Simulation and Analysis of Multi-scale Transport Phenomena and Catalytic Reactions in SOFC Anodes
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Jinliang Yuan
Solid oxide fuel cell (SOFC) has been considered as one of the most efficient power generation devices for the coming decades. There are various physical phenomena appearing in SOFC in multi-length and -time scales, such as multi-component gas-phase species/charge flow, thermal energy and mass transfer. Meanwhile, generation and consumption of gas- and surface-phase species together with electric current production are involved at various active sites. Catalytic reforming reactions of hydrocarbon fuels in SOFC anode are strongly coupled with the transport processes making the physical phenomena more complicated.An effective SOFC electrode design is to correctly balance each of the transport processes and the involved reactions. To deeply understand the multi-scale chemical reactions and transport processes in the anode, a fully three-dimensional numerical calculation method (CFD approach) is further developed and applied. The calculated domain includes the porous anode, fuel gas flow channel and the solid interconnects.By calculating fractions of Ni catalyst vacancies and surface-phase species coverages, the gas-phase species/heat generation and consumption related to the internal reforming reactions of methane and the electrochemical reactions of hydrogen have been implemented. The variable thermal-physical properties and transport parameters of the fuel gas mixture have also been taken into account. Furthermore, the heat transfer due to the fuel gas diffusion is implemented into the energy balance based on multi-component diffusion models. A multi-step heterogeneous steam reforming reaction mechanism based on the micro and detailed reaction mechanisms of Ni/YSZ is employed in this study. The surface reactions include 42 irreversible elementary ones accounting for the steam reforming, the water-gas shift reforming and Boudouard reactions. This microscopic reaction model describes the adsorption and desorption reactions of 6 gas-phase species and surface reactions of 12 surface-adsorbed species.The predicted results show that the catalytic reactions take place at most regions of the porous anode, and a gradual CH4 distribution profile and incomplete CH4 conversion at the anode exit are observed. Transport processes of the fuel gas-phase species and temperature distribution are affected by both the internal reforming reactions and the electrochemical reaction. Parameter studies reveal that both low operating temperature and big permeability can increase the available nickel catalyst surface fraction in the anode. Such detailed reaction scheme is much more complicated to incorporate in SOFC modelling but helpful to predict surface-phase species profiles over Ni-catalyst surfaces.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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- CFD Simulation of Hydraulics of Sieve Trays with Gas Mal-Distribution
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- Optimization studies on Biosorption of Copper (II) by Crab Shell Using Response Surface Methodology(RSM)
- Simulation and Control of a Commercial Double Effect Evaporator: Tomato Juice
- Novel PCA-Based Technique for Identification of Dominant Variables for Partial Control
- Search for Optimal Design of Multiproduct Batch Plants under Uncertain Demand using Gaussian Process Modeling Solved by Heuristics Methods
- Adsorption of Crude Oil Using Meshed Groundnut Husk
- Revisiting Reaction-Diffusion Process in a Porous Catalyst: Improving the Adomian Solution
- Combining Design of Experiments Techniques, Connectionist Models, and Optimization for the Efficient Design of New Product Formulations
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- Utilization of MATLAB to Simulate Kinetics of Transesterification of Palm Oil-Based Methyl Esters with Trimethylolpropane for Biodegradable Synthetic Lubricant Synthesis
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- Kinetic Study and Modeling of Aerobic Biological Oxidation of Organic Wastewater
- Conceptual Screening of Reactive Extraction Processing Options
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- Empty Spray Sections of Vacuum Towers: Heat and Mass Transfer with a CFD approach
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Articles in the same Issue
- Article
- Influence of Temperature and Pressure on the Non-Catalytic Partial Oxidation of Natural Gas
- CFD Simulation of Hydraulics of Sieve Trays with Gas Mal-Distribution
- Experimental Measurement and Modeling of Diffusion Anomalies in a CMS Membrane
- Moisture Diffusivity and Energy Consumption during Microwave Drying of Plaster of Paris
- Optimization studies on Biosorption of Copper (II) by Crab Shell Using Response Surface Methodology(RSM)
- Simulation and Control of a Commercial Double Effect Evaporator: Tomato Juice
- Novel PCA-Based Technique for Identification of Dominant Variables for Partial Control
- Search for Optimal Design of Multiproduct Batch Plants under Uncertain Demand using Gaussian Process Modeling Solved by Heuristics Methods
- Adsorption of Crude Oil Using Meshed Groundnut Husk
- Revisiting Reaction-Diffusion Process in a Porous Catalyst: Improving the Adomian Solution
- Combining Design of Experiments Techniques, Connectionist Models, and Optimization for the Efficient Design of New Product Formulations
- Simulation and Analysis of Multi-scale Transport Phenomena and Catalytic Reactions in SOFC Anodes
- Utilization of MATLAB to Simulate Kinetics of Transesterification of Palm Oil-Based Methyl Esters with Trimethylolpropane for Biodegradable Synthetic Lubricant Synthesis
- A Fault Detection and Diagnosis Strategy for Batch/Semi-Batch Processes
- Kinetic Study and Modeling of Aerobic Biological Oxidation of Organic Wastewater
- Conceptual Screening of Reactive Extraction Processing Options
- Production of p-Anisic Acid by Modified Williamson Etherification Reaction Using Design of Experiments
- Empty Spray Sections of Vacuum Towers: Heat and Mass Transfer with a CFD approach
- Influence of Phase Compositions, pH and Temperature on Bovine Serum Albumin Partitioning in Aqueous Biphasic System
- Separation of Organic Chlorine Compounds through Batch Distillation Process
- Modeling of Infrared Drying of Polymer Solutions
- An Object-Oriented Graphics Interface Simulator for Analysis of Fischer-Tropsch Synthesis
- CFD Simulation of Wall Effects in Flow Past a Square Cylinder in a Stationary and Moving Plane Channel
- Axial Variation of Mass Transfer Volumetric Coefficients in Bubble Column Bioreactors
- Thermodynamics of Supercritical Fluid Extraction of Some Dyes and Pharmaceutical Compounds Using the Weighting Matrix Approach
- Study of Numerous Injections into Horizontal Flow Stream at Low Temperature
- Bayesian Network Method for Fault Diagnosis in a Continuous Tubular Reactor
- Isotherm and Kinetics Modeling of Fluoride Removal from Industrial Effluent by Alumina
- Effect of Temperature and Catalyst Concentrations on the Thermal Properties of Polyamide Adhesives at Low Operating Pressure
- Microfluidics of Nanodrug Delivery at Different Angles of Drug Injection
- Optimization of Process Variables for Amylase Production Using Agro Residual Wastes by Taguchi Methodology
- Sorption of Acid Blue 9 on to Wheat Bran: Optimization, Equilibrium and Kinetic Studies
- Review
- Safety Improvement and Operational Enhancement via Dynamic Process Simulator: A Review
- Review of Life Cycle Assessment in Agro-Chemical Processes
