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미분탄 순산소 연소 운전 모드 전환 과정에 대한 Pilot 규모 설비에서의 실험적 연구
최종균(Chong Gun Choi),나익환(Ik Hwan Na),이재욱(Jae Wook Lee),채태영(Tae Young Chae),양원(Won Yang),김영주(Young Ju Kim),김종안(Jong An Kim),서상일(Sang Il Seo) 한국연소학회 2011 한국연소학회지 Vol.16 No.3
Oxy-coal combustion for CO2 capture in coal power plants entails a mode switching from air-firing to oxy-firing. In this study, procedure of the mode switching was investigated and discussed through experiments in pilot scale facilities: (I) a 0.3 MWth furnace with a vertical single burner and a FGR (Flue Gas Recirculation) system (2) a I MWth furnace with horizontal 4 burners and a FGR system. Principle of the mode switching was established and performed with control of FD fan, FGR fan, ID fan and oxygen flow rates. We have found that equivalence ratio in the oxy-firing mode should be increased more than that in the air-firing to achieve stable mode switching. Control of FD, ID and FGR fans should be performed carefully in the mode switching, in the sense of complete combustion and flame attachment. Moisture contents in the ash and the flue gas recycled to the primary oxidizer stream should be removed to prevent condensation, corrosion and duct clogging.
수증기-메탄개질용 Ni 촉매의 유용도에 관한 수치적 연구
최종균(Choi, Chong-Gun),남진현(Nam, Jin-Hyun),신동훈(Shin, Dong-Hoon),정태용(Jung, Tae-Yong),김영규(Kim, Young-Gyu) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Reformers which produce hydrogen from natural gas are essential for the operation of residential PEM fuel cells. For this purpose, steam-methane reforming reactions with Ni catalysts is primarily utilized. Commercial Ni catalysts are generally made to have porous pellet shapes in which Ni catalyst particles are uniformly dispersed over Alumina support structures. This study numerically investigates the reduction of catalyst effectiveness due to the mass transport resistances posed by porous structures of spherical catalyst pellets. The multi-component diffusion through porous media and the accurate kinetics of reforming reaction is fully considered in the numerical model. The preliminary results on the variation of the effectiveness factor according to different operation conditions are presented, which is planned to be used to develop correlations in future studies.
최종균(Chong Gun Choi),나익환(Ik-Hwan Na),이재욱(Jae Wook Lee),채태영(Tae Young Chae),방병열(Byung Ryeul Bang),양원(Won Yang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study is aimed to derive design parameters of an oxy-PC burner through investigating combustion characteristics of an oxy-fuel combustion test unit by experimental approach. For various design parameters, temperature distributions were observed for air and oxy-fuel conditions. Among these, effects of various O₂ concentration in the total oxidant and O₂ concentration of primary oxidizer stream was evaluated. We found that NOx emission in the operating conditions of oxy-PC is lower than those of air-PC, and temperature distribution of oxy-27% in the oxidizer is similar to air-PC than other oxy conditions. Meanwhile, if O₂ concentration of primary oxidant reaches a certain level that those is not significant parameter in flame stability expressed by CO emission. However, more investigation should be performed for design of a real-scale oxy-PC burner.
최종균(Chong-Gun Choi),채태영(Tae Young Chae),양원(Won Yang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Important considerations for design of a combustion system in an oxy-PC power plant, which includes pulverizer, ducts for coal transport, burners and furnace are summarized in this paper. In an oxy-PC power plant of 1st generation, design of the combustion system is based on design procedure of conventional air-firing system. In this paper, considerations for determining main parameters such as oxygen concentrations in primary/secondary oxidizer stream, and dehumidification in the flue gas are suggested and their effects on FEGT (furnace exit gas temperature) are evaluated.
미분탄 순산소 연소시 배가스 재순환률 및 산화제 제습의 영향에 관한 연구
최종균(Chong-gun Choi),류창국(Changkook Ryu),양원(Won Yang),채태영(Tae-yong Chae) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Oxy-fuel combustion is one of the important technologies for carbon capture and storage technology to be applied in coal power plants. This study is aimed to determine key design parameters related to the flue gas recirculation and dehumidification of the recycled flue gas. In this study, for the first generation of an Oxy-PC combustion system in which air separation unit(ASU) and flue gas recirculation (FGR) are integrated with an existing power plant, parametric study has been performed through engineering approaches, i.e. (1) 0-dimensional heat and energy balance, (2) Experimental approaches in a reduced-scale combustion chamber and (3) 3-dimensional numerical simulation. Effects of the flue gas recirculation ratio and dehumidification to combustion characteristics in the combustion system were investigated in the combustion systems of various scales.
