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이종준(Lee, J.J.),차규상(Cha, K.S.),손정락(Sohn, J.L.),김동섭(Kim, T.S.) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed with hydrogen and carbon monoxide, by the gasification process and produces electric power by the gas and steam turbine combined cycle power plant. The purpose of this study is to investigate the influence of the syngas to the performance of a gas turbine in a combined cycle power plant. For this purpose, a commercial gas turbine is selected and its performance characteristics are analyzed with syngas. It is found that different heating values of those fuels and chemical compositions in their combustion gases are the causes in the different performance characteristics. Also, Changing of turbine inlet Mass flow lead to change the turbine matching point, in the event the pressure ratio is changed.
비정렬 유한체적법을 이용한 유동장 내의 연료액적 증발 특성 해석
김태준 ( T. J. Kim ),김용모 ( Y. M. Kim ),손정락 ( J. L. Sohn ) 한국액체미립화학회 2000 한국액체미립화학회지 Vol.5 No.1
The present study has numerically analyzed the vaporization characteristics of fuel droplets in the high temperature convective flow field. The axisymmetric governing equations for mass, momentum, energy, and species are solved by an iterative and implicite unstructured finite-volume method. The moving boundary due to vaporization is handled by the deformable unstructured grid technique. The pressure-velocity coupling in the density-variable flows is treated by the SIMPLEC algorithm. In terms of the matrix solver, Bi-CGSTAB is employed for the numerically efficient and stable convergence. The n-decane is used as a liquid fuel and the initial droplet temperature is 300K. Computations are performed for the nonevaporating and evaporating droplets with the relative interphase velocity(25m/s). The unsteady vaporization process has been simulated up to the nondimensional time, 25. Numerical results indicate that the mathematical model developed in this study succesfully simulates the main features of the droplet vaporization process in the convective environment.
Modeling for the Performance Analysis of a Tubular SOFC/MGT Hybrid Power System
T. W. Song(송태원),J. L. Sohn(손정락),J. H. Kim(김재환),T. S. Kim(김동섭),S. T. Ro(노승탁),K. Suzuki 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Performance of a solid oxide fuel cell (SOFC) can be enhanced by converting thermal energy of its high temperature exhaust gas to mechanical power using a micro gas turbine (MGT). A MGT plays also an important role to pressurize and warm up inlet gas streams of the SOFC. In this study, the influence of performance characteristics of the tubular SOFC on the hybrid power system is discussed. For this purpose, detailed heat and mass transfer with reforming and electrochemical reactions in the SOFC are mathematically modeled, and their results are reflected to the performance analysis. The analysis target is 220kWe SOFC/MGT hybrid system based on the tubular SOFC developed by Siemens-Westinghouse. Special attention is paid to the ohmic losses in the tubular SOFC counting not only current flow in radial direction, but also current flow in circumferential direction through the anode and cathode.
가압형 고체산화물 연료전지 / 가스터빈 하이브리드 시스템 설계에서 터빈입구 바이패스의 효과
박성구(S. K. Park),손정락(J. L. Sohn),김동섭(T. S. Kim) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
Hybrid power generation systems combining a solid oxide fuel cell and a gas turbine is promising due to their high efficiency. In the pressurized hybrid system, the operating condition of the gas turbine may play a critical role in designing the hybrid system. In particular, prevention of surge of the compressor can be a critical issue. The existence of fuel cell between the compressor and the turbine may cause an additional pressure loss and thus compressor operating points tend to approach the surge if the original turbine inlet temperature is pursued. In this study, bypassing some of the turbine inlet gas directly to the turbine exit side is simulated. Its effects on suppressing the surge problem and change in performance characteristics are discussed.
Syngas 및 수소연료를 이용한 복합화력발전 성능해석
차규상(K.S. Cha),이종준(J.J. Lee),손정락(J.L. Sohn),김동섭(T.S. Kim),주용진(Y.J. Joo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In addition to natural gas, various gaseous fuels can be used as fuel in the combined cycle power plant. A typical example is the syngas produced by the gasification of coal. The gasification enables effective and environment friendly utilization of the coal that is the most abundant fossil fuel. When the fuel is converted from the natural gas to the syngas, the gas turbine operating condition and performance will be changed, because gas flow increases due to increased fuel flow and the gas property changes as well. Those factors affect the design performance of the bottoming cycle that increases the bottoming cycle power and combined cycle efficiency. Increasing hydrogen composition of the syngas increases the cycle performance only slightly. In this study, The design performance of the bottoming cycles based on natural gas and a typical syngas as well as pure hydrogen have been comparatively analysed.
소형 가압형 연료전지/가스터빈 하이브리드 시스템의 성능 비교 해석
박성구(S. K. Park),유병준(B. J. You),김동섭(T. S. Kim),손정락(J. L. Sohn),이영덕(Y. D. Lee),안국영(K. Y. Ahn) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
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. Typical design parameter of PEMFC and SOFC of 10kW class are assumed. By varying the turbine inlet temperature of the gas turbine, efficiency upgrade due to the hybridization is estimated for the two systems. The SOFC is predicted to exhibit not only a better fuel cell efficiency but also a greater efficiency upgrade through the hybridization. For both systems, increasing the turbine inlet temperature increases the power portion of the gas turbine, but decreases the system efficiency.
김영식(Y. S. Kim),김동섭(T. S. Kim),손정락(J. L. Sohn),김시문(S. M. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In IGCC plants, operating characteristics of a gas turbine change due to design options such as the integration between the gasification process and the gas turbine. Problems of compressor surge margin reduction and turbine metal overheating may occur in low integration degree region. The syngas composition also affects the gas turbine operation. According to gasification process and kinds of coal, syngas compositions vary. Moreover, when carbon capture and storage is applied to the gasification process, syngas composition changes very much. This study examines the influence of syngas composition on the operating characteristics of a gas turbine. Four different syngases are considered as fuels of a gas turbine. As the heating value of syngas gets lower, the problems of surge margin reduction and metal overheating become worse. It is suggested that according to each syngas composition, integration degree of gas turbine and gasification process should be designed differently.