http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
나익환(Ik-hwan Na),양동진(Dong-jin Yang),최신영(Sin-yeong Choi),이정우(Jeong-woo Lee),류태우(Tae-woo Ryu),양원(Won Yang) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
We made syngas by reformer of multi-stage pyrolysis experiment apparatus for heavy-oil mix combustion. LNG reforming with oxy-fuel burner makes patial oxidation condition by controlling quantity of oxgen and LNG. Purpose of this experiment is to find the point that temperature of reformer keep partial oxidation condition by controlling stoichiometric ratio. And Check up possibillity of changing quantity of LNG and oxydizer that to change concentration of hydrogen and carbon monoxide.
나익환(Ik-hwan Na),양원(Won Yang),채태영(Tae young Chae) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
Non-catalystic partial oxidation of methane were compared with experimental results of chemical equilibrium calculation. Air and oxygen enriched air were used as oxidizers, in both experiments and calculations. Mass balance and energy balance were also performed for experimental results and the energy required for the partial oxidation of methane was estimated. Experimental results showed agreements in trend with the calculation results but there were also significant differences due to differences in temperature distribution in the reactor, and aerodynamics in the reactor should be also considered under the view of turbulent mixing.
나익환(Ik Hwan Na),이재욱(Jae Wook Lee),강기섭(Kie Seop Kang),양원(Won Yang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
This article presents experimental result of syngas reburning in alab-scale furnace with a gas burner. Syngas was used as reburn fuel that is targeted gas through gasification or pyrolysis of low-rank coal. Heating value of this syngas is about 890㎉/N㎥. local temperature data in furnace were obtained to check the temperature distribution in reburn zone. And flue-gas composition such as O₂, CO, NOx were obtained to investigate the reduction of characteristics of NOx. Temperature distribution of furnace was not varied significantly for various stioichiometric ratios in the reburning zone, but NOx reduction was observed for higher stiochiometric ratio in the reburning zone as highly reburning rate.
나익환(Ik-hwan Na),채태영(Tae-young Chae),방병열(Byoung-yeol Bang),양원(Won Yang) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Noncatalytic partial oxidation of methane for producing synthesis gas was studied in a lab-scale experimental apparatus. Partial oxidation developed for high-temperature, fuel-rich combustion and it is exothermic process. but Steam reforming is highly endothermic process to need much energy. Noncatalytic partial oxidation of methane is affected by temperature and equivalent ratio, so we studied effect about composition of synthesis gas at lab scale reactor. We used electronic heater to control the temperature of reactor. The quality of synthesis gas is improved and reduced heat value to require at Noncatalytic partial oxidation because the reacting temperature is lower at oxy condition.
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.
채태영(Tae-Young Chae),나익환(Ik-hwan Na),류창국(Chang-kook Ryu),양원(Won Yang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
This study is aimed to compare results of computational fluid dynamics and experimental results by non-catalytic partial oxidation of methane. The experiment result, pure oxygen burner was used and experiment was performed by measuring syngas concentration for various stoichiometric ratios. Based on experiments pilot scale reformer were employed and its parameter was resulted by using fluent 6.3. The simulation results similar that experimental results, and we confirmed the simulation of tthe internal reformer. In this study will be helped design modification of reformer.
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.
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.
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.
2 ㎿<SUB>th</SUB> 멀티버너 중유 연소 시스템에서의 합성가스 혼소 및 재연소 특성 연구
양원(Won Yang),양동진(Dong Jin Yang),최신영(Sin Young Choi),나익환(Ik-hwan Na),최종균(Chong-Gun Choi),채태영(Tae-Young Chae),방병열(Byung Reol Bang),김종수(Jong Soo Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study is aimed to investigate characteristics of syngas co-combustion and reburning in a heavy oil - firing combustion chamber. Syngas was produced by partial oxidation of methane, and was supplied to just above the burner level. Overfire air (OFA) was used to burnout the unburned species. Reburning and reburning + staged combustion cases with total thermal input of 2 ㎿th have been tested, and the NOx emission could be reduced by ~50% maximum. Comparing with the previous experiments performed in the environment of < 1000℃ in the combustion chamber by 0.9 ㎿th input, reduction of NOx in the reburning zone effects of temperature in the chamber was investigated clearly, which implied that the high temperature in the furnace is essential for increasing the NOx reduction.