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난류 부분예혼합화염과 로테이팅 아크 플라즈마를 이용한 난연성 유증기의 연소처리
안태국(Taekook Ahn),이대훈(Daehoon Lee),박선호(Sunho Park) 한국연소학회 2017 한국연소학회지 Vol.22 No.1
Large-scale fuel tanks emit massive amount of hardly-combustible VOC mixtures which are light hydrocarbon species in dilution with nitrogen and carbon dioxide. We have developed a lab-scale burner to combust those VOC mixtures by use of a turbulent partially-premixed flame as a pilot flame. For a higher HC treatment ratio, the mixture gases were reformed by a rotating arc plasma device. The results showed that the nitrogen mole fraction and the injecting speed of the VOC mixture influence on the performance of the burner. It was also found that the size of the pilot flame and the power supplied to the plasma device determine the overall HC treatment ratio and the concentrations of CO and NOx in the exhaust gas.
안태국(Taekook Ahn),남연우(Younwoo Nam),이원남(Wonnam Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
이중으로 형성되는 LPG 희박 예혼합화염의 혼합기 공급의 성층화에 따른 희박 예혼합화염의 날림과 안정성에 대한 실험을 수행하여 다음을 알 수 있었다. - 희박 예혼합화염은 화염 자체적으로는 확산화염과 과농 예혼합화염에 비해 안정성이 많이 떨어진다. 하지만 희박화염 내부에 공간이 있을 경우에는 그렇지 않은 경우에 비해 상대적으로 빠른 출구속도에서도 화염이 안정적으로 유지되었다. 이는 화염 내부의 공간에 재순환 영역이 만들어지면서 화염이 안정적으로 유지될 수 있기 때문이다. - 외부화염의 내부에 공기를 공급하면 재순환유동을 억제하여 화염이 날아간다. 그러나 내부에 외부화염과 동일한 예혼합기를 공급하여 희박예혼합화염을 만들어주면 외부화염만 존재하였을 때보다 안정성이 떨어지지만 어느 정도 화염 화염의 안정성을 유지할 수 있었다. 이 때 화염의 열방출 효과보다 재순환영역이 화염의 안정성에 더 큰 영향을 주는 것으로 관찰되었다. - 화염 내부나 외부에 재순환영역이 없는 경우에도 열방출 효과로 인해 화염이 안정화 될 수 있다는 것을 확인할 수 있었다. The blow-off characteristics of lean premixed flames were experimentally investigated using a concentric co-flow burner. In order to produce the stratified flow the fuel/air mixture flow rates were individually controlled for inner and outer nozzles. When fuel/air mixture was supplied through the outer nozzle only, the blow-off process was suppressed by the recirculation motion at the center location and the transition from a laminar premixed flame to a turbulent premixed flame was observed for the exit velocity of 2.0 ㎧ or higher with equivalence ratio 0.9. However, blow-off occurred for the velocity higher than 1.2 ㎧ with equivalence ratio 0.75. The premixed flame established at the inner nozzle could weaken the effect of recirculation while help to hold the outer flame with heat release effect.
안태국(Taekook Ahn),이원남(Wonnam Lee) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
The stability of inert gas-diluted flames has been experimentally studied. Adding inert gases to a diffusion flame, which used to be very stable without dilution, makes a flame unstable. The existence of an over-ventilated pilot diffusion flame inside of a diluted diffusion flame provides an very effective tool to maintain a flame stable. The thermo-chemical effects of a pilot diffusion flame are considered the main reason for the enhancement of flame stabilization.
아르곤이온 레이저를 이용한 확산화염 내 PAH의 LIF 신호 측정에 LII 신호가 미치는 영향
안태국(Taekook Ahn),배승만(Seungman Bae),이원남(Wonnam Lee),박선호(Sunho Park) 한국연소학회 2018 한국연소학회지 Vol.23 No.1
The effect of LII interference on the measurement of LIF signals from PAH in a diffusion flame has been investigated. Argon-ion laser at 488 nm was vertically or horizontally polarized, and irradiated to the centerline of the flame at varying flame height. Signals from PAH-rich regions measured at 515 nm were mostly LIF signals, however, signals from soot-rich regions were determined to be mixed with Mie scattering signals and/or LII signals. Signals measured 1 mm above the excitation height were mostly LII signals from soot particles. The results show that a quantitative determination of the LIF’s contribution to the measured signals would be difficult as long as the experimental setup described here is used for the regions where PAHs and soot particles exist together.
난류 부분예혼합 화염을 이용한 난연성 유증기 처리에 관한 연구
안태국(Taekook Ahn),박선호(Sunho Park),남연우(Younwoo Nam),이원남(Wonnam Lee) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
The potential of combustion treatment of low concentration VOC on a turbulent partially premixed flame has been studied experimentally. The significant decrease in hydrocarbon concentration from the low concentration VOC was observed with a turbulent partially premixed flame. The VOC/inert gas mixture whose fuel concentration is beyond the flammability limit could be treated in this method.
불활성기체로 희석된 동축류 확산화염의 파일럿화염에 의한 안정화
안태국(Taekook Ahn),이원남(Wonnam Lee),박선호(Sunho Park) 한국연소학회 2015 한국연소학회지 Vol.20 No.4
An experimental study was conducted to find the effect of a pilot flame on the flammability of inert-gasdiluted methane and propane. The diffusion pilot flame was formed with propane at the innermost nozzle of a concentric triple co-flow burner. The main diffusion flame was formed with nitrogen-diluted methane or propane at the outermost nozzle of the burner. An air flow was located in-between. The results showed that the existence of the pilot flame helped stabilizing the main flame even at the flammability limit concentration of nitrogen-diluted fuel. The co-flow burner generated re-circulation zones and local variation of equivalence ratio depending on the flow rates of the reactants, which are known to help flame stabilization. Hot-wire experiments confirmed that both heating of the reactants and supplying of active chemical species by the pilot flame contributed to stabilization of the main flame. The results of this study would suggest a design concept for an efficient SVRU system that minimizes the emission of unburned hydrocarbon fuel from ship fuel tanks.
유증기 연소처리를 위한 난류 부분예혼합화염의 활용 및 유동장 가시화
안태국(Taekook Ahn),남연우(Younwoo Nam),박선호(Sunho Park) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
Combustion of low concentration VOC in inert gas around the flammability limit has been experimentally studied. Streams of nitrogen and propane mixture with various compositions and flow conditions were treated by a turbulent partially-premixed pilot flame. HC and CO contents in exhaust gas measured and the flow patterns were visualized. The results suggested that there exists an optimal mixture velocity range for efficient combustion treatment for each flow condition and composition of the mixture.