• 제목/요약/키워드: SCR(Selective Catalystic Reduction

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소각로의 Nox제어용 SCR시스템의 암모니아 공급량 제어 (Ammonia Flow Control for NOx Reduction in SCR(Selective Catalytic Reduction) System of Refuse Incineration Plant)

  • 김인규;여태경;김상봉
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.30-34
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    • 1997
  • This paper Describe a modelling method for SCR(selective Catalytic reduction) system in refuse incineration plant. We consider the SCR system as a single input single output system. For modelling the SCR system, an auto regressive exogeneous(ARX) modelling method is used. In this case, we should design the white noise input for modelling and put it on the system as an input (.NH/sap2/.), and taken an outlet NOx as an output. From these two relations, we design the ARX model with 45 second delay time and transform to discrete system with 0.5 sampling time. Using the obtained SCR model, we simulate the SCR system to reduce the outlet NOx content by a conventional PID control method.

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소각로의 NOx 제어용 SCR 시스템의 암모니아 공급량제어 (Ammonia flow control for NOx reduction in SCR system of refuse incineration plant)

  • 김인규;여태경;김환성;김상봉
    • 대한기계학회논문집A
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    • 제22권2호
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    • pp.451-457
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    • 1998
  • This paper describes a modelling method for SCR(selective catalystic reduction) system in refuse incineration plant. We consider the SCR system as a single input and single output system. For modelling the SCR system, an auto regressive exogeneous(ARX) modelling method is used. In this case, we should design the white noise input for modelling and put it on the system as an input$(NH_3)$, and take an outlet NOx as an output. From these two relations, we design the ARX model with 45 second delay time and transform to a discrete system with sampling time of 0.5 second. Using the obtained SCR model, we verify that the outlet NOx is deeply related with stoker`s moving in boiler of refuse incineration plant.

SCR 믹서형상에 따른 배기가스와 환원제 혼합 효율에 관한 실험적 연구 (Experimental Study on Mixing Efficiency of Exhaust Gas and Reductant According to SCR Mixer Shape)

  • 최문석
    • 한국산학기술학회논문지
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    • 제22권3호
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    • pp.74-79
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    • 2021
  • 본 연구는 SCR 시스템 내에서 믹서 형상에 따른 배기가스와 요소수의 혼합 효율을 분석하기 위하여 진행되었다. 실험을 위하여 SCR 모사시스템을 제작하였으며, 균일도 측정을 위하여 균일도 측정기를 촉매 위치에 부착하였다. 실험변수는 배기가스의 유량, 온도, 믹서의 타입, 촉매의 거리를 변수로 두어 실험을 진행하였다. 실험결과로는 스월각 분석, 요소수 분포 형태, 균일도 등을 확인하였으며, 모델 A와 B의 스월각 실험결과 모델 A의 스월각이 전체 RPM영역에서 약 7~8도 높게 형성되는 것을 확인할 수 있었다. 요소수 균일도 실험결과 SCR 시스템 내에 믹서가 없는 경우에는 요소수가 한쪽으로 편중되어 있는 것을 확인할 수 있었으며, 믹서 모델 A는 전체적으로 고른 분포를 나타내었고 모델 B는 짧은 거리에 균일도 감지기를 설치하였을 때는 약간의 편중이 있지만 점차 거리가 멀어질수록 안정적인 요소수 분포를 나타내었다. 균일도 목표타겟인 혼합 효율 90%는 모델 A와 모델 B에서 만족할 수 있었으며, 특히 모델 A의 경우가 촉매 위치 10cm에서 이미 90%의 효율을 만족하는 우수한 결과를 나타내었다.

서울지역 대형연소시설에서의 질소산화물 배출계수 산정 (The Evaluation of NOx Emission Factor from Large Combustion Facilities in Seoul)

  • 조기찬;최종욱;박후경;유병태
    • 환경위생공학
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    • 제15권4호
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    • pp.78-83
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    • 2000
  • The emission factor of nitrogen oxides(NOx) was evaluate to clarify the characteristics of NOx emitted from seven large combustion facilities in seoul area. The emission factors of NOx at A-1 and A-2 facilities of internal combustion engine were 66.957kgNOx/ton and 20.913kgNOx/ton, respectively. The emission factor of A-1 facility was higher than that of A-2 facility even same internal combustion engine, because A-1 facility adopted SCR(selective catalystic reactor) for reduction of NOx emission factor of A-2, A-4, and A-7 power generation boiler facilities were 4.300kgNOx/ton, 2.460kgNOx/ton and 1.796kgNOx/ton, respectively. The capacity of A-2 facility was about two times than that of A-4 and A-7. These emission factors were lower than those at facilities in other areas of korea, because of using low NOx burner of power generation boiler. The emission factors of NOx at A-3 and A-6 incinerator facilities were 0.147kgNOx/ton and 0.221kgNOx/ton which were lower than other facilities, respectively, because these facilities incinerate municipal solid waste of low heating value and uwe SCR for reducing NOx concentration.

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