Abstract
Designing a configuration of an efficient solid oxide fuel cell (SOFC) system and operating it under appropriate conditions are important for achieving a highly efficient SOFC system. In our previous research, the system layout of a SOFC system with anode off-gas recirculation was suggested, and the system performance was examined using a numerical model. In the present study, the system operating conditions were optimized based on the system configuration and numerical model developed in the previous paper. First, a parametric sensitivity analysis of the system performance was investigated to demonstrate the main operating parameters. Consequently, the fuel flow rate and recirculation ratio were selected. Then, the available operating conditions, which keep the system below the operating limits and satisfy the desired system performance (Ufuel > 0.7 and ηelec > 45%) were discovered. Finally, optimized operating conditions were suggested for three operating modes: optimized electrical efficiency, peak power, and heat generation. Depending on the situation, the demand for electricity and heat can be different, so different proper operating points are suggested for each mode. Additionally, using the developed model and the conducted process of this study, various optimized operating conditions can be derived for diverse cases.
Highlights
Carbon-neutral technology issues have become a subject of special interest to cope with global climate change
An anode off-gas recirculation (AOGR) system can be adopted in the solid oxide fuel cell (SOFC) system as a method to enhance system performance
We evaluated the performance of the reference SOFC system and two different systems with AOGR
Summary
Carbon-neutral technology issues have become a subject of special interest to cope with global climate change. Solid oxide fuel cells (SOFCs) have received great attention as low-emission power generation devices. They have diverse advantages such as high electrical efficiency, eco-friendliness, and fuel flexibility [1,2,3]. There are still some barriers to commercialization, such as low durability, high cost, and low reliability To overcome these challenges, various reports have been published on improving system efficiency and finding control points that can ensure system safety [4,5]. Several studies about SOFC systems with AOGR have been conducted. A survey of literature on SOFC systems with AOGR was conducted in the paper [7]
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