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바이오매스 가스화 과정에서의 온도와 가습의 변화가 전환가스 조성에 미치는 영향
안성율(Seong-Yool Ahn),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
An experimental study was carried out to investigate gasification process of wood sawdust in the 1-dimensional downdraft fixed bed gasifier. The preheated air was used oxidizer and steam were used as a gasifying agent. The operating parameters, the supplied air temperature and steam were used. The oxidizer temperature was varied from 500K to 620K and vapor was added. The gasification process was monitored by measuring temperature at three position near the biomass using -type thermocouples and the syngas composition was analyzed by gas chromatograph. The change of hydrogen and carbon monoxide, carbon dioxide, methane was observed. Overall, the volume fraction of hydrogen and methane were increased widely as increasing the oxidizer temperature and adding steam.
공기의 온도와 수증기가 목재 톱밥의 가스화에 미치는 영향
안성율(Seong-Yool Ahn),최경민(Gyoung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was carried out to investigate gasification process of wood sawdust in the 1-dimensional downdraft fixed bed gasifier. The preheated air which was used oxidizer and steam were used as a gasifying agent. The downdraft fixed bed gasifier obtains more amount of hydrogen and methane by increasing residence time of supplied air. The operating parameters, the supplied air temperature and steam were used. The oxidizer temperature was varied from 500K to 620K and vapor was added. The gasification process was monitored by measuring temperature at three position near the biomass using R-type thermocouples and the syngas composition was analyzed by gas chromatograph. We get the sample gas at the end of gasifier and it was eonugh time to finishing the chemical reaction. Finally, the amount of hydrogen and methane were increased widely as increasing the oxidizer temperature and adding steam.
공급공기의 온도 변화와 수증기가 바이오매스 가스화 과정에서 전환가스의 발열량에 미치는 영향
안성율(Ahn, Seong-Yool),문철언(Mun, Cheol-Eon),최경민(Choi, Gyung-Min),김덕줄(Kim, Duck-Jool) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
An experimental study was carried out to investigate the heat value change by various conditions of wood sawdust gasification in the 1-dimensional downdraft flow fixed bed gasifier. The preheated air and steam were used as a gasifying agent. The components of syngas were influenced increasing residence time of supplied agent. The operating parameters, the supplied agent temperature and steam addition were used. The oxidizer temperature was varied from 500K to 620K. The gasification process was monitored by measuring temperature at three points near the biomass using R-type thermocouples and the syngas composition was analyzed by gas chromatograph. We get the sample gas at the end of gasifier. Finally, the amount of hydrogen and methane were increased widely as increasing the oxidizer temperature and adding steam.
석탄 물성에 따른 직접탄소 연료전지의 전기화학 반응 특성 연구
엄성용(Seong Yong Eom),이영훈(Young Hoon Rhie),문철언(Cheor Eon Moon),성연모(Yon Mo Sung),최경민(Gyung Min Choi),김덕줄(Duck Jool Kim),안성율(Seong Yool Ahn) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.10
본 논문에서는 석탄의 물리적ㆍ화학적 구조에 의한 직접탄소 연료전지 내부의 전기화학 반응 특성의 변화에 대하여 연구하였다. 석탄의 구조, 표면적 및 기공체적, 작용기의 분포 등을 분석하기 위하여 다양한 분석 기법(TGA, XRD, BET, XPS)을 사용하였다. 석탄 내부에 존재하는 탄소의 강력한 결정 구조는 연료의 비표면적 및 기공크기를 축소시켜 고 전류밀도 영역에서 급격한 포텐셜의 감소를 초래한다. 표면에 분포하는 작용기는 저전류 밀도 영역에서의 전기화학 반응에 영향을 미치며, 제한 전류밀도 및 최대 전력밀도는 전체 탄소의 양과 밀접한 상관관계를 가지고 있다는 것을 확인할 수 있었다. 전해질의 물질전달 향상 및 작동온도에 의한 영향도 논하였다. Performance evaluation of a direct carbon fuel cell (DCFC) was conducted according to coals and a graphite particle. Several fuel properties such as thermal reactivity, textural structure, gas adsorption characteristic, and functional groups on the surface of fuels were investigated and their effects on electrochemistry were discussed. The strong carbon structure inside of fuels led the rapid potential decreasing in high current density region, because it caused small surface area and low pore volume. The functional groups on the surface were related to the low current density region. The maximum current density and power density of fuels were affected by the total carbon content in fuels. The effect of operating conditions such as stirring rate and operating temperature was investigated in this study.
