• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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• pp.171-174
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• 2012

Thermophotovoltaics is the direct energy conversion technology from thermal to electric (voltaic) energy via photon radiation, without any thermodynamic cycle. It is, in general, accomplished by immersing solid body in high temperature heat source (e.g. combustion field), in order to achieve high intensity irradiation, and by receiving the radiation thereof on photovoltaic cells. In this paper, advantages of combustion in porous inert medium in applying to the thermophotovoltaics are discussed in a view of its excess enthalpy features. In addition, the similarities of flame behaviors in porous inert medium to both in single and multi-channels are described.

• 설비공학논문집
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• 제6권4호
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• pp.399-405
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• 1994

Beacuse of the energy resources exhaustion, the aggravating environmental air pollution and the smoke phenomena etc., the importance of clean gas fuel compared with liquid fuel is highly considered in recent years. The combustion system which consists of porous media is actively studied as a new method for solving above problems. Therefore, excess enthalpy combustion using porous media was interested by many researchers and investigated through numerical and experimental analysis. In this study, the simplified combustor has the unique combustion characteristics of mixture gas preheated effect using radiative and convective heat energy by changing the flow passage of unburned gas with solenoid valves and has the intensive excess enthalpy phenomena As the result of according to reduce equivalence ratio, flame temperature was remarkably higher than adiabatic flame temperature. This show the ability of super-lean combustion.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.139-140
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• 2014

Stabilization characteristics of highly $N_2$-diluted $CH_4-O_2$ flame in an axially two-section porous inert medium were experimentally investigated for its application to the waste gas scrubber in semiconductor manufacturing processes. The flame behaviors were observed with respect to the fuel and $N_2$ flow rates and the equivalence ratios. As a result, four kinds of flame behaviors such as stable, flashback crossing the interface, blowout and sudden extinction were observed.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.135-137
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• 2014

Excess enthalpy flame propagating an porous inert medium, which recirculate exhaust heat to the upstream cold mixture, is theoretically analyzed. Using the activation-energy asymptotics, the flame structure is divided into the thin reaction and the gas-phase preheat zone, as is traditionally done. Ahead and behind of the two, there exist an outer preheat zone, where heat is convectively transferred from solid to gas, and a downstream re-equilibrium zone, where thermal equilibrium between phases is established. Asymptotic solutions of species and energy equations in each zone are obtained and then matched to each other, and finally the mass burning rate is obtained as a function of the flame propagation velocity with respect to the solid phase and physical properties of gas and solid.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.405-406
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• 2014

• 대한기계학회논문집
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• 제12권5호
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• pp.1113-1120
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• 1988

본 연구에서는 4종류의 실험 모델을 채택하여 연소 반응용다공성 블럭(combu- stive reacting porous block)내의 화염대 위치와 화염의 온도 분포, 화염이 안정화 되는 범위를 고찰하여 내부 열재순환 효과를 규명하고 예열용 다공성 블럭(preheating porous block)과 복사 차폐용 다공성 블럭(radiative insulating porous block)의 효 과에 대한 연구와 초희박 혼합기나 저 발열량 연료의 연소 가능성을 제시하고 수치 계 산에 필요한 자료를 제시하는 것이다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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• pp.46-49
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• 2006

Extinction limits and combustion temperatures in heat-recirculating excess enthalpy reactors employing both gas-phase and catalytic reaction have been examined previously, with and emphasis Reynolds number (Re) effects and possible application to microscale combustion devices. However, Re is not the only parameter needed to characterize reactor operation. In particular, the use of a fixed reactor size implies that residence time and Re cannot be adjusted independently. To remedy this situation, in this work geometrically similar reactors of different physical sizes were tested with the aim of independently determining the effects of Re and Da. It is found that the difference between catalytic and non-catalytic combustion limits narrow as scale decreases. Moreover, to assess the importance of wall thermal conductivity, reactors of varying wall thickness were studied. From these results the effect of scale on microscale reactor performance and implications for practical microcombustion devices are discussed.

• 한국추진공학회지
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• 제15권1호
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• pp.1-10
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• 2011

가스연소와 촉매연소 실험을 통해 열교환 연소기의 연소 및 소염한계에 대하여 레이놀즈 수에 적용하여 성능평가를 수행하였으며, 마이크로 스케일 연소 장치에 대한 적용 가능성에 대해 살펴보았다. 본 논문에서는 연소기의 특성을 살펴보기 위해 나선형 연소기의 물리적 크기와 회전수를 변화시킨 스위스롤 연소기를 제작하여 실험을 수행하였다. 또한 연소가스 분석을 통한 연소효율에 대해서도 살펴보았다. 실험 결과를 바탕으로 스위스롤 연소기의 최적 작동상태에 대해서도 분석하였다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2013년도 제46회 KOSCO SYMPOSIUM 초록집
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• pp.45-46
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• 2013

Stabilization characteristics of highly $N_2$-diluted $CH_4-O_2$ flame in an axially two-section porous inert medium were experimentally investigated for its application to the waste gas scrubber in semiconductor manufacturing processes. The flame behaviors were observed with respect to the fuel and $N_2$ flow rates and the equivalence ratios. As a result, four kinds of flame behaviors such as stable, flashback crossing the interface, blowout and sudden extinction were observed. It was also found that there exists two flame regime divided by a critical fuel flow rate. In addition, the flame stability was discussed based on the $N_2$ index which means the abatement capacity of our combustor in scrubbing the waste gas from the semiconductor processes.

• 청정기술
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• 제23권2호
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• pp.181-187
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• 2017

반도체 및 디스플레이 산업에서 배출되는 과불화합물은 연소, 열, 플라즈마, 촉매 등의 다양한 방법이 적용된 스크러버에 의해 분해 과정을 거친 후 배출되나, 운영 스크러버의 대부분이 과도한 에너지의 사용, 낮은 저감 효율을 보임으로써 이러한 단점의 극복이 요구된다. 압력순환흡착법과 다공성 매체 연소법의 두 가지 기술이 연계된 새로운 형태의 과불화합물 저감 스크러버를 개발하고 특성을 알아보았다. 분해 대상인 $CF_4$의 흡착비와 손실계수는 흡착 컬럼의 입구와 출구에서 농도 측정을 통해 계산하였으며, 연소기의 입구와 출구의 유량과 농도 측정을 통해 처리 효율을 계산하였다. 기존 스크러버와의 에너지 사용량 및 처리효율 비교를 위하여 다양한 유량에 대한 성능 평가가 진행되었다. 1412 ppm, 204 LPM의 $CF_4$가 유입된 흡착 컬럼에서의 흡착비는 1.65였으며, 유입되는 $CF_4$의 손실 계수는 8.2%였다. 이때 연소기로 유입되는 $CF_4$의 유량과 농도는 각각 91 LPM과 2335 ppm이었으며, $CF_4$ 19 LPM, $O_2$ 40 LPM을 사용한 연소 반응시 약 96%의 저감 효율을 나타내었다. 상용 스크러버와의 동일 운전 조건에서의 다공성 매체 연소에서의 $CF_4$ 저감 효율과 전체 에너지 사용 효율 비교시 각각 16%, 41% 이상의 저감 효율 상승과 에너지 절감 효과를 보였다.