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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.
미분탄 취입 공업로의 미분탄 연소에 관한 수치해석적 연구
성연모(Yon-Mo Sung),고동수(Dong-Soo Ko),문철언(Cheor-Eon Moon),안영진(Young-Jin An),곽남수(Nam-Su Kwak),나종문(Jong-Moon Na),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
The combustion of pulverized coal injection is widely used in iron making blast furnace. In this study, various operational conditions including the position of nozzle, injection pattern of the pulverized coal size, inlet temperature of the hot blast and different kind of the pulverized coal are taken into consideration. A prediction of pulverized coal combustion behavior has been developed for coal flow and combustion in tuyere and raceway of a blast furnace using commercial CFD code FLUENT. The simulation results indicate that as the nozzle length is increased, lift length of the flame increases and as the coal size is decreased, flame length increases and as the carbon element of the coal contents is increased, high temperature zone increases and as the volatile matter of the coal contents is increased, the combustion reaction rate increases in the early stage. Consequently, the obtained results have provided a useful insight into the operation of pulverized coal combustion, and they enable us to further improve the blast furnace performance in the future.
미분탄 물성이 난류 분류형 미분탄 화염의 휘발분 반응영역에 미치는 영향
성연모(Yon-Mo Sung),문철언(Cheor-Eon Moon),강영민(Young-Min Kang),안재우(Jae-Woo An),서상일(Sang-Il Seo),김성철(Sung-Chul Kim),김태형(Tae-Hyung Kim),나종문(Jong-Moon Na),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
The availability of 2-dimensional visualization by intensified high-speed camera for detecting volatile reaction region in pulverized coal flames, which is divided into three regions, such as particle heatup region, volatile reaction region and char reaction region, was evaluated by comparing with result from point measurements of chemiluminescence intensity. To investigate the effects of pulverized coal properties on volatile reaction region in turbulent jet pulverized coal flame, various pulverized coal properties such as five different types of pulverized coal, two particle sizes for a bituminous coal and three moisture contents for a sub-bituminous coal were taken into consideration. As a result, the length of volatile reaction region by 2-dimensional measurements was about 11.4% longer than that by point measurements. The obtained results give us useful information for evaluating practical pulverized coal flame. The temperature rise of 35 to 45 ㎛ coal particle was faster than 75 to 90 ㎛ ones, which resulted in shift of volatile reaction region toward upstream. The peak temperature of 35 to 45 ㎛ coal particle was also 35K higher. The coal moisture contents, however, has little effects on the structure of pulverized coal flame under 15% of water content.
역청탄과 아역청탄 혼합연소조건에서 미분탄 입자크기가 열물성반응과 연소특성에 미치는 영향
성연모(Yon-Mo Sung),문철언(Cheor-Eon Moon),안성율(Seong-Yool Ahn),안재우(Jae-Woo An),정원우(Won-Woo Jung),김승일(Seung-il Kim),정동원(Dong-Won Chung),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
In this study, effect of particle size on combustion characteristics and kinetics in the co-combustion with bituminous and sub-bituminous coals is experimentally investigated using a TGA and a laboratory-scale burner. Characteristic parameters including volatile matter release, ignition, burnout temperature and activation energy are determined from TG and DTG combustion profiles. Distribution of flame length and mean particle temperature is investigated from the slit-burner system. The purpose of this study is to provide fundamental information for developing reaction model in the numerical simulation and to provide operating conditions in blended coals power plants. As coal particle size decreased and volatile matter content increased, characteristic temperatures and activation energy decreased. The ignition, burnout characteristics and activation energy showed a linear effect on particle size and blending ratio. These results indicated that the control of the coal blending ratio can improve the combustion efficiency for sub-bituminous coals and the ignition characteristics for bituminous coals.
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.
역청탄과 아역청탄 혼합연소조건에서 입자크기와 혼소율이 열물성반응과 연소특성에 미치는 영향
성연모(Yon-Mo Sung),안재우(Jae-Woo An),문철언(Cheor-Eon Moon),안성율(Seong-Yool Ahn),김성철(Sung-Chul Kim),서상일(Sang-Il Seo),김태형(Tae-Hyung Kim),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2010 한국연소학회지 Vol.15 No.4
In order to provide fundamental information for developing reaction model in the practical blended coal power plants, effects of particle size and blending ratio on combustion characteristics and thermal reaction in co-firing with bituminous and sub-bituminous coals were experimentally investigated using a TGA and a laboratoryscale burner. Characteristic parameters including ignition, burnout temperature and activation energy were determined from TG and DTG combustion profiles. Distributions of flame length and mean particle temperature were investigated from the visualization of flames in slit-burner system. As coal particle size decreased and volatile matter content increased, characteristic temperatures and activation energy decreased. The ignition/burnout characteristics and activation energy are linearly influenced by a variation in particle size and blending ratio. These results indicated that the control of the coal blending ratio can improve the combustion efficiency for sub-bituminous coals and the ignition characteristics for bituminous coals.
성연모(Yon-Mo Sung),문철언(Cheor-Eon Moon),안성율(Seong-Yool Ahn),김승일(Seung-Il Kim),서상일(Sang-Il Seo),김태형(Tae-Hyung Kim),정지환(Ji-Hwan Jeong),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2011 한국연소학회지 Vol.16 No.1
This paper 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.
Numerical analysis of NOx reduction for compact design in marine urea-SCR system
최철영,성연모,최경민,김덕줄 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.6
In order to design a compact urea selective catalytic reduction system, numerical simulation was conducted by computational fluid dynamics tool. A swirl type static mixer and a mixing chamber were considered as mixing units in the system. It had great influence on flow characteristics and urea decomposition into ammonia. The mixer caused flow recirculation and high level of turbulence intensity, and the chamber increased residence time of ureawater- solution injected. Because of those effects, reaction rates of urea decomposition were enhanced in the region. When those mixing units were combined, it showed the maximum because the recirculation zone was significantly developed. NH3 conversion was maximized in the zone due to widely distributed turbulence intensity and high value of uniformity index. It caused improvement of NOx reduction efficiency of the system. It was possible to reduce 55% length of the chamber and connecting pipe without decrease of NOx reduction efficiency.
Effect of static mixer geometry on flow mixing and pressure drop in marine SCR applications
박태화,성연모,김태경,최경민,이인원,김덕줄 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.1
Flow mixing and pressure drop characteristics for marine selective catalytic reduction applications were investigated numerically to develop an efficient static mixer. Two different mixers, line- and swirl-type, were considered. The effect of vane angles on the relative intensity, uniformity index, and pressure drop was investigated in a swirl-type mixer; these parameters are dramatically affected by the mixer geometry. The presence of a mixer, regardless of the mixer type, led to an improvement of approximately 20% in the mixing performance behind the mixer in comparison to not having a mixer. In particular, there was a tradeoff relationship between the uniformity and the pressure drop. Con¬sidering the mixing performance and the pressure drop, the swirl-type mixer was more suitable than the line-type mixer in this study.