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문철언(Cheor-Eon Moon),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim),김태형(Tae-Hyung Kim),서상일(Sang-Il Seo) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
미분탄 순산소 연소는 기존의 연소 방법과는 달리 산화제로 O2/CO2를 사용함으로써 NOx의 발생을 감소시킬 수 있으며, 고농도의 CO2를 쉽게 회수 할 수 있어 큰 주목을 받고 있다. NOx의 배출저감을 위한 기술로는 로 내에서의 재연소(reburning), 단계(staging) 연소등이 있으며, 후처리 NOx 저감기술로는 SCR, SNCR등이 있다. 그러나 이러한 기술들은 비용이 비싸다는 단점이 있으며, 미분탄 순산소 연소조건에서는 화염 안정성이 감소하는 문제점이 있다. 따라서 본 연구에서는 화염의 안정성과 밀접한 관련을 가지는 화염전파속도에 대해 미분탄 순산소 연소에서 석탄 입자의 물성치와 주위 기체의 특성이 화염전파속도에 미치는 영향을 수치적 방법을 통하여 해석하였으며, NO 저감의 한 방법인 연소가스 재순환(Flue Gas Recirculation)에 따른 연소특성 및 NO 생성 메커니즘의 영향과 석탄을 가스화 시키는 방법에 따른 연료의 연소특성에 대해 해석하였다. Fig. 1은 주위기체 온도 300K, 산소농도가 40%인 조건에서 탄종별 시간에 따른 화염의 위치를 나타내고 있으며 Fig. 2는 석탄가스화 방법을 O2/Steam으로 하였을 때 FGR이 NO생성에 미치는 영향을 보여주고 있다. 석탄의 활성화 에너지가 작을수록 화염의 최초 발생시기가 빨리 나타났으며 이러한 영향으로 화염전파속도 역시 빨라지게 된다. 또한 연소가스 재순환율이 높을수록 NO의 생성율은 감소함을 확인할 수 있다. <그림 삽입> Fig. 1은 주위기체 온도 300K, 산소농도가 40%인 조건에서 탄종별 시간에 따른 화염의 위치를 나타내고 있으며 Fig. 2는 석탄가스화 방법을 O2/Steam으로 하였을 때 FGR이 NO생성에 미치는 영향을 보여주고 있다. 석탄의 활성화 에너지가 작을수록 화염의 최초 발생시기가 빨리 나타났으며, 연소가스 재순환율이 높을수록 NO의 생성율은 감소함을 확인할 수 있다. 숫자는 아라비아 숫자를 사용하며 단위는 원칙적으로 SI단위를 사용한다. 본문 중에 단위를 사용할 때, 각도와 온도(°, ℃) 및 퍼센트(%)를 제외한 모든 숫자와 단위는 한 칸을 띄어 쓴다. 단위는 Roman 서체로 기입하며, Italic 서체를 사용하지 않는다. (예: 20℃, 50%, 2 ㎏/㎥, 1.5 ㎾/㎡K) 수식은 hwp의 수식편집기를 이용하며 기본적으로 이탤릭체(기본설정), 10 pt 로 하며, 본문에서는 “식(1)”등으로 언급한다. 그림을 삽입하는 경우에 그림 내의 글자 크기는 영문 8 pt.이상이어야 한다. 순차적으로 번호를 붙이며 본문에서 Fig. 1로 인용한다. 표는 인용되는 면의 맨 위나 아래에 배치하며, 인용은 Table 1로 한다. 결론은 서술식으로 기술하거나 또는 각각을 나누어서 번호를 붙일 수 있다. 참고 문헌은 필요시 나열하며, 이 경우에 반드시 영문으로 작성한다. 본문 내에서 인용할 때에는 순서대로 참조되는 저자의 이름 또는 내용의 바로 뒤에 (괄호)안의 숫자를 상첨자로 “(1)”, “(1-3)”, “(2, 5)” 등과 같이 기재한다. 저자가 한 명이거나 두 명일 경우에는 모두의 이름(last name만)을 기입하고, 세명 이상일 경우에는 첫 번째 저자명 뒤에 “et al.”을 사용한다.
