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반경방향 다중 채널 내 예혼합 화염의 안정화와 소염 특성
이대근(Dae Keun Lee),고창복(Chang-Bog Ko) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
Stabilization and extinction characteristics of premixed flames in a radial multi-channel were investigated experimentally and theoretically. In the authors" previous study, a radial multi-channel burner, made of transparent quartz plates, was fabricated and various flame behaviors like stable flame, pulsating instability, sudden extinction, blowout and unstable extinction were mapped on the parameter plane of mixture equivalence ratio and flow rate. In subsequent experiments, another sudden extinction phenomenon of the stable flame was found when reducing the mixture flow rate, which was not covered in the previous study. In order to clarify the mechanism of such extinction, theoretical analysis is conducted. A single divergent channel, constituting the radial multi-channel, is approximated as a quasi-one-dimensional channel with varying mixture velocity as a function of flame position. One-dimensional gas and solid phases energy equations and conservation equation of a deficient species are solved with the large activation energy asymptotics. As a result, leading-order analysis gives S-shaped multiple solutions, which are one stable, one unstable and a physically meaningless branches, and the sudden extinction with reducing the mixture flow rate is theoretically and qualitatively captured by the existence of a critical point transiting from the stable to the unstable branch.
0.1㎿급 동축 연소기를 이용한 미분탄의 산소연소 특성 연구
이대근(Dae Keun Lee),노동순(Dong-Soon Noh),김승곤(Seung Gon Kim),고창복(Chang-Bog Ko),서동명(Dong Myung Seo),최경빈(Kyong-Bin Choi) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Experiments using 0.1㎿-class coaxial combustor were conducted to elucidate the fundamental characteristics of pulverized coal combustion with O₂/CO₂ mixture as oxidizer stream, simulating the Oxy-PC combustion with FGR. For various experimental conditions(coal type, thermal power, now rate and swirl now), measurements of in-furnace temperature and radiative heat flux along the furnace and exhaust gas analysis were conducted. As a result, it was found that coal types and O₂ concentration in supplying oxidant have significant effects on flame temperature. Besides, the radiative heat flux of Oxy-PC case, showing a similar temperature profile with Air-PC case, is 21~61% larger than its counterpart. From the exhaust gas analyses, it is thought that CO₂ concentration higher than 90% in Oxy-PC case can be easily achieved by a well-controlled O₂ amount but the combustor design and the determination of operating conditions are important and necessary to reduce the NOx emission.