scholarly journals Model-Based System Performance Analysis of a Solid Oxide Fuel Cell System with Anode Off-Gas Recirculation

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3607
Author(s):  
Eun-Jung Choi ◽  
Sangseok Yu ◽  
Ji-Min Kim ◽  
Sang-Min Lee
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
System Performance ◽  
Reference System ◽  
High Efficiency ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
System Configurations ◽  
Gas Recirculation

Designing proper solid oxide fuel cell (SOFC) system configurations is essential for their high efficiency. The present study analyzes the performance improvement of the SOFC system with anode off-gas recirculation (AOGR). Two AOGR configurations are suggested. Depending on the heat flows of off gases, the configurations are called AOGR #1 and #2, respectively. Additionally, a reference system is examined for comparison. This study aims to numerically evaluate the characteristics and performance of each system under various operating conditions such as fuel and air utilization factors. The operating current density and steam to carbon ratio are fixed at 0.3 A/cm2 and 2.5, respectively. The results indicate that the system performance shows a large difference depending on the system configurations. The SOFC system with AOGR has better performance than the reference system under the operating conditions considered in this paper. However, it is also revealed that depending on the system configuration and operating conditions, AOGR can be effective or ineffective for system performance. Therefore, a deliberate operating strategy for AOGR systems needs to be developed based on the load conditions.

Analysis of Electrochemical Performance and Exergy Loss in Solid Oxide Fuel Cell

2003 ◽  
Author(s):  
Kousuke Nishida ◽  
Toshimi Takagi ◽  
Shinichi Kinoshita
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Gas Turbine ◽  
High Efficiency ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Exergy Loss ◽  
Oxide Fuel ◽  
Electrode Reactions ◽  
Exhaust Heat

A solid oxide fuel cell (SOFC) is expected to be applied to the distributed energy systems because of its high thermal efficiency and exhaust gas utilization. The exhaust heat from the SOFC can be transferred to the electric power by a gas turbine, and the high efficiency power generation can be achieved by constructing the SOFC and gas turbine hybrid system. In this study, the local processes in the electrodes and electrolyte of unit SOFC are analyzed taking into account the heat conduction, mass diffusion, electrode reactions and the transport of electron and oxygen ion. The temperature and concentration distributions perpendicular to the electrolyte membrane are shown. The effects of the operating conditions on the cell performance are also shown. Furthermore, the entropy generation and exergy loss of each process in the electrodes and electrolyte are analyzed and the reason for generating the exergy loss in the SOFC is clarified. It is noted that two electrode reactions are responsible for the major exergy loss.

Demonstration of high efficiency intermediate-temperature solid oxide fuel cell based on lanthanum gallate electrolyte

2006 ◽  
Vol 408-412 ◽  
pp. 512-517 ◽  
Author(s):  
Toru Inagaki ◽  
Futoshi Nishiwaki ◽  
Jirou Kanou ◽  
Satoru Yamasaki ◽  
Kei Hosoi ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
High Efficiency ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Lanthanum Gallate ◽  
Oxide Fuel

A Simulation of the Solid Oxide Fuel Cell Electrochemical Light Off Phenomenon

2005 ◽  
Author(s):  
Comas L. Haynes ◽  
J. Chris Ford
Keyword(s):  
Fuel Cell ◽  
Thermal Cycling ◽  
Solid Oxide Fuel Cell ◽  
Heat Generation ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Cell Potential ◽  
Start Up ◽  
Electrochemical Transport

During latter-stage, “start-up” heating of a solid oxide fuel cell (SOFC) stack to a desired operating temperature, heat may be generated in an accelerating manner during the establishment of electrochemical reactions. This is because a temperature rise in the stack causes an acceleration of electrochemical transport given the typical Arrhenius nature of the electrolyte conductivity. Considering a potentiostatic condition (i.e., prescribed cell potential), symbiosis thus occurs because greater current prevalently leads to greater by-product heat generation, and vice versa. This interplay of the increasing heat generation and electrochemistry is termed “light off”, and an initial model has been developed to characterize this important thermal cycling phenomenon. The results of the simulation begin elucidating the prospect of using cell potential as well as other electrochemical operating conditions (e.g., reactants utilization) as dynamic controls in managing light off transients and possibly mitigating thermal cycling issues.

Comparisons of the system performance for the small solid oxide fuel cell applications

2010 ◽  
Vol 10 (2) ◽  
pp. S29-S33 ◽  
Author(s):  
Youngseok Jee ◽  
Seyun Lah ◽  
Ji-Won Son ◽  
Suk Won Cha
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
System Performance ◽  
Solid Oxide ◽  
Oxide Fuel
Sign in / Sign up

Export Citation Format

Share Document