Simplified Versus Detailed SOFC Reactor Models and Influence on the Simulation of the Design Point Performance of Hybrid Systems

2002 ◽  
Author(s):  
Loredana Magistri ◽  
Riccardo Bozzo ◽  
Paola Costamagna ◽  
Aristide F. Massardo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Hybrid Systems ◽  
Gas Turbines ◽  
High Efficiency ◽  
Solid Oxide ◽  
Simplified Model ◽  
Oxide Fuel ◽  
Detailed Model ◽  
Design Point ◽  
Reactor Models

High efficiency Hybrid Systems (HS) based on the coupling of Solid Oxide Fuel Cells (SOFCs) and Gas Turbines (GT) are analysed in this paper through the use of two different approaches: simplified and detailed SOFC models. The simplified model, already presented by the Authors1, is very useful for HS design and off-design analysis. The detailed model, developed by the Authors2 and verified through the use of available experimental data, allows the complete description of the SOFC reactor’s internal behaviour to be obtained. The detailed model can also be utilised for HS modelling. Both models are presented and discussed in this paper, and they are compared to each other. The results obtained for the stand-alone SOFC reactor, and the HS design point configuration are presented and carefully discussed, also taking into account the non linear SOFC response.

Simplified Versus Detailed Solid Oxide Fuel Cell Reactor Models and Influence on the Simulation of the Design Point Performance of Hybrid Systems

2004 ◽  
Vol 126 (3) ◽  
pp. 516-523 ◽  
Author(s):  
Loredana Magistri ◽  
Riccardo Bozzo ◽  
Paola Costamagna ◽  
Aristide F. Massardo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Hybrid Systems ◽  
Gas Turbines ◽  
High Efficiency ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Detailed Model ◽  
Design Point ◽  
Cell Reactor ◽  
Reactor Models

High-efficiency hybrid systems (HS) based on the coupling of solid oxide fuel cells (SOFCs) and gas turbines (GT) are analyzed in this paper through the use of two different approaches: simplified and detailed SOFC models. The simplified model, already presented by the authors, is very useful for HS design and off-design analysis. The detailed model, developed by the authors and verified through the use of available experimental data, allows the complete description of the SOFC reactor’s internal behavior to be obtained. The detailed model can also be utilized for HS modeling. Both models are presented and discussed in this paper, and they are compared to each other. The results obtained for the stand-alone SOFC reactor, and the HS design point configuration are presented and carefully discussed, also taking into account the nonlinear SOFC response.

Design and Off-Design Analysis of a MW Hybrid System Based on Rolls-Royce Integrated Planar Solid Oxide Fuel Cells

2007 ◽  
Vol 129 (3) ◽  
pp. 792-797 ◽  
Author(s):  
Loredana Magistri ◽  
Michele Bozzolo ◽  
Olivier Tarnowski ◽  
Gerry Agnew ◽  
Aristide F. Massardo
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Hybrid System ◽  
System Size ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ambient Conditions ◽  
Detailed Model ◽  
Design Point ◽  
Turbine Speed

In this paper the design point definition of a pressurised hybrid system based on the Rolls-Royce Integrated Planar-Solid Oxide Fuel Cells (IP-SOFCs) is presented and discussed. The hybrid system size is about 2 MWe and the design point analysis has been carried out using two different IP-SOFC models developed by Thermochemical Power Group (TPG) at the University of Genoa: (i) a generic one, where the transport and balance equations of the mass, energy and electrical charges are solved in a lumped volume at constant temperature; (ii) a detailed model where all the equations are solved in a finite difference approach inside the single cell. The first model has been used to define the hybrid system lay out and the characteristics of the main devices of the plant such as the recuperator, the compressor, the expander, etc. The second model has been used to verify the design point defined in the previous step, taking into account that the stack internal temperature behavior are now available and must be carefully considered. Apt modifications of the preliminary design point have been suggested using the detailed IP-SOFC system to obtain a feasible solution. In the second part of the paper some off-design performance of the Hybrid System carried out using detailed SOFC model are presented and discussed. In particular the influence of ambient conditions is shown, together with the possible part load operations at fixed and variable gas turbine speed. Some considerations on the compressor surge margin modification are reported.