바이오 드라잉 공정이 바이오매스 기반 발전 플랜트의 에너지 절감에 미치는 영향
박종혁(Jong-Hyeok Park),안성율(Seong-yool Ahn),박영수(Yeong-Su Park),성호진(Ho-Jin Sung) 한국환경에너지공학회 2023 열환경공학 Vol.18 No.1
The research on utilizing renewable energy, which emits less greenhouse gas compare to fossil fuels, is getting noticed as environmental problems arise. Hydrogen energy and biomass as well as natural energy sources such as solar heat, wind power, geothermal heat, etc. are attracting attention as new and renewable energy sources. For efficient usage of biomass, several pre-treatment process is needed. The torrefaction process removes moisture and volatile gases to produce a solid fuel with a high ratio of fixed carbon. The bio-drying process using the metabolic heat of microorganisms charges less operating costs compared to commercial thermal drying processes. The biomass based power plant applying bio-drying process was modeled with a process simulator and the effect on energy saving was compared with the plant applying thermal drying process. By replacing the thermal drying process to the bio-drying process, heat recovery was needed to use waste heat. In the case applying bio-drying process, boiler feed water preheating and additional steam generation was considered for heat recovery. The required energy for bio-drying process was reduced about 500 kW and required feed stock was reduced about 13%. Though the simulated process has simple heat exchanger network, energy was saved as applying bio-drying process. The bio-drying process is expected to be effective for processes utilizing biomass to save energy.
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.
미분탄과 목재 바이오매스 혼합 연료의 연소 및 열분해 특성에 관한 연구
안재우(Jae Woo An),안성율(Seong Yool Ahn),문철언(Cheor Eon Moon),성연모(Yon Mo Sung),서상일(Sang Il Seo),김태형(Tae Hyung Kim),최경민(Gyung Min Choi),김덕줄(Duck Jool Kim) 한국연소학회 2010 한국연소학회지 Vol.15 No.2
The effect of co-firing with pulverized coal and wood biomass on ignition and burn-out temperature was investigated at air and oxy-fuel conditions by thermo gravimetric analyzer(TGA). Three kinds of coal(shenhua, adaro, wira) were selected and mixing ratios of coal and wood biomass was set to 1, 0.5, and 0.8. The ignition temperature depended on the amount of volatile matter of blended fuel, while the burn-outtemperature was dominated by the oxidant ingredients. The oxy-fuel condition with an oxygen ratio(Ofr,o)of 0.3 showed similar tendency with air condition in the heat flow measurement. Volatile matter reaction, however, became dominant when oxygen ratio exceeded 0.8 for co-firing combustion of wood biomass and pulverized coal.
순산소 연소조건에서 미분탄과 목재바이오매스 혼합에 따른 열반응 특성 변화에 관한 연구
안재우(Jae Woo An),안성율(Seong Yool Ahn),문철언(Cheor Eon Moon),성연모(Yon Mo Sung),최경민(Gyung Min Choi),김덕줄(duck Jool Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
In this study, in order to investigate the effect of blended biomass with two kinds of pulverized coal(bituminous:shenhua, subbituminous:adaro) on the combustion and thermo pyrolysis, ignition, burn-out characteristics at air and oxy-fuel conditions were measured by thermo gravimetric analyzer(TGA). Oxy-firing technique used the carbon dioxide instead of nitrogen as the oxidant for a solution of green gas problem. The mixing ratio of coal and wood biomass used in this study is 1, 0.5, 0.8. The ignition temperature was governed by rate of biomass which has much volatile matter comparing with coals. But burn-out temperature depended on oxidant ingredients than fuel components.
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