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저온 평판형 고체산화물 연료전지 내부 열 및 물질전달 현상에 대한 전산해석
정희석(Jeong, Hee-Seok),차훈(Cha, Hoon),손정락(Sohn, Jeong-Lak),노승탁(Ro, Sung-Tack) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
The performance prediction of a planar-type solid oxide fuel ceil is conducted by a computational analysis. The transport processes are formulated with the help of a simplified treatment of heat generation by the electrochemical reaction. From the result of the computational analysis, it is shown that the electrochemical reaction is closely related to the transport phenomena inside a solid oxide fuel cell. Transport phenomena including heat and mass transfer have influence on the distribution of local current density and as a result, on the performance characteristics of the fuel cell. Computational analysis is also extended to the parametric study to investigate the performance behavior of the fuel cell with different amount of supplied fuel flow rates. It is also demonstrated that the mathematical formulation and computational procedures proposed in this study can be applied to prove the importance of the specific TPB(Three-Phase-Boundary) area in the manufacturing process of electrodes in a solid oxide fuel cell.
병렬 컴퓨터에서 다중블록 유한체적법을 이용한 비압축성 유동해석
강동진,손정락,Kang, Dong-Jin,Sohn, Jeong-Lak 한국유체기계학회 1998 한국유체기계학회 논문집 Vol.1 No.1
Computational analysis of incompressible flows by numerically solving Navier-Stokes equations using multi-block finite volume method is conducted on a parallel computing system. Numerical algorithms adopted in this study $include^{(1)}$ QUICK upwinding scheme for convective $terms,^{(2)}$ central differencing for other terms $and^{(3)}$ the second-order Euler differencing for time-marching procedure. Structured grids are used on the body-fitted coordinate with multi-block concept which uses overlaid grids on the block-interfacing boundaries. Computational code is parallelized on the MPI environment. Numerical accuracy of the computational method is verified by solving a benchmark test case of the flow inside two-dimensional rectangular cavity. Computation in the axial compressor cascade is conducted by using 4 PE's md, as results, no numerical instabilities are observed and it is expected that the present computational method can be applied to the turbomachinery flow problems without major difficulties.
전기화학 반응에 의한 생성 열의 단순화된 처리 기법을 이용한 평판형 고체산화물 연료전지 내부의 이동현상에 대한 전산 해석
차훈,손정락,노승탁,Cha, Hoon,Sohn, Jeong-Lak,Ro, Sung-Tack 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.12
For the performance prediction of a planar-type solid oxide fuel cell, the computational analysis of transport phenomena with a simplified treatment of heat generation by the electrochemical reaction is conducted. From the result of the computational analysis, it is shown that the electrochemical reaction is closely related to the transport phenomena inside a solid oxide fuel cell. Transport phenomena including heat and mass transfer influences on the distribution of local current density and, as a result, on the performance characteristics of the fuel cell. Computational analysis is also extended to the parametric study to investigate the performance behavior of the fuel cell with different amount of supplied fuel flow rates. It is also demonstrated that the mathematical formulation and computational procedures proposed in this study can be applied to prove the importance of the specific TPB area in the manufacturing process of electrodes in solid oxide fuel cells.