An easy and innovative method based on spray-pyrolysis deposition to obtain high efficiency cathodes for Solid Oxide Fuel Cells

2016 ◽  
Vol 319 ◽  
pp. 48-55 ◽  
Author(s):  
L. dos Santos-Gómez ◽  
J.M. Porras-Vázquez ◽  
F. Martín ◽  
J.R. Ramos-Barrado ◽  
E.R. Losilla ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Spray Pyrolysis ◽  
High Efficiency ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Innovative Method ◽  
Spray Pyrolysis Deposition

A Simplified Model for Reversible Solid Oxide Fuel Cells

2021 ◽  
Vol MA2021-03 (1) ◽  
pp. 145-145
Author(s):  
Hayri Sezer ◽  
Jerry H Mason ◽  
Ismail Bektas Celik ◽  
Yueying Fan ◽  
Harry W. Abernathy ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Simplified Model ◽  
Oxide Fuel

Achieving Performance and Longevity with Butane-operated Low-temperature Solid Oxide Fuel Cells using Low-Cost Cu and CeO2 Catalysts

2021 ◽  
Author(s):  
Cam-Anh Thieu ◽  
Sungeun Yang ◽  
Ho-Il Ji ◽  
Hyoungchul Kim ◽  
Kyung Joong Yoon ◽  
...  
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
High Efficiency ◽  
Operating Temperature ◽  
Low Cost ◽  
Solid Oxide ◽  
Oxide Fuel

Thin-film solid oxide fuel cells (TF-SOFCs) effectively lower the operating temperature of typical solid oxide fuel cells (SOFCs) below 600 °C, while maintaining high efficiency and using low-cost catalyst. But...

Comparison of Solid Oxide Fuel Cell Stack Performance Using Detailed and Simplified Models

2013 ◽  
Author(s):  
R. T. Nishida ◽  
S. B. Beale ◽  
J. G. Pharoah
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Computational Cost ◽  
Transport Equations ◽  
Solid Oxide ◽  
Simplified Model ◽  
Oxide Fuel ◽  
Simplified Models ◽  
Detailed Model ◽  
Fuel Cell Stack

Two computational fluid dynamics models have been developed to predict the performance of a solid oxide fuel cell stack, a detailed and a simplified model. In the detailed model, the three dimensional momentum, heat, and species transport equations are coupled with electrochemistry. In the simplified model, the diffusion terms in the transport equations are selectively replaced by rate terms within the core region of the stack. This allows much coarser meshes to be employed at a fraction of the computational cost. Following the mathematical description of the problem, results for a single cell and multi-cell stack are presented. Comparisons of local current density, temperature, and cell voltage indicate that good agreement is obtained between the detailed and simplified models, confirming the validity of the latter as a practical option in stack design.

Full Load and Part-Load Performance Prediction for Integrated SOFC and Microturbine Systems

2000 ◽  
Vol 122 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Stefano Campanari
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electric Power ◽  
Performance Prediction ◽  
High Efficiency ◽  
Calculation Model ◽  
Solid Oxide ◽  
Small Scale ◽  
Oxide Fuel ◽  
Part Load ◽  
Small Capacity

During the last years, two new subjects among the others have raised interest in the field of small scale electric power generation: advanced microturbines and solid oxide fuel cells. This paper investigates the thermodynamic potential of the integration of the solid oxide fuel cell technology with microturbine systems, in order to obtain ultra-high efficiency small capacity plants, generating electric power in the range of 250 kW with 65 percent LHV net electrical efficiency and with the possibility of cogenerating heat. A detailed description of the calculation model is presented, capable of full and part-load performance analysis of the microturbine and of the integrated SOFC+microturbine system. [S0742-4795(00)01702-6]

Efficiency Evaluation of Solid-Oxide Fuel Cells in Combined Cycle Operations

2009 ◽  
Vol 6 (2) ◽  
Author(s):  
C. M. Colson ◽  
M. H. Nehrir ◽  
M. C. Deibert ◽  
M. R. Amin ◽  
C. Wang
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
High Efficiency ◽  
Combined Cycle ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Modeling Simulation ◽  
Semi Empirical ◽  
Energy Conversion Devices ◽  
Capacity Method

Solid oxide fuel cells (SOFCs) are high-temperature, high-efficiency, combustionless electrochemical energy conversion devices that have potential for combined cycle applications. This paper intends to clarify and expand the efficiency discussions related to SOFC when operating in combined cycle (CC) systems. A brief analysis of the first and second thermodynamic laws is conducted and, building upon a previously developed SOFC dynamic model, operating fuel heating values are determined by utilizing the semi-empirical gas phase heat capacity method. As a result, accurate SOFC stack operational simulations are conducted to calculate its efficiency based on actual thermodynamic parameters. Furthermore, an analysis is conducted of a combined SOFC-CC system using dynamic modeling. Simulation results are given, which are intended to aid researchers in evaluating hybrid SOFC-CC generation systems.

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