• 제목/요약/키워드: fuel reduction

검색결과 1,778건 처리시간 0.034초

가스화 연료 연소시 단계적 연료주입 기술에 의한 질소산화물 저감 (Reduction of Nitrogen Oxide by Fuel Staged Technology on the Combustion of Gasification Fuel)

  • 채종성;조선희;전영남
    • 한국대기환경학회지
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    • 제14권2호
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    • pp.107-116
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    • 1998
  • Coal gasification fuel has generally a lower calorific values than natural gas and also contains ammonia which is a main source of fuel NOx. Such a fuel is in need of the advanced technologies for the NOx reduction with higher combustion efficiency. Therefore fuel staged combustion was investigated for the fuel NOx control using a bench scale gas combustoi for the fuel NOx control. Parametric screening studies were performed with the variation of air ratio, retention length and reburning fuel. The NOx reduction efficiency was increased with an increase of total air ratio having optimum reburning air ratio differently, The Increased retention length of the reburning zone was preferable for NOx reduction. Hydrocarbonic reburning fuels like propane and butane were more effective for the NOx reduction efficiency than hydrogen fuel. The NOx concentration at exit was linearly increased according to the fuel-N the fuel.

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Reduction of Nitrogen Oxides from Fuel Nitrogen in New Fuelling System

  • 전영남;채재우
    • Bulletin of the Korean Chemical Society
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    • 제17권10호
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    • pp.885-892
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    • 1996
  • The effects of NOx reduction by advanced fuel staging in a small scale combustor (6.6 kWT) have been investigated using propane gas flames laden with ammonia as fuel-nitrogen. The variables which had the greatest influence on NOx reduction were temperature, reducing stoichiometry (relate to main combustion zone stoichiometry, air fraction and reburning fuel fraction) and residence time of reducing zone. NOx reduction was best at the reburning zone temperature of above 1,000 ℃ and reburning zone stoichiometry was 0.85. In terms of residence time of the reburning zone, NOx reduction was effective when burnout air was injected at the point where the reburning zone had been already established. In the advanced fuel staging NOx reduction was relatively large at the burning of higher Fuel-N concentration in the fuel. Under optimum reburning conditions, fuel nitrogen content had a relatively minor impact on reburning efficiency.

사이드스커트와 보트테일을 이용한 대형화물차량의 연비개선 효과 및 온실가스 감축량 추정 (Estimation of GHG Emissions Reduction and Fuel Economy Improvement of Heavy-Duty Trucks by Using Side Skirt and Boat Tail)

  • 허철행;윤병규;김대욱
    • 한국기후변화학회지
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    • 제7권2호
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    • pp.177-184
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    • 2016
  • Recently, the need for technology development of commercial vehicle fuel consumption has emerged. Fuel economy improvement of transport equipment and transportation efficiency, and increasing attention to the logistics cost reduction measures. Increasing attention to the logistics cost reduction measures by fuel economy improvement of transport equipment and transportation efficiency. In this study, we have installed aerodynamic reduction device (side skirt, boat tail) to 14.5 ton cargo trucks and 45 ft tractor-trailers. And the fuel consumption was compared installed before and after. Fuel economy assessment for the aerodynamic reduction value device was tested by modifying the SAE J1321 Joint TMC/SAE Fuel Consumption Test Procedure - Type II test in according domestic situation. Greenhouse gas reductions were calculated in accordance with the scenario, including fuel consumption test results. When the 14.5 ton cargo trucks has been equipped with side skirts and boat tail, it confirmed the improvement in fuel efficiency of 4.72%. One Heavy-duty truck's the annual greenhouse gas reductions value are $6.86ton\;CO_2\;eq$. And if applying the technology to more than 50% of registered 15 ton trucks, greenhouse gas reductions are calculated as $686,826ton\;CO_2\;eq./yr$.

직접 분사식 디젤기관에서 Dimethoxy Methane과 Cooled EGR방법을 이용한 Smoke와 NOx의 동시저감 (Simultaneous Reduction of Smoke and NOx by Dimethoxy Methane and Cooled EGR Method in a DI Diesel Engine)

  • 최승훈;오영택;권규식
    • 한국자동차공학회논문집
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    • 제12권5호
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    • pp.66-72
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    • 2004
  • In this study, the effects of oxygen component in fuel and exhaust gas recirculation(EGR) method on the exhaust emissions has been investigated for a D.I. diesel engine. It was tested to estimate change of exhaust emission characteristics for the commercial diesel fuel and oxygenate blended fuel which has five kinds of blending ratio. Dimethoxy methane(DMM) contains oxygen component 42.5% in itself, and it is a kind of effective oxygenated fuel for reduction of smoke emission. It was affirmed that smoke emission was decreased with increasing of DMM blending ratio. But, NOx emission was increased compared with commercial diesel fuel. It was needed a NOx reduction counterplan that EGR method was used as a countermeasure for NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with DMM blended fuel and cooled EGR method(1015%).

PWR 사용후핵연료 처리를 위한 금속전환공정 개발 (Development of an Oxide Reduction Process for the Treatment of PWR Spent Fuel)

  • 허진목;홍순석;정상문;이한수
    • 방사성폐기물학회지
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    • 제8권1호
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    • pp.77-84
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    • 2010
  • 상용원자로에서 발생하는 산화물 사용후핵연료의 부피감용과 재활용을 위하여 산화물을 금속으로 환원시키는 공정에 대한 연구가 수행되어 왔다. 다양한 환원법 중에서, 한국원자력연구원은 LiCl-$Li_2O$ 용융염을 반응매질로 사용하는 전해환원공정을 현재 개발 중이다. 파이로 공정의 전단부에 해당하는 전해환원 공정은 PWR 산화물 연료 주기를 소듐냉각 고속로의 금속연료 주기에 연결시켜 준다. 이 논문은 금속전환 공정을 개발/개선하고, 용량 증대를 수행한 한국원자력연구원의 노력을 요약한다.

