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RISS 인기검색어
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- 저자 : 국진우 ( Jin Woo Kook ) (검색결과 11 건)
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국내(國內) 바이오매스 에너지 잠재량(潛在量) 및 밀집도(密集度) 분석(分析)
국진우,신지훈,류호성,이시훈,Kook, Jin Woo,Shin, Ji Hoon,Yoo, Ho Seong,Lee, See-Hoon 한국자원리싸이클링학회 2013 자원리싸이클링 Vol.22 No.5
The biomass resources is one of promising ways to solve energy exhaustion issues and global warming issues at the same time. To evaluate domestic biomass resources potential such as agricultural wastes, forestry wastes, livestock wastes and municipal solid wastes, statistics data from various organizations were collected and analyzed in this study. Also, space energy densities of each districts in Korea were calculated and analyzed. The results from the evaluation of biomass energy potential and space energy densities in Korea might be useful to estimate the availability of biomass energy conversion processes and to choice a appropriate process to convert domestic biomass into energy.
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국진우 ( Jin Woo Kook ),이시훈 ( See Hoon Lee ) 한국공업화학회 2015 공업화학 Vol.26 No.2
Biomass is recognized as one of important renewable energy sources because it can be converted and used as solid, gaseous and liquid forms. Also, biomass is one of promising ways to solve the depletion of fossil fuels and global warming problems. The information about local biomass energy potentials and space energy densities can be powerfully utilized to determine the scale of biomass energy conversion plant and to analyze economic effects. The latest data on domestic biomass resources, such as agricultural, forestry, livestock and urban wastes, were collected from various government organizations and institutes and were analyzed to calculate biomass energy potential and space energy density. As local areas in South Korea to collect biomass resources increased, energy potentials increased, but space energy densities of total biomass decreased.
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석유 코크스, 바이오매스, 혼합연료의 이산화탄소 가스화 반응 연구
국진우 ( Jin Woo Kook ),신지훈 ( Ji Hoon Shin ),곽인섭 ( In Seop Gwak ),이시훈 ( See Hoon Lee ) 한국공업화학회 2015 공업화학 Vol.26 No.2
Characteristics of Char-CO2 gasification for petroleum coke, biomass and mixed fuels were compared in the temperature range of 1,100∼1,400 ℃ using TGA (Thermogravimetric analyzer). Kinetic constants with respect to reaction temperature were determined by using different gas-solid reaction models. Also activation energy (Ea) and pre-exponential factors (K0) in each models were calculated by using Arrhenius equation and then were compared with experimental values to determine reaction rate equation for char-CO2 gasification. Reaction time for CO2 gasification decreased with an increase of reaction temperature. Also, the activation energy of CO2 gasification reaction for mixture with petroleum coke and biomass decreased with increasing biomass contents. This indicates that mixing with biomass could bring synergy effects on CO2 gasification reaction.
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0.1MW<sub>th</sub> 급 순환유동층에서의 무연탄 연소 전산유체역학 모사
고은솔 ( Eun Sol Go ),국진우 ( Jin Woo Kook ),서광원 ( Kwang Won Seo ),서수빈 ( Su Been Seo ),김형우 ( Hyung Woo Kim ),강서영 ( Seo Yeong Kang ),이시훈 ( See Hoon Lee ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.3
The combustion characteristics of anthracite, which follow a complex process with low reactivity, must be considered through the dynamic behavior of circulating fluidized bed (CFB) boilers. In this study, computational fluid dynamics (CFD) simulation was performed to analyze the combustion characteristics of anthracite in a pilot scale 0.1MW<sub>th</sub> Oxy-fuel circulating fluidized bed (Oxy-CFB) boiler. The 0.1MW<sub>th</sub> Oxy-CFB boiler is composed of combustor (0.15 m l.D., 10 m High), cyclone, return leg, and so on. To perform CFD analysis, a 3D simulation model reactor was designed and used. The anthracite used in the experiment has an average particle size of 1,070 μm and a density of 2,326 kg/㎥. The flow pattern of gas-solids inside the reactor according to the change of combustion environment from air combustion to oxygen combustion was investigated. At this time, it was found that the temperature distribution in air combustion and oxygen combustion showed a similar pattern, but the pressure distribution was lower in oxygen combustion. addition, since it has a higher CO<sub>2</sub> concentration in oxygen combustion than in air combustion, it can be expected that carbon dioxide capture will take place actively. As a result, it was confirmed that this study can contribute to the optimized design and operation of a circulating fluidized bed reactor using anthracite.
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김보화 ( Bo Hwa Kim ),서명원 ( Myung Won Seo ),국진우 ( Jin Woo Kook ),최희망 ( Hee Mang Choi ),라호원 ( Ho Won Ra ),윤상준 ( Sang Jun Yoon ),문태영 ( Tae Young Mun ),김용구 ( Yong Ku Kim ),이재구 ( Jae Goo Lee ),이영우 ( Young Wo 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.4
We investigate fluidization characteristics of the mixture of rice husk, silica sand and rice husk ash as a preliminary study for valuable utilization of rice husk ash obtained from gasification of rice husk in a fluidized bed reactor. As experiment valuables, the blending ratio of rice husk and sand (rice husk: sand) is selected as 5:95, 10:90, 20:80 and 30:70 on a volume base. Rice husk ash was added with 6 vol% of rice husk for each experiment and air velocity to the reactor was 0~0.63 m/s. In both rice husk/sand and rice husk/sand/ash mixture, the minimum fluidization velocity (Umf) is observed as 0.19~0.21 m/s at feeding of 0~10 vol.% of rice husk and 0.30 m/s at feeding of 20 vol.% of rice husk. With increasing the amount of rice husk up to 30 vol. %, Umf can not measure due to segregation behavior. The mixing index for each experiment is determined using mixing index equation proposed by Brereton and Grace. The mixing index of the mixture of rice husk/sand and rice husk/sand/ash was 0.8~1 and 0.88~1, respectively. The optimum fluidization condition was found for the good mixing and separation of rice husk ash.
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