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문철언(Cheoreon Moon),성연모(Yonmo Sung),안성율(Seongyool Ahn),김태경(Taekyung Kim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.44
In this study, the thermal behavior and combustion characteristics of different ranks of coals and their blends were investigated to obtain information necessary for the evaluation of the co-processing of blends with low-rank coals. Thermogravimetric analysis(TGA) and differential thermal analysis(DTA) were carried out at different temperature from ambient temperature to 800℃, and a laboratory-scale pulverized coal combustion burner was used with coal feeing rate of 1.04×10<SUP>-4</SUP> kg/s.
역청탄과 아역청탄 혼합연소조건에서 혼소율이 순산소 연소특성에 미치는 영향
성연모(Yonmo Sung),문철언(Cheoreon Moon),안성율(Seongyool Ahn),안재우(Jaewoo An),나종문(Jongmoon Na),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study focuses on the combustion characteristics of blended coals with bituminous and sub-bituminous coals under air and oxy-fuel combustion conditions. The effects of oxygen concentration and blending ratio on the combustion characteristics were experimentally investigated using a thermogravimetric analyser(TGA). Characteristic temperatures including ignition, burnout temperature and activation energy were determined from TG and DTG combustion profiles. As oxygen concentration increased and the presence of sub-bituminous coal, characteristic temperatures and activation energy decreased. The ignitability, reactivity and kinetics have all been greatly improved under oxy-fuel combustion conditions. Based on this, co-firing with bituminous and sub-bituminous coals under oxy-fuel combustion conditions may be suggested as an alternative method to the fuel flexibility and cost-effective power production with carbon capture and sequestration.
15kW급 미분탄 연소로내에서 바이오매스 혼소율 변화에 따른 연소 특성 비교
이상민(Sangmin Lee),성연모(Yonmo Sung),최민성(Minsung Choi),문철언(Cheoreon Moon),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
This study focused on the effect of the biomass blended ratio on air-staged pulverized coal furnace. The hybrid NOx reduction technology between fuel blending and air staging has been applied in an air-staged pulverized coal fired furnace. The results indicated that co-firing biomass with coal could reduce NOx emissions in an air-staged combustion. In addition, carbon burnout and flame temperature increased under the air-staged condition. A dominant synergistic effect on NOx reduction and carbon burnout was observed when biomass co-firing with coal was applied in air staged combustion.
미분탄 이중 스월화염에서 스월강도 및 석탄 입경 변화 영향 연구
최민성(Minsung Choi),성연모(Yonmo Sung),이상민(Sangmin Lee),문철언(Cheoreon Moon),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
The present work focuses on the analysis of the pulverized coal combustion aerodynamics of the dual swirl burner by the control of the swirl-modes such as the outer swirl intensity (OSI). The detailed structure of pulverized coal swirling flames with swirl-mode was studied experimentally by particle image velocimetry and local flame colors based on OH<SUP>*</SUP>, CH<SUP>*</SUP>, and C₂<SUP>*</SUP> radicals. For all co-swirling conditions, the internal recirculation zone (IRZ) was observed near the inner shear layer with respect to the processing vortex core structure. Furthermore, a co-rotating vortex in the outer shear layer and the exhaust tube vortex (ETV) along the central axis were observed. The intensity of CH<SUP>*</SUP> signal was higher with small coal particle size, conversely, the size of the distribution of the CH<SUP>*</SUP> signal becomes larger. Therefore, the control of the aerodynamics with changing swirl intensities may play an important role in improving both environmental and combustion performances.