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- 주제어 : Flue gas recirculation(배가스 재순환) (검색결과 7 건)
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FGR 시스템 보일러의 효율에 미치는 재순환 배기의 영향
배명환(Myung-whan Bae),정광호(Kwong-ho Jung),조용수(Yong-soo Cho),김이석(Yi-suk Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The effect of recirculated exhaust gas on boiler efficiency under four kinds of nozzle tip with the different fuel injection amount are experimentally investigated by using an once-through boiler with FGR system. The purpose of this study is to develop the FGR control system for reducing NO<SUB>x</SUB> emissions without deteriorating fuel economy in a boiler. The boiler efficiency is obtained by the experiment and calculation in this study. It is found that the equivalence ratio is gently increased as FGR rates are elevated for a constant fuel injection amount, but the change of equivalence ratio is considerably large as the fuel injection amount is increased for the same FGR rate. Thus one can conclude that boiler efficiencies obtained by the experiment and calculation are rather a little increased with increasing the FGR rate than are decreased, and flue gas temperatures are increased regardless the fuel injection amount as FGR rates are elevated.
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FGR 시스템 동력 플랜트 보일러의 성능 및 배기 배출물에 미치는 재순환 배기의 영향에 관한 연구
배명환(Myung-whan Bae),정광호(Kwong-ho Jung),박성범(Sung-bum Park) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.4
자연순환식 압입 송풍식 수관보일러에 FGR시스템을 설치하여 보일러 부하 및 공기량 댐퍼개도를 파라미터로 해서 FGR률에 따른 성능 및 배기 배출물에 미치는 재순환 배기의 영향을 조사하였다. 본 연구의 목적은 NOx 배출물을 저감시키기 위하여 동력플랜트 보일러에 FGR시스템을 적용하는 것이다. 연소를 활성화시키기 위해 0 ∼ 20%의 연소용 공기를 화염 내에 공급한다. 공기상자 상부에 설치된 2단 연소시스템의 흡입댐퍼를 0° ∼ 90° 사이에서 레버를 조작하여 열면, 버너로 공급되는 연소용 공기가 변화된다. 증발률당의 연료소비율은 FGR률의 증가에 따라 증가 혹은 감소의 명확한 경향을 나타내지 않았고, 동일 공기량 댐퍼개도에서는 FGR률이 증가할수록, 또한, 보일러 부하가 감소할수록 NOx 배출물이 감소되었다. 매연 배출물은 전기 집진기에서 86.7%의 포집효율로 매연이 제거되었기 때문에, 보일러 부하, 공기량 댐퍼 개도 및 FGR률의 운전조건에 관계없이 극소량의 매연이 배출되었다. The effect of recirculated exhaust gas on performance and exhaust emissions with FGR rate are investigated by using a natural circulation, pressurized draft and water tube boiler with FGR system operating at several boiler loads and over fire air damper openings. The purpose of this study is to apply the FGR system to a power plant boiler for reducing NOx emissions. To activate the combustion, the OFA with 0 to 20% is supplied into the flame. When the suction damper of two stage combustion system installed in the upper side of wind box is opened by handling the lever between 0° and 90°, also, the combustion air supplied to burner is changed. It is found that the fuel consumption rate per evaporation rate did not show an obvious tendency to increase or decrease with rising the FGR rate, and NOx emissions at the same OFA damper opening are decreased, as FGR rates are elevated and boiler loads are dropped. While a trace amount of soot is emitted without regard to the operation conditions of boiler load, OFA damper opening and FGR rate, because soot emissions are eliminated by the electrostatic precipitator with a collecting efficiency of 86.7%.
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김현준(Hyeon Jun Kim),최원영(Wonyoung Choi),배수호(Soo Ho Bae),신현동(Hyun Dong Shin) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.10
Oxy-fuel combustion is a reliable way for the reduction of pollutants, the higher combustion efficiency and the separation of carbon dioxide. The review of recent research trends and the prospects of oxy-fuel combustion were presented. The difference in characteristics among oxy-fuel combustion, conventional air combustion, oxy-fuel combustion with flue gas recirculation (FGR) technique was investigated. Recent experiments of oxy-fuel combustion with/without FGR were surveyed in various ways which are optimized burner design, flame characteristics, the soot emission, the radiation effect, the NOx reduction and the corrosion of combustor. Numerical simulation is more important in oxy-fuel combustion because flame temperature is so high that conventional measurement devices have a restricted application. Equilibrium and non-equilibrium chemical reaction mechanisms for oxy-fuel combustion were investigated. Combustion models suitable for the numerical simulation of non-premixed oxy-fuel flame were surveyed.
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0D 모델을 활용한 메탄-수소 혼소에 따른 MILD 연소 및 NOx 배출 특성 해석 연구
안소정,박진제,배윤상,이영재 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.4
Hydrogen with high chemical reactivity and combustion efficiency, is expected to reduce greenhouse gas and CO emission. However, there is a pro- blem of increase in NOx emission due to hydrogen combustion. MILD combus- tion technology has been proposed to resolve NOx emission. In this study, the characteristics of MILD combustion and NOx formation by flue gas recirculation (KV) in CH4-H2 mixture were analyzed and predicted using 0D premixed combus- tion model. The ignition delay time became shorter as the hydrogen co-firing rate increased, and longer as the recirculation rate increased. For NOx emission, EINO decreased as the KV increased, but EINO increased as the hydrogen co- firing rate increased. In particular, EINO was predicted to increase significiently above 80% hydrogen. Through the pathway analysis of NO formation, it was found that the influence of N2O intermediate route and NNH route was enhanced for hydrogen co-firing.
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보일러 연료분사량에 따른 배기 배출물 및 성능에 미치는 FGR률의 영향에 관한 연구
배명환(Myung-whan Bae),류지호(Ji-Ho Ryu),정광호(Kwang-ho Jung) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.2
The purpose of this study is to collect the data for application to the development of flue gas recirculation(FGR) control systems in order to reduce NOX emissions without deteriorating the fuel economy in a boiler. The effects of FGR rate on boiler exhaust emissions and performance under four kinds of nozzle tip with the different fuel injection amount are experimentally investigated by using an once-through boiler with a FGR system. The experimental boiler efficiency is obtained by the effective output heat method. Meanwhile the calculated boiler efficiency is obtained by the heat loss method. It is found that the equivalence ratio is gently increased as the FGR rate is elevated at the constant fuel injection amount, but the change of equivalence ratio is significant when the fuel injection amount is increased at the same FGR rate. Also, one can conclude that the changes of O₂, CO₂, THC and soot emissions are small, but the changes of NOX and CO emissions are large although the equivalence ratio is increased by elevating the FGR rate at the constant fuel injection amount. And the boiler efficiencies obtained by the experiment and calculation are hardly changed although the FGR rate is elevated at a constant fuel injection amount.
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