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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.
성연모,최철용,Cheoreon Moon,Seongyong Eom,이종재,김병두,최경민,김덕줄 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
The flow, combustion and emission characteristics of nontraditional ring-fired-type furnaces were investigated numerically to evaluatethe effects of incorporating additional inner water walls on the heat transfer, carbon burnout and emissions of nitrogen oxides. Both tangentiallyand ring-fired-type furnaces were considered and the ring-fired-type furnaces were divided into four inner-water-wall cases:without, normal type, radiant expended type and both radiant and convective expended type. The presence of the inner water wall led toan improvement of approximately 50% in the heat flux. In particular, the reduction in nitrogen oxide emissions was approximately 30%,whereas the carbon burnout was kept constant.
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.
Min, Byungchae,Jang, Seokhoon,Lee, Taemin,Bae, Heunghee,Moon, Cheoreon,Choi, Gyungmin IPC Science and Technology Press 2019 International journal of refrigeration Vol.107 No.-
<P><B>Abstract</B></P> <P>In this study, the performance of a multi-split VRF system using the bypass cycle and injection cycle is evaluated using the numerical simulation as a possible sub-cooling method to prevent flash gas generation in liquid pipelines. The simulation for the multi-split VRF system is developed by considering the applications of the bypass cycle and injection cycle, and is validated with experimental data. The bypass cycle and injection cycle in the multi-split VRF system yield improvements in their cooling capacities of the order of 3.22% and 13.43%, respectively, and energy efficient ratio (EER) of the order of 1.98% and 1.72%, respectively. The input power of the injection cycle is reduced by up to 4.45% when the performance of the multi-split VRF systems with bypass cycle and injection cycle is compared under the same cooling capacity conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The bypass cycle and injection cycle in a multi-split VRF system help increase the sub-cooling degree at inlet of EEV. </LI> <LI> Energy efficiency ratio (EER) of the multi-split VRF system increases with application of the bypass cycle and injection cycle. </LI> <LI> Performance of the VRF system with the injection cycle is more efficient under the same cooling capacity. </LI> </UL> </P>