• 제목/요약/키워드: Nitrogen oxides

검색결과 457건 처리시간 0.028초

공기연료비의 변화에 따른 제어자발화 가솔린기관의 배기 특성 (An Emission Characteristics of a Controlled Auto-Ignition Gasoline Engine according to Variation of the Air-Fuel Ratio)

  • 김홍성
    • 한국기계가공학회지
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    • 제3권2호
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    • pp.79-85
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    • 2004
  • This work treats a controlled auto-ignition (CAI) single cylinder gasoline engine, focusing on the extension of operating conditions. Investigated are the engine emission characteristics under the wide range of operating conditions such as 32 to 63 in the air-fuel ratio, 1000 to 1800 rpm in the engine speed, and 150 to $180^{\circ}C$ in the inlet-air temperature. A controlled auto-ignition gasoline engine can be achieved the ultra lean-burn with self-ignition of gasoline fuel by heating inlet air. It can be achieved that the emission concentrations of carbon monoxide, hydrocarbons and nitrogen oxides had been significantly reduced by CAI combustion compared with conventional spark ignition engines.

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철강산업 용융로의 대기오염물질 배출계수 산정 연구 (A Study on the Emission Factors of Air Pollutants for the Melting Furnaces of the Iron and Steel Industry)

  • 석광설;방선애;홍지형;이석조;김대곤;이대균;허정숙;이은정
    • 한국대기환경학회지
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    • 제20권4호
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    • pp.571-578
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    • 2004
  • The purpose of this study is to estimate of emission factors of the air pollutants for the melting furnaces for the iron and steel industry. The result of this study is able to obtaine the emission factor of particulate matters (PM), sulfur dioxide. nitrogen oxides for melting furnace. The emission factors of each pollutants were as follows : - the emission factor varied between 6.13E-03~6.12E-01 kg/ton for PM -1.59E-01~2.45E+00kg/ton for $SO_2$ - 6.82E-02~6.88E-01 kg/ton for NOx, respectively. Analysis of the differences in the emission factors of ours and U.S. EPA's yielded the following results for the Wilcoxon method : p>0.05. The statistical analysis showed no differences in the our emission factors and U.S. EPA's

추진제 저장수명에 미치는 활성탄소섬유의 영향 (The Effect of Activated Carbon Fiber on the Shelf Life of the Propellants)

  • 윤근식;이종찬
    • 한국신뢰성학회지:신뢰성응용연구
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    • 제5권3호
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    • pp.343-355
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    • 2005
  • As the propellants decompose, they release nitrogen oxides which reduce the shelf life of the propellants by accelerating decomposition rate. The activated carbon fiber was used to extend the shelf life of the propellants that was stockpiled by the military. It is found that the activated carbon fiber adsorbs the nitrogen oxides which were produced by spontaneous reaction of the propellants. As a result, the activated carbon fiber extend the shelf life of the propellants by reducing decomposition rate of the propellants. If 20g of propellant store with 2g of activated carbon fiber, the shelf life of the propellants can be lengthened by 1.4 times.

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중속 디젤기관의 질소산화물 배출특성에 관한 연구 (A Study on the Emission Characteristics of NOx in Medium Speed Diesel Engine)

  • 우석근;윤건식;윤영환
    • Journal of Advanced Marine Engineering and Technology
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    • 제24권4호
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    • pp.526-534
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    • 2000
  • In this study, the characteristics of exhaust emissions in medium speed diesel engine under various operating conditions were investigated through experiments to derive the optimum conditions for minimizing the exhaust emissions, especially, nitrogen oxides. The 355 KW$\times$1200 rpm medium speed diesel engine was intensively examined to investigate the trend of exhaust emissions in case that the parameters affecting combustion conditions such as fuel injection timing, intake air temperature and pressure, engine speed and load were changed. The exhaust emissions for 9 sets of medium speed diesel engine were analyzed in addition. From this study, NOx level could be reduced by 30~50% through the adjustment of retarded fuel injection timing, lowered intake air temperature and increased charging air pressure.

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활성탄소섬유를 이용한 추진제 저장수명 연장 (Propellant Shelf-life Extension by Surface-modified Activated Carbon Fiber)

  • 윤근식;이영석;유승곤
    • Korean Chemical Engineering Research
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    • 제49권4호
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    • pp.443-448
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    • 2011
  • 추진제는 저장 중 발생되는 질소산화물로 인해서 저장수명이 짧아진다. 추진제의 저장수명을 연장할 목적으로 활성탄소섬유로 추진제에서 발생하는 질소산화물을 흡착하였다. 활성탄소섬유에 폐추진제를 첨착시키고 열처리하여 표면을 개질한 결과 비표면적이 약간 감소하였으나 피리딘(pyridine), 피리돈(pyridone) 및 피롤(pyrrol) 등의 질소기능기가 생기는 것을 확인하였다. NO에 대한 흡착시험을 통해서 표면개질한 활성탄소섬유의 흡착능이 개질 이전의 활성탄소섬유에 비해 약 2배 증가하였다. 그리고 추진제에 대한 가속수명시험 결과 표면개질한 활성탄소섬유를 동봉하면 추진제의 저장수명이 약 25% 증가하였다.

파일럿규모의 선택적촉매환원장치에서 디젤유를 이용한 질소산화물 제거 (Reduction of Nitrogen Oxides with Diesel Oil In Pilot Scale SCR(Selective Catalytic Reduction) Process)

  • 이인영;류경옥
    • 대한환경공학회지
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    • 제22권11호
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    • pp.1977-1983
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    • 2000
  • 천연가스를 사용하는 복합화력발전소에서 발생되는 질소산화물(NOx)에 대한 귀금속촉매(Pt/Zeolite)의 활성을 디젤유를 환원제로 사용하여 파일럿 규모의 선택적촉매환원장치(selective catalytic reduction)에서 환원제 주입량, 반응온도, 공간속도에 따라 고찰하였다. 시험결과, 디젤유의 주입량을 증가시킬수록 NOx의 전환율은 증가하였으며 C/N비(C/N비: 배기가스 중에 포함된 NOx의 분자수에 대한 환원제 탄소 원자수의 비) 5.5 이상에서는 일정한 전환율을 유지하였다. NOx 전환율에 대한 반응온도의 영향을 알아본 결과, 온도가 증가함에 따라 NOx의 전환율이 증가하여 $190^{\circ}C$의 온도에서 최고 50%의 전환율을 보였다. 7,200/hr~27,000/hr의 범위에서 NOx 전환율에 대한 공간속도의 영향은, 18,500/hr까지 일정한 전환율을 유지하였으며 그 이상에서는 감소하였다. 이상의 결과에서 디젤유를 환원제로 사용하는 질소산화물 제거를 위한 SCR 공정의 적용 가능성을 확인할 수 있었다.

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