine. The area of the study has been focused on reducing both of NOx and smoke because of many difficulties to reduce them simultaneously in diesel engines. One of the efforts is an application of EGR technology to reduce NOx emission, which is very effective, but increases other emissions and makes fuel economy worse. In order to solve the problem, EGR is employed with water emulsified fuel and tested in this paper. Emulsified fuel is produced by centrifugal mixer and the amount of water is controlled by water injector and pulse generator, and EGR rate is controlled with 6-step control valve. The chamber pressure, fuel consumption and emissions are measured with various values of both EGR and water mixing rate, The results show that NOx emission is reduced much rather and smoke is also reduced simultaneously.

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다공 세라믹 액체 연료 연소기의 연소 특성에 관한 실험적 연구 (Experimental Study on Combustion Characteristics of Porous Ceramic Liquid Fuel Combustor)

  • 정경현;임인권
    • 한국연소학회지
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    • 제4권1호
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    • pp.85-93
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    • 1999
  • Experimental study on a porous ceramic liquid fuel combustor is performed. Compact burner with low pollutant emission and high combustion efficiency is realized through the use of porous ceramic materials of high porosities. The use of porous ceramic materials in burner material results in rapid vaporization of liquid fuel and enhancement in mixing process, and thus nearly premixed combustion of liquid fuel is achieved instead of diffusion and partially premixed combustion method, which is often used and apt to produce high pollutant emissions such as CO, NOx and soot. With this enhanced vaporization and premixing method of liquid fuel vapor and air, it is found that enhanced combustion process with intense radiation output and better emission characteristics in NOx, CO and soot emission, compared to other conventional liquid fuel burning method, are possible.

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디젤기관의 연료분사시기가 배기배출물 특성에 미치는 영향 (Effects of Fuel Injection Timing on Exhaust Emissions Characteristics in Diesel Engine)

  • 임재근;최순열
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2001년도 추계학술대회 논문집(Proceeding of the KOSME 2001 Autumn Annual Meeting)
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    • pp.50-56
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    • 2001
  • A study on the exhaust emissions of diesel engine with various fuel injection timing is peformed experimentally. In this paper, fuel injection timing is changed from BTDC $14^{\circ}$ to $20^{\circ}$ by $2^{\circ}$ intervals, the experiments are performed at engine speed 1800rpm and from load 25% to 100% by 25% intervals, and main measured parameters are fuel consumption rate, Soot, NOx. HC and CO emissions etc. The obtained conclusions are as follows (1) Specific fuel consumption is indicated the least value at BTDC $18^{\circ}$ of fuel injection timing and it is increased in case of leading the injection timing. (2) Soot emission is decreased in case of leading fuel injection timing and it is increased in the form of convex downwards with increasing the load. (3) $NO_x$ emission is increased in case of leading fuel injection timing and it is increased in the form of straight line nearly with increasing the load. (4) HC and CO emissions are decreased in case of leading fuel injection timing and they are changed in the form of convex downwards with increasing the load.

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차량화재 안전설계를 위한 휘발유/에탄올 혼합연료의 연소생성물 배출 특성 (Emission Characteristics of Gasoline/ethanol Mixed Fuels for Vehicle Fire Safety Design)

  • 김신우;이의주
    • 한국안전학회지
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    • 제34권1호
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    • pp.27-33
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    • 2019
  • Combustion characteristics of gasoline/ethanol fuel were investigated both numerically and experimentally for vehicle fire safety. The numerical simulation was performed on the well-stirred reactor (WSR) to simulate the homogeneous gasoline engine and to clarify the effect of ethanol addition in the gasoline fuel. The simulating cases with three independent variables, i.e. ethanol mole fraction, equivalence ratio and residence time, were designed to predict and optimized systematically based on the response surface method (RSM). The results of stoichiometric gasoline surrogate show that the auto-ignition temperature increases but NOx yields decrease with increasing ethanol mole fraction. This implies that the bioethanol added gasoline is an eco-friendly fuel on engine running condition. However, unburned hydrocarbon is increased dramatically with increasing ethanol content, which results from the incomplete combustion and hence need to adjust combustion itself rather than an after-treatment system. For more tangible understanding of gasoline/ethanol fuel on pollutant emissions, experimental measurements of combustion products were performed in gasoline/ethanol pool fires in the cup burner. The results show that soot yield by gravimetric sampling was decreased dramatically as ethanol was added, but NOx emission was almost comparable regardless of ethanol mole fraction. For soot morphology by TEM sampling, the incipient soot such as a liquid like PAHs was observed clearly on the soot of higher ethanol containing gasoline, and the soot might be matured under the undiluted gasoline fuel.

