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스팀분사를 고려한 SOFC/GT 하이브리드 시스템의 설계 성능비교 분석
박성구(Sung Ku Park),김동섭(Tong Seop Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study aims to analyse the influence of steam injection on the performance of hybrid systems combining a solid oxide fuel cell and a gas turbine. The steam is generated by recovering heat from the exhaust gas. Two system configurations, with difference being the operating pressure of the SOFC, are examined and effects of steam injection on performances of the two systems are compared. Two representative gas turbine pressure ratios are simulated and a wide range of both the fuel cell temperature and the turbine inlet temperature is examined. Without steam injection, the pressurized system generally exhibits better system efficiency than the ambient pressure system. Steam injection increases system power capacity for all design cases. However, its effect on system efficiency varies much depending on design conditions. The pressurized system hardly takes advantage of the steam injection in terms of the system efficiency. On the other hand, steam injection contributes to the efficiency improvement of the ambient pressure system in some design conditions. A higher pressure ratio provides a better chance of efficiency increase due to steam injection.
이산화탄소 분리를 고려한 IG-SOFC/GT 시스템의 성능
박성구(Sung Ku Park),김동섭(Tong Seop Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
IG-SOFC/GT (Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine) power generation systems considering CO₂ separation are devised and their performances are analyzed and compared with IGCC and various IG-SOFC/GT systems. First, the modeling of the IGCC system combining a gasifier block and G-class gas turbine based power block is performed on the basis of an open literature. Then, IG-SOFC/GT systems are designed through the integration of a SOFC and the IGCC system. Two system configurations, differing in the disposal of nitrogen separated from the air separation unit, are compared. Finally, IG-SOFC/GT systems considering two CO₂ separation methods are compared. General conclusion is that almost all IG-SOFC/GT system can produce much larger power with a higher efficiency than IGCC system, and IG-SOFC/GT system with oxy combustion exhibits a better system efficiency but produces lower power than the system using pre-combustion .
소형 가압형 연료전지/가스터빈 하이브리드 시스템의 성능 비교해석
박성구(Sung Ku Park),유병준(Byung June You),김동섭(Tong Seop Kim),손정락(Jeong L. Sohn),안국영(Kook Young Ahn) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.9
Design performances of the fuel cell / gas turbine hybrid power generation systems based on two different fuel cells (PEMFC, SOFC) have been comparatively analyzed. In each system, the fuel cell operates at an elevated pressure corresponding to the compressed air pressure of the gas turbine. Both internally and externally reformed systems were analyzed for the SOFC hybrid system. Component design parameters of 10㎾ class small systems are assumed. For all hybrid systems, increasing the turbine inlet temperature increases the power portion of the gas turbine. With increasing the turbine inlet temperature, system efficiency decreases in the PEMFC system and the internally reformed SOFC system while that of the externally reformed SOFC system increases slightly. The internally reformed SOFC hybrid system is predicted to exhibit the best system efficiency.
IGCC를 기본으로 하는 IG-SOFC/GT 시스템의 성능
박성구(Sung Ku Park),김동섭(Tong Seop Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
An IG-SOFC/GT (Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine) power generation system based on IGCC (Integrated Gasification Combined Cycle) is devised and its performance is analyzed and compared with IGCC system performance. First, the modeling of the IGCC system combining a gasifier block and G-class gas turbine based power block is performed on the basis of an open literature. Then, IG-SOFC/GT system is designed through the integration of a SOFC and the IGCC system. Three system configurations, differing in SOFC inlet temperature management and disposal of notrogen separated from the air separation unit, are compared. General conclusion is that the IG-SOFC/GT system can produce much larger power with a higher efficiency than IGCC system.
산소분리기술을 사용한 연료전지/순산소연소 발전시스템 해석
박성구(Park, Sung-Ku),김동섭(Kim, Tong-Seop),손정락(Sohn, Jeong-Lak),이영덕(Lee, Young-Duk) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
This study aims to devise and analyze a power generation system combining the solid oxide fuel cell and oxy-fuel combustion technology. The fuel cell operates at an elevated pressure, a constituting a SOFC/gas turbine hybrid system. Oxygen is extracted from the high pressure cathode exit gas using ion transport membrane technology and supplied to the oxy-fuel power system. The entire system generates much more power than the fuel cell only system due to increased fuel cell voltage and power addition from oxy-fuel system. More than one third of the power comes out of the oxy-fuel system. The system efficiency is also higher than that of the fuel cell only system. Recovering most of the generated carbon dioxide is major advantage of the system.
ASU 와 연계를 고려한 IGCC 용 가스터빈의 성능 예측
박성구(Sung Ku Park),김유석(You Seok Kim),백민수(Min Su Paek) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The construction plan of 300MW-class IGCC plant has been pushed ahead on the Taean thermal power plant site in Korea. The integration of gas turbine and air separation unit has a significant effect on the performance and the stability of the IGCC plant. In this paper, the influence of the integration with gas turbine and air separation unit has been analyzed using commercial code(GateCycle) and in-house code(visual Basic) for the process design of gas turbine and air separation unit, respectively. To achieve an acceptable surge margin of the gas turbine, the air extraction from compressor exit and the extension of turbine nozzle area were considered. As the extraction air from compressor increases, the surge margin also increases. Furthermore, it is expected to be able to secure surge margin through the extension of turbine nozzle area. If the turbine nozzle area increases by 19.4%, the surge margin is analyzed to be similar to a design surge margin of gas turbine for natural gas. The mass flow of extraction air is limited by the operation constraints such as turbine (rotor) inlet temperature and the allowable integration degree was predicted to be about 35%. At this integration degree, the power consumption of air separation unit and the integrated system efficiency were analyzed to be about 45MW and 31%, respectively.