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
문철언(Moon, Cheor-Eon),안성율(Ahn, Seong-Yool),양장식(Yang, Jang-Sik),최경민(Choi, Gyung-Min),김덕줄(Kim, Duck-Jool) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
In this study, we estimated the performance of PEMFC's unit cell as changing operating temperature in different inlet humidity condition at cathode side but anode dry, and tried to match experimental results with 1-dimensional simulation. We used Nafion^{circledR}112 membrane and a self-manufactured PEMFC with active area of 25cm^{2} was used in this study. The range of operating temperature was 40{sim}70?C and oxygen through bubbled humidity chamber was supplied 0{sim}80% humidity condition as changing water temperature in humidity chamber. For figuring out governing equations, represent water contents in electrolyte membrane, the linear forward difference method was applied about time progress and quadratic central difference method was used about space progress. It was assumed that pressure terms were linearly changed due to thin electrolyte membrane. In low operating temperature condition, 40{sim}60?C, increasing temperature rarely effected cell performance but we can see performance drop at 70?C. By modifying Henrry's constant and/or diffusion coefficient, the modified one-dimensional model was accomplished for calculation.
캐소드극 입구 가습 조건이 고분자 전해질 연료전지의 성능에 미치는 영향
문철언(Cheor-Eon Moon),이서희(Seo-Hee Lee),고동수(Dong-soo Ko),양장식(Jang-sik Yang),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper shows that inlet humidity condition at cathode side is one of dominant parameters affecting the performance of PEMFC. To investigate effects of inlet humidity condition, the performance measurements were conducted for a single PEMFC with two operating variables : cathode relative humidity and dry condition in anode dry. The fuel cell employed for the experiments is a unit PEMFC with a 25㎠, Nafion<SUP>®</SUP>112 membrane. As a result of this study, the cell performance is getting higher by increasing inlet humidity condition at cathode side. The cell performance is different from each operating temperature an it has maximum30% higher than dry condition at 60℃ operating temperature with 80% relative humidity.
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.
이서희(Lee, Seo-Hee),문철언(Moon, Cheor-Eon),고동수(Ko, Dong-Soo),최경민(Choi, Gyung-Min),김덕줄(Kim, Duck-Jool),정지환(Jung, Ji-Hwan) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
The comparisons between measured performance of lab-scale PEMFC and calculation were conducted to understand the detail phenomena of PEMFC for the various inlet oxygen humidity of cathode side. Experiments were performed at 65?C operation temperature and different inlet humidity conditions such as 40%, 60% and 80%. We used the MEA manufactured by oneself which include Nafion^{(R)} 112 membrane, Nafion solution 20%, and carbon paper(E-TEK). As a result of this experiment, cell performance was getting higher by increasing inlet humidity condition at cathode side because ion conductivity of electrolyte membrane is increased. A 3D CFD simulation model of PEMFC was developed using commercially available CFD code that is one of the STAR-CD module, es-pemfc under same operating conditions. Model calculations results were compared with experimental ones on the polarization curves and calculation results are in good agreement with the experimental ones. Local water distribution and current density inside PEMFC are discussed in detail.
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.
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 순산소 연소에서 주위 기체와 석탄 특성이 화염전파에 미치는 영향
강영민(Young-Min Kang),심영삼(Young-Sam Shim),문철언(Cheor-Eon Moon),성연모(Yon-Mo Sung),서상일(Sang-Il Seo),김태형(Tae-Hyung Kim),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.1
Oxy-fuel combustion of pulverized coal is one of the promising new technologies to reduce CO₂ and NOx from coal combustion. However, the stability of pulverized coal flame is reduced in the oxy-fuel combustion. This flame stability is concerned with the flame propagation that is affected by surrounding gas and coal characteristics, such as gas temperature, gas composition, coal volatile, coal activation energy and coal size. In this paper, a study on the influence of surrounding gas and coal characteristics on the flame propagation velocity in oxy-fuel combustion of pulverized coal was preformed. One dimensional model was used to calculate the flame propagation velocity of pulverized coal clouds. In this model, the radiation is considered to be the main source of heat exchange, and Monte Carlo method was adopted for accurate calculation of radiation heat flux. It was found that the flame propagation velocity become higher with the decrease of coal activation energy and the increase of coal volatile. Also, according to the increase of gas temperature and O₂ concentration, flame propagation velocity increased.