선박용 디젤 엔진에서 Pilot 분사에 대한 연소 특성 연구 (A Study on Characteristics of Combustion with Pilot Injection in a Marine Diesel Engine)

  • 이병화;배명직;한동식;전충환;장영준;송주헌
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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    • pp.3007-3012
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    • 2008
  • Multidimensional simulation has been carried out to be clear the role of initial combustion in a marine diesel engines on reduction of NOx and soot emissions by different pilot injection condition. Pilot injection can shorten the ignition delay, thus it reduces the premixed combustion phase. Since most NOx is formed during premixed combustion, pilot injections is one of reliable strategies to reduce the NOx. The formation of NOx consists of that formed by pilot injection and that formed by main injection. The result explains that 25-3-75 among the pilot injection conditions is effective to reduce the NOx, due to optimal combination pilot injection with main injection. The purpose of this study is to explain the characteristics of combustion with pilot injection of the marine diesel engine on reduction of exhaust emissions by examining the combustion process in a cylinder and to explore the formation mechanism of NOx between pilot injection and main injection.

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The Role of Large Scale Mixing and Radiation in the Scaling of NOx Emissions From Unconfined Flames

  • Newbold, Greg J.R.;Nathan, Graham J.;Nobes, David S.;Turns, Stephen R.
    • 한국연소학회지
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    • 제7권1호
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    • pp.8-14
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    • 2002
  • Measurements of global emissions, flame radiation and flame dimensions are presented for unconfined turbulent-jet and precessing-jet diffusion flames. Precessing jet flames are characterised by increases in global flame radiation and global flame residence time for methane and propane fuels, however a strong dependency of the NOx emission indices on the fuel type exists. The fuel type dependence is considered to be because soot radiation is more effective than gas-radiation at reducing global flame temperatures relative to adiabatic flame temperatures and reducing the NO production rate.

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직접분사식 디젤기관에서 연료소비율 및 배기배출물 특성에 미치는 바이오디젤유의 영향;유채유를 중심으로 (Effects of Biodiesel Fuel on Characteristics of Specific Fuel Consumption and Exhaust Emissions in DJ Diesel Engine;Using Rape Oil)

  • 임재근;최순열;조상곤
    • 해양환경안전학회:학술대회논문집
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    • 해양환경안전학회 2007년도 추계학술발표회
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    • pp.133-137
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    • 2007
  • An experimental study is conducted to evaluate and compare the use of BiodieseDI Fuel supplements at blend ratio of 10/90(BDF10) and 20/80(BDF20), in four stroke, direct injection diesel engine located at the authors' laboratory. especially this Biodiesel is produced from Rape oil at the authors' laboratory. The tests are conducted using each of the above fuel blends, in the engine working at a speed of 1800rpm and at a various loads. In each test, specific fuel consumption, exhaust emissions such as nitrogen oxides(NOx), carbon monoxide(CO) and Soot are measured. The results of investigation at various operating conditions are as follows (1) Specific fuel consumption is increased average 1.52%, maximum 1.84% at load 25% in case of BDF10, and average 1.98%, maximum 2.80% at load 25% in case of BDF20. (2) CO emission is decreased average 5.14%, maximum 6.09% at load 0% in case of BDF10, and average 7.75%, maximum 9.13% at load 0% in case of BDF 20. (3) NOx emission is increased average 2.97%, maximum 3.74% at load 0% in case of BDF10, and average 3.84%, maximum 4.67% at load 0% in case of BDF20. (4) Soot emission is decreased average 9.36%, maximum 10.85% at load 75% in case of BDF10, and average 11.99%, maximum 13.95% at load 75% in case of BDF20.

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연료성상에 따른 디젤엔진의 질소산화물 및 스모크 배출특성에 관한 연구 (A Study on the Characteristics of NOx and Smoke for Diesel Engine by Fuel)

  • 남정길;이돈출;한원희;박정대;강대선
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2006년도 전기학술대회논문집
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    • pp.145-146
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    • 2006
  • The main objective of this research is to develop a system which will provide a more efficient fuel saying measure for the current marine products industry situation caused by the increased cost of oil. For that function, the developed system has been verified using the medium of blending oil known as the MF 30 class. As a result, MF 30 was confirmed meeting the International Standard for NOx emissions and content of Sulfur. Oil composition and soot level analysis showed that it is acceptable to use MF 30 class in condition of proper engine running operation and pre-refinery treatment.

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부분부하에서 커먼레일 과급 디젤엔진의 VGT와 EGR 제어가 배출물에 미치는 영향 (The Effect of Control of the VGT and EGR in a Turbocharged Common-Rail Diesel Engine on Emissions under Partial Loads Conditions)

  • 정수진;정재우;강정호;강우
    • 한국자동차공학회논문집
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    • 제15권6호
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    • pp.151-158
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    • 2007
  • The static and dynamic behaviour of VGT and EGR systems has a significant impact on overall engine performance, fuel economy and exhaust emissions. This is because they define the state and composition of the air charge entering the engine. This work focused on the effect of the aperture ratio of VGT and EGR on the emission and flow characteristics under partial loads conditions. The investigation carried out using 2 liter PCCI 4 cylinder diesel engine with VGT and EGR. The result of this study shows that smoke increases with increasing EGR rate and NOx decreases with increasing EGR rate. It was also found that the residual gas contents greatly impact on soot emission under partial load condition. Finally, it can be concluded that VGT and EGR aperture ratio can greatly impact not only on soot and NOx but also air charging.