연료분사정보 표시장치를 통한 자동차 연비향상 효과에 대한 실험적 연구 (A Study on Reduction of Fuel Consumption by Displaying Fuel Injection Data for Drivers)

  • 고광호
    • 한국자동차공학회논문집
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    • 제18권4호
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    • pp.115-120
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    • 2010
  • The reduction rate of fuel consumption by showing the fuel injection data for driver was measured in this study. The fuel injection data are composed of injection period, real time fuel economy and average fuel economy. The fuel consumption was measured by processing the voltage signal of injector and driven distance by GPS sensor. The fuel consumption was reduced by driving more carefully, i.e driving more steady without sudden acceleration and deceleration watching these fuel injection data. The reduction rate was up to 37% and the rate increased as the driver is customed to this driving pattern.

매연과 NOx의 동기저감을 위한 Dimethoxy Methane과 EGR방법의 적용에 관한 연구 (A Study on Application of Dimethoxy Methane and EGR Method for Simultaneous Reduction of Smoke and NOx Emission)

  • 최승훈;오영택;황윤택;송기홍
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 추계학술대회
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    • pp.448-453
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    • 2003
  • In this study, the effects of oxygen component in fuel and exhaust gas recirculation(EGR) method on the exhaust emissions has been investigated for a D.I. diesel engine. It was tested to estimate change of exhaust emission characteristics for the commercial diesel fuel and oxygenate blended fuel which has five kinds of blending ratio. Dimethoxy methane(DMM) contains oxygen component 42.5% in itself. and it is a kind of effective oxygenated fuel for reduction of smoke emission. It was affirmed that smoke emission was decreased with increasing of DMM blending ratio. But, NOx emission was increased compared with commercial diesel fuel. It was needed a NOx reduction countermeasure that EGR method was used as a countermeasure for NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with DMM blended fuel and cooled EGR method($10{\sim}15%$).

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농용 디젤기관에서 매연과 NOx의 동시저감에 관한 실험적 연구 (An Experimental Study on Simultaneous Reduction of Smoke and NOx in a Agricultural Diesel Engine)

  • 최승훈;오영택
    • 한국자동차공학회논문집
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    • 제11권3호
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    • pp.85-91
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    • 2003
  • In this study, the potential possibility of oxygenated fuel such as Methyl tertiary butyl ether (MTBE) was investigated for the sake of exhausted smoke reduction from diesel engine. MTBE has been used as a fuel additive blended into unleaded gasoline to improve octane number, but the study of application for diesel engine was incomplete. Because MTBE includes oxygen content approximately 18%, it is a kind of oxygenated fuel that the smoke emission of MTBE is reduced remarkably compared with commercial diesel fuel. But, the NOx emission of MTBE blended fuel is increased compared with commercial diesel fuel. And, it was tried to analyze not only total hydrocarbon but individual hydrocarbon components from $C_1$ to $C_6$ in exhaust gas using gas chromatography to seek the reason for remarkable reduction of smoke emission. Individual hydrocarbons($C_1$~$C_6$) as well as total hydrocarbon of oxygenated fuel are reduced remarkably compared with diesel fuel. And, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission has been investigated, too. It was found that simultaneous reduction of smoke and NOx was achieved with oxygenated fuel and cooled EGR method.

모의 사용후 핵연료를 이용한 질화물 핵연료 소결체 제조 (Fabrication of Nitride Fuel Pellets by Using Simulated Spent Nuclear Fuel)

  • 류호진;이재원;이영우;이정원;박근일
    • 한국분말재료학회지
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    • 제15권2호
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    • pp.87-94
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    • 2008
  • In order to investigate a nitriding process of spent oxide fuel and the subsequent change in thermal properties after nitriding, simulated spent fuel powder was converted into a nitride pellet with simulated fission product elements through a carbothermic reduction process. Nitriding rate of simulated spent fuel was decreased with increasing of the amount of fission products. Contents of Ba and Sr in simulated spent fuel were decreased after the carbothermic reduction process. The thermal conductivity of the nitride pellet was decreased by an addition of fission product element but was higher than that of the oxide fuel containing fission product elements.

AN EXPERIMENTAL STUDY ON AN ELECTROCHEMICAL REDUCTION OF AN OXIDE MIXTURE IN THE ADVANCED SPENT-FUEL CONDITIONING PROCESS

  • Jeong, Sang-Mun;Park, Byung-Heung;Hur, Jin-Mok;Seo, Chung-Seok;Lee, Han-Soo;Song, Kee-Chan
    • Nuclear Engineering and Technology
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    • 제42권2호
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    • pp.183-192
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    • 2010
  • An electrochemical reduction of a mixture of metal oxides was conducted in a LiCl molten salt containing 3 wt% $Li_2O$ at $650^{\circ}C$. The oxide reduction was carried out by applying a current to an electrolysis cell, and the $Li_2O$ concentration was analyzed during each run. The concentration of $Li_2O$ in the electrolyte bulk phase gradually decreases according to Faraday's law due to a slow diffusion of the $O^{2-}$ ions. A hindrance effect of the unreduced metal oxides was observed for the reduction of the uranium oxide. Cs, Sr, and Ba of high heat-load fission products were diffused into and accumulated in the salt phase as predicted with thermodynamic consideration.