Computational Analysis of Dynamic Tubular SOFC with a Built-in Chemical Iron Bed. (30th May 2017)

• Record Type: Journal Article
• Authors: Jin, Xinfang; Guo, Meng; White, Ralph E.; Huang, Kevin
• Is Part Of: ECS transactions. Volume 78:Number 1(2017)
• Page Start: 2683
• Page End: 2698
• Publication Date: 2017-05-30
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/07801.2683ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Solid oxide fuel cells (SOFCs) with enhanced fast ramping power capability and overload tolerance can find important applications in grid stability management and critical data center overload protection. Recently, we have demonstrated a new SOFC configuration featuring a built-in chemical Fe-bed in the anode chamber of a tubular SOFC with exceptional fast power ramping and overload tolerance. In the present study, we showed our theoretical understanding of the enhanced dynamic performance through a two-dimensional axial symmetrical numerical model. The model couples the charge and mass transport in the tubular SOFC with chemical reaction kinetics in the Fe-bed, producing longitudinal distributions of Nernst potential, H2 O/H2 molar ratio, local current density and fuel utilization under various operating conditions. The crucial role of Fe-bed in providing instant H2 to support fast ramping and overload currents has been explicitly explained by this computational model.