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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.
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.
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.
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.
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.
LNG 기화열을 이용한 수조 수온 냉각성능에 관한 실험적 연구
이상곤(Sang-Gon Lee),서재덕(Jae-Deok Seo),강민석(Min-Suk Kang),성연모(Yon-Mo Sung) 한국산업기술융합학회(구. 산업기술교육훈련학회) 2023 산업기술연구논문지 (JITR) Vol.28 No.4
본 연구에서는 해수식 기화기를 사용한 LNG의 기화과정과 이를 통해 냉각된 냉해수를 양식 수조에 공급하는과정을 모사하여 열전달 성능실험을 진행하였다. LNG 대신 액체질소를 활용하여 액체질소 공급유량, 물 공급유량및 양식 수조 노즐의 분사각도 변화에 따른 수조수온 변화를 실험적으로 분석하였다. 물 공급유량을 0.05 kg/s으로 고정하고 액체질소 유량을 0.0058 kg/s, 0.0075 kg/s, 0.0092 kg/s으로 변경하여 실험한 경우, 0.0092 kg/s의 실험조 건에서 목표온도인 17℃에 도달하였다. 물 공급유량을 0.05 kg/s, 0.07 kg/s, 0.08 kg/s, 0.10kg/s으로 설정하고 각유량에 액체질소 유량을 동일하게 0.0092 kg/s으로 고정하여 실험한 경우 물 공급유량 0.05 kg/s, 0.07 kg/s인 실험 조건에서 목표 온도인 17℃에 도달하였다. 수조에 공급되는 물 분사 노즐의 각도를 0°, 30°, 60°로 조정한 경우 목표온도인 17℃에 가장 빠르게 도달하는 조건은 수조 접선 방향으로 물이 분사되는 0° 실험조건이었다. In this study, a heat transfer performance experiment was conducted by experimentally testing the vaporization process of liquefied natural gas (LNG) using a seawater vaporizer and the process of supplying cooled seawater to the aquaculture tank. By using liquid nitrogen instead of LNG, we experimentally analyzed changes in tank water temperature according to changes in liquid nitrogen supply mass flow rate, water supply mass flow rate, and injection angle of the aquaculture tank nozzle. When testing was conducted by fixing the water mass flow rate at 0.05 kg/s and changing the liquid nitrogen mass flow rate to 0.0058 kg/s, 0.0075 kg/s, and 0.0092 kg/s, the target temperature of 17°C was reached under the experimental condition of 0.0092 kg/s. When the water supply mass flow rate was set to 0.05 kg/s, 0.07 kg/s, 0.08 kg/s, and 0.10 kg/s at the constant mass flow rate of liquid nitrogen of 0.0092 kg/s, the target temperature of 17°C was reached under the experimental condition of 0.07 kg/s. When the angle of the water nozzle was adjusted to 0°, 30°, and 60°, the fastest way to reach the target temperature of 17°C was the 0° experimental condition in which water was injected tangentially to the water tank.
난류 분류형 미분탄 화염에서의 초저급탄 혼합연소 특성 관찰
문철언(Cheor-Eon Moon),성연모(Yon-Mo Sung),안성율(Seong-Yool Ahn),나종문(Jong-Moon Na),김덕줄(Duck-Jool Kim),최경민(Gyung-Min Choi) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
This paper investigated ignition behavior and combustion characteristics in terms of coal blends including Indonesian ultra low rank coal that were fired in a lab-scale slit burner system. The first part of this paper estimated ignition time and combustion region using flame images and CH<SUP>*</SUP> chemiluminescence intensity. The result showed variation of ignition time and combustion region with coals and their blends. Ignition time was influenced by moisture content and ignition time got faster with decreasing moisture contents in coal particles. Combustion region was divided into three regions with CH<SUP>*</SUP> intensity. In case of the blends, even though particle preheating region increased by moisture contents, overall combustion region except char reaction shorten due to the influence of volatile reaction in a bituminous coal. The second part of this study carried out experimental researches on mean flame temperature and OH<SUP>*</SUP>, CH<SUP>*</SUP> and C2<SUP>*</SUP> chemiluminescence intensity distribution. The mean flame temperature increased along with combustion reaction, and C2<SUP>*</SUP>/CH<SUP>*</SUP> in the blends decreased little more than bituminous’ one because of reduced fixed carbon contents from the blends induced by a decrease in unburned carbon contents of a bituminous coal