Analysis of Proton/Oxygen-Ion Conducting Solid Oxide Fuel Cell Systems with an External Reformer

具外部重組器之質子／氧離子傳導固態氧化物燃料電池系統分析

張勳承(Shing-Cheng Chang) ； 林恆如(Heng-Ju Lin) ； 楊証皓(Cheng-Hao Yang) ； 張文昇(Wen-Sheng Chang) ； 李勝偉(Sheng-Wei Li) ； 劉倉榮(Cang-Rong Liu)

《中國機械工程學刊》 38卷6期 (2017/12) Pp. 597-603

摘要

The numerical simulations of the proton and oxygen-ion conducting solid oxide fuel cell systems are implemented in this study. The polarization losses and cell performance under different operating conditions and fuel utilization rates are analyzed. The applicability of the intermediate-temperature pSOFC and high-temperature oSOFC are verified by the model of 1.2kW stacks. The efficiency of a SOFC system with the hot box components including afterburner, heat exchanger and external reformer is simulated. Due to the proton conduction effects, the efficiency of a methane fed pSOFC system is significantly affected by an excessive incoming fuel flow rate. Analogously, the oSOFC system is found to be more sensitive to the air flow rate than the pSOFC system. The results of this work provide the guidelines of operating conditions for the 1kW oSOFC and pSOFC systems under the fuel utilization of 65%, 75% and 85%.

關鍵字

Solid oxide fuel cell ； Proton Conductor ； Fuel utilization ； Methane reformer

並列摘要

本研究建立質子和氧離子傳導固態氧化物燃料電池的理論模型，藉由Matlab軟體的Thermolib模擬工具，來計算不同操作條件與燃料利用率時，電池之發電效能與極化損失等特性。透過後燃器、熱交換器、氣體預加熱器、以及重組器等SOFC熱箱組件的配置，進行具熱回收機制之SOFC系統效能分析。研究結果除了驗證兩種SOFC系統分別適用於中溫(pSOFC)和高溫(oSOFC)操作條件外，也探討燃料與空氣流率對兩種系統效率的影響。研究結果指出過量的燃料流率會大幅降低pSOFC的性能，相對的，空氣流率的多寡則對oSOFC系統的影響較大。藉由本研究之模擬與分析結果，可提供1kW oSOFC和pSOFC系統在燃料利用率為65%，75%和85%下，發電運轉操作條件設計之參考。