• Title, Summary, Keyword: PID controller

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A Case Study of Different Configurations for the Performance Analysis of Solid Oxide Fuel Cells with External Reformers (외부 개질형 평판형 고체 산화물 연료전지 시스템 구성법에 따른 효율특성)

  • Lee, Kang-Hun;Woo, Hyun-Tak;Lee, Sang-Min;Lee, Young-Duk;Kang, Sang-Gyu;Ahn, Kook-Young;Yu, Sang-Seok
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.3
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    • pp.343-350
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    • 2012
  • A planar solid oxide fuel cell (PSOFC) is studied in its application in a high-temperature stationary power plant. Even though PSOFCs with external reformers are designed for application from the distributed power source to the central power plant, such PSOFCs may sacrifice more system efficiency than internally reformed SOFCs. In this study, modeling of the PSOFC with an external reformer was developed to analyze the feasibility of thermal energy utilization for the external reformer. The PSOFC system model includes the stack, reformer, burner, heat exchanger, blower, pump, PID controller, 3-way valve, reactor, mixer, and steam separator. The model was developed under the Matlab/Simulink environment with Thermolib$^{(R)}$ modules. The model was used to study the system performance according to its configuration. Three configurations of the SOFC system were selected for the comparison of the system performance. The system configuration considered the cathode recirculation, thermal sources for the external reformer, heat-up of operating gases, and condensate anode off-gas for the enhancement of the fuel concentration. The simulation results show that the magnitude of the electric efficiency of the PSOFC system for Case 2 is 12.13% higher than that for Case 1 (reference case), and the thermal efficiency of the PSOFC system for Case 3 is 76.12%, which is the highest of all the cases investigated.