미분탄 순산소 버너의 화염 안정성 파악을 위한 실험적 연구
최종균(Chong-Gun Choi),나익환(Ik-Hwan Na),채태영(Tae Young Chae),류태우(Tae-U Yu),양원(Won Yang),강태석(Tae Seok Kang),김태형(Tae Hyung Kim),서상일(Sangil Seo),류승관(Seung Kwan Ryu) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Oxy-coal combustion is one of the key technologies for CO2 capture in coal power plants. In this study, flame stability of an oxy-puverized coal flame was investigated in two burners: a 300 ㎾ pulverized coal burner in KITECH and a 1 ㎿MW pulverized coal burner in KEPRI. Flame attachment characteristics were observed visually for air and oxy-fuel conditions, and effect of various ratios of primary and secondary oxidants was also investigated. We found that the operating conditions of oxy-PC flame should be determined more carefully than those of air-PC flame, observing characteristics of the flame attachment in various conditions. Based on the information, stable flame could be achieved for various oxygen concentrations in the oxdizer stream. However, more investigation should be performed for design of a real-scale oxy-PC burner.
순산소 화력발전 시스템의 연소운전 모드 전환 과정 고찰
최종균(Chong-gun Choi),나익환(Ik-hwan Na),이재욱(Jae-wook Lee),양원(Won Yang),채태영(Tae-yong Chae) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
Oxy-coal combustion is one of the key technologies for CO₂ capture in coal power plants. In this study, consideration for operation mode transition of oxy-PC combustion was investigated by experiments in a 0.4㎿ single burner furnace with FGR(Flue Gas Recirculation) system. We found that control of fans(FD, ID and FGR) should be determined more carefully than those of air-PC, observing stoichiometry ratio and flame attachment. And we found that moisture of ash and exhaust gas should be removed to prevent condensation, corrosion and duct clogging.
‘N’ 자원회수시설 광역화에 따른 소각량 증대 운영 결과
최종균(Chong-Gun Choi),이후만(Hu-Man Lee),박관선(Gwan-Sun Park),임문재(Mun-Jae Lim),윤용승(Young-Sung Yun),이승무(Seung-Mu Lee),이수구(Su-Goo Lee),신동훈(Donghoon Shin) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Facility safety verification and improvement needs to apply extra incineration rate of 'N' MSW incinerator with neighbor local governments for cooperative utilization. The purpose of this paper is to estimate the propriety incineration rate through operation data from the single or couple unit working test in the existing facilities. The problems during the various incineration rate operations are investigated by the dioxin measurements process temperatures and computational fluid dynamics (CFD) simulation. As the incineration rate increased, the gas temperature of furnace exit increase accordingly, which reaches above 1000 ℃ at 80 % incineration rate. The flue gas temperature at the superheater inlet reached the peak temperature of 660 ℃ at over 80 % incineration rate. As the incineration rate increased, CO emission shows low relationship, but NOx is straightly increase with the incineration rate and the peak is 35 ppm at 83 % incineration rate. The dioxin is satisfied with the standard regulation, but results are more than the target(0.01 ng-TEQ/N㎥). CFD is used of find the reason of generation at clinker of combustion chamber wall when the incineration rate is above 75 %, and these results show that the study for cooling of the combustion chamber and the more suitable flow pattern needs to increase incineration rate.
최종균(Chong-Gun Choi),정태용(Tae-Yong Chung),남진현(Jin-Hyun Nam),신동훈(Donghoon Shin) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.7
Hydrogen is considered as a fuel of the future for its renewability and environmental compatibility. The reforming of hydrocarbon fuels is currently the most important source of hydrogen, which is expected to continue for next several decades. In this study, extensive CFD simulations on the steam-methane reforming process were conducted to study the performance of four reaction models, i.e. three Arrhenius-type models and a user-defined function (UDF) model. The accuracies of different reaction models for various operating temperatures and steam carbon ratios (SCRs) were evaluated by comparing their CFD results with zero-dimensional intrinsic model of Xu and Froment. It was found that the UDF model generally produced more accurate results than Arrhenius-type models. However, it was also shown that Arrhenius-type models could be made sufficiently accurate by choosing appropriate reaction coefficients, and thus could also be useful for the simulation of the steam-methane reforming process.