합성가스를 연료로 사용하는 고체산화물연료전지-가스터빈 하이브리드 시스템의 탈설계점 성능 특성
최정일(Jungil Choi),손정락(Jeong Lak Sohn),송성진(Seung Jin Song),김동섭(Tong Seop Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.3
가스화기를 장착한 고체산화물연료전지와 가스터빈의 하이브리드 시스템의 사전 연구로서 합성가스에서 수소와 일산화탄소의 구성이 하이브리드 시스템의 성능특성에 미치는 영향을 조사하였다. 이때 다른 구성요소와 다른 발열량을 가진 연료의 특성이 가스터빈의 탈설계점 운전을 유발하여 결과적으로 전체 하이브리드 시스템의 다른 성능 특성을 야기할 것으로 예상된다. 합성가스의 구성요소가 고체산화물연료전지의 성능에 영향을 준다는 것과 일산화탄소를 사용하는 하이브리드 시스템의 성능이 수소를 사용하는 것보다 나쁘다는 것이 발견되었다. 부분부하 성능에서는 수소를 사용하는 경우 부분부하 운전시에 성능 저하가 일산화탄소의 경우보다 더 현저하였다. As a preliminary study on a SOFC-GT hybrid system integrated a with coal-gasification system, the influence of the concentrations of H₂ and CO in syngas on the performance characteristics of the hybrid system is investigated. It is expected that the differences in the heating values of fuels with different compositions trigger the offdesign operation of the gas turbine and result in different performance characteristics of the overall hybrid system. Syngas compositions are found to affect the SOFC performance. Performance of hybrid system with carbon monoxide is poorer than the case with hydrogen. In the case of part-load performance with syngas, performance degradation at part-load operating conditions with hydrogen is more dominant than the case with carbon monoxide.
평판형 고체산화물 연료전지의 유로 설계변수에 따른 성능비교를 위한 유동 해석 연구
이대호(Dae Ho Lee),손정락(Jeong Lak Sohn),노승탁(Sung Tack Ro) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Solid oxide fuel cell (SOFC) is expected to be a promising candidate for the power source in the next generation due to its high efficiency, utilization of high-temperature waste heat and low emission of pollutant to the environment. SOFC is, however, very sensitive to thermal stress because of its high operating temperature. In this study, three-dimensional CFD analyses are conducted to investigate the influence of flow pattern in the performance of a planar SOFC. Numerical results show that the temperature increases along the flow direction in the co-flow case and the temperature profile has a peak near the fuel inlet in the counter-flow case. Simulations of staggered flow channel model prove that overall performance is almost the same as that of unstaggered one although local distribution of current density is different.
물을 재순환하는 순산소 발전 시스템의 작동조건 변화에 따른 성능해석
박병철(Byung Chul Park),손정락(Jeong Lak Sohn),김동섭(Tong Seop Kim),안국영(Kook Young Ahn),강신형(Shin Hyoung Kang),이영덕(Young Duk Lee) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.1
본 연구에서는 물을 재순환하는 이상적인 순산소 발전시스템의 작동조검 변화에 따른 성능해석을 수행하였다. 순산소 발전시스템에서의 터빈은 작동유체의 연소기 출구온도에 따라 증기터빈 또는 가스터빈을 사용할 수 있다. 본 연구의 순산소 사이클에서는 터빈입구온도를 가스터빈 수준으로 가정하였으며, 터빈출구의 과열도 증대를 위해 재열시스템을 채택하였다. 또한 터빈출력 증대를 위해 터빈출구 압력을 진공상태로 가정하였으며, 이에 따라 가스터빈 출구에서 추가의 팽창과정이 요구된다. 터빈입구온도, 압력비, 응축기압력과 같은 중요 작동 조건의 변화에 따른 시스템 성능이 해석되었으며, 시스템구성 변화에 따른 효율 변화도 검토하였다. 결론에서는 성능을 최적화시키면서 고순도의 이산화탄소 회수가 가능한 순산소 발전시스템의 최적 작동조건을 제안하였다. In this study, an ideal water-recirculated oxy-fuel power generation system is proposed. The results of parametric studies of the performance characteristics of the system are discussed. For a given choice of the turbine inlet temperature, the turbine, which produces power, can be either a gas or a steam turbine. For maximum efficiency, the turbine inlet temperature is selected as the level of state-of-the-art gas turbines and the reheat cycle may be adopted not only to enhance the turbine power but also to maintain dryness of the water with a turbine exhaust temperature that is as high as possible. To obtain a low condensation temperature for a high purity of CO₂, a relatively low pressure expansion process may be added. Finally, the performance of the water-recirculated oxy-fuel power generation system is discussed with reference to various operating parameters and system configurations. The optimal operating conditions for high performance and a high purity of CO₂ are proposed.