The structural characteristics, conductivity and stability have been examined. Theoretical and experimental study of solid oxide fuel. The report consists of 1 an overview of the fuel cells program including a brief discussion of how fuel cells work. The technology is, however, still immature and has not yet been implemented as dominant in any application or niche market. Improving the performance of solid oxide fuel cell systems. Solid oxide fuel cell under thermal cycling conditions 111 6. Sofcs are the most efficient devices for the electrochemical conversion of chemical energy of hydrocarbon fuels into electricity, and have been gaining increasing attention for clean and efficient. Improving the performance of solid oxide fuel cell systems matias halinen thesis for the degree of doctor of science in technology to be presented with due permission of the aalto university school of science for public examination and criticism in auditorium k216 at aalto university school of science espoo, finland, on the 8th of. Chapter 1 gives a short introduction to fuel cells including the electrochemical principles and the conventional and stateoftheart materials of solid oxide fuel cells sofc. Design and performance of a voc abatement system using a solid oxide fuel cell by dhananjai sudhakar borwankar a thesis presented to the university of waterloo. The solid oxide fuel cell is composed of all solid components with the electrolyte acting as an oxide ion conductor and operating at high temperature a. Nov 01, 2004 this report documents the status of the us department of energys fuel cells program as of the end of fy 87. With the increase in the rate of depletion of conventional energy sources, the increased volatility of fossil fuel prices and the environmental externalities of fossil fuels, particularly greenhouse gas ghg emissions the world has shifted its focus.
Modeling of solid oxide fuel cell performance with coal gasification. Dan hennessy delphi may 15, 20 doe hydrogen and fuel. The first commercial use of fuel cells came more than a century later in nasa space programs to generate power for satellites and space capsules. Bazant for his consistent trust and support during my thesis work. Dynamic simulation of an integrated solid oxide fuel cell.
A spectroscopic approach by michael brendan scott pomfret dissertation submitted to the faculty of the graduate school of the university of maryland, college park, in partial fulfillment of the requirements for the degree of doctor of philosophy 2007 advisory committee. Solid oxide fuel cell sofc is a promising alternative energy source, with its advantages of high operating efficiency, fuel flexibility, low emissions and relatively low cost. Modeling, control, and integration of a portable solid. Abstract solid oxide fuel cell sofc is an upcoming technology seen with great expectations for the production of electrical energy with good efficiency and minimal environmental impact.
We chose to work on the solid oxide fuel cell because it operates at a very high temperature above 800c which allow a fuel flexibility and a high electrical efficiency that both contributes to a better economy. Setup of a test bench and testing the single solid oxide. Synthesis of electrolyte and electrode materials for solid. In presenting this thesis in partial fulfillment of the requirements for a masters degree at. Fundamentals, design and applications provides a comprehensive discussion of solid oxide fuel cells sofcs. This phd thesis presents a modelling and simulation approach for coupling a solid oxide fuel cell sofc with a vapour absorption refrigeration system vars specifically for refrigerated trucks. In addition, the effectiveness of sofc in reducing greenhouse gases was assessed through a. A solid oxide fuel cell is a device that generates electricity directly from oxidizing a fuel it generates energy based on a chemical relation. In this thesis, a unified framework to model and analyze the dynamics of solid. Oxygen supplied at the cathode air electrode reacts with incoming electrons from the external circuit to form oxide ions, which migrate to the anode fuel electrode through the oxide ion conducting electrolyte. The introduction of new generation sofc, the so called metal supported solid oxide fuel cell mssofc has shown to.
Integration of micro solid oxide fuel cells in power generator. Publications included in this thesis mengran li, wei zhou, zhonghua zhu, recent development on perovskitetype cathode materials based on srcoo3. Modeling and structural optimization of solid oxide fuel cells. Fuel cells and solid state chemistry department risophd37en october 2007 this thesis is submitted in partial fulfilment of the requirements for the ph. Performance analysis of an intermediate temperature solid oxide fuel cell submitted by bora timurkutluk in partial fulfillment of the requirements for the degree of master of science in mechanical engineering, middle east technical university by, prof. Doctoral school in materials engineering xxiii cycle. Fuel cells and biogas abstract this thesis concerns biogasoperated fuel cells. Novel anode materials for solid oxide fuel cells university of. Since then, fuel cells have been used in many other. Fuel cell technology may contribute to more efficient energy use, reduce emissions and also perhaps revolutionize current energy systems. Solid oxide fuel cell thesis pdf for free essay writing worksheets seow 1998, however, considers process writing is there a relationship between enrollment in online elective courses and in departmental affairs, for the secondary solid oxide fuel cell thesis pdf school. Zero dimensional models were developed for the sofc and vars and detailed 1d and 3d models were developed for various components of the system. Solid oxide electrolysis cells performance and durability. A solid oxide fuel cell consists of a solid ceramic electrolyte surrounded by two ceramic electrodes.
A range of perovskite materials, previously shown to have potential for solid oxide fuel cell applications, were selected for further studies. Solid oxide fuel cell thesis pdf electrolyte supported solid oxide fuel cell by. In the detailed model, the three dimensional momentum, heat, and species transport equations are. The balance of plant bop and power electronics systems are treated as separate local units, and local controllers are designed for each unit using established linear techniques. Reversible solid oxide fuel cells sofcs have gained substantial interest in. Thesis submitted by dolors pla i asesio to apply for the. Drawing of a solid oxide cell solid oxide fuel cells sofc use a hard, ceramic compound of metal like calcium or zirconium oxides chemically, o 2 as electrolyte.
Parts of solid oxide fuel cell anode negative post of the fuel cell. Doctoral thesis pradnyesh satardekar 2014 published in trento italy by university of trento isbn. It also presents the motivation and objectives of the thesis. The high operating temperature of the sofc also provides excellent possibilities for cogeneration applications. Theoretical and experimental study of solid oxide fuel cell. Pdf modeling of solidoxide fuel cells researchgate.
In this thesis, several models of solid oxide fuel cell sofcs were developed in cell and system levels. Ubira etheses coupling of a solid oxide fuel cell with a. Pdf modeling and simulation of solid oxide fuel cell. Fuel is fed on the anode side and undergoes an oxidation reaction while releasing electrons to an external circuit. View solid oxide fuel cell research papers on academia. As a result, the electrochemical oxidation of h 2 fuel can be achieved with high performance. Materials development for the fabrication of metal. The second law efficiency calculations for the unit cell are carried out at 1273 k and 1073 k, 1 atm and 5 atm, and by assuming different conversion ratios for methane, hydrogen, and. Within these pages, an introduction to the concept of gas diffusion in solid oxide fuel cells is presented. The electrochemical reactions are efficient and occur through the supply of h 2 and o 2 usually air.
Simulation of solid oxide fuel cellbased power generation. A thesis submitted in partial fulfilment of the requirements of. In this phd thesis, new materials for solid oxide fuel cells have been researched. An innovative current collection architecture for microtubular solid oxide fuel cells sofc has been developed. Efficiency is about 60 percent, and operating temperatures are about 1,000 c about 1,800 f. Ganesh 100518745311 turbomachinery introduction the first fuel cells were invented in 1838. Fuel cells have advantages over other systems because of their high electrical efficiency and fuel flexibility. The operating principle of such a cell is illustrated in fig. However, there are several challenges concerning the sofc research. Local characterisation of solid oxide fuel cells e l i b. Materials development for the fabrication of metal supported. It converts the chemical energy of the fuel gas directly to electricity energy and therefore, very high electrical efficiencies can be achieved. Solid oxide fuel cell electrode characterization and.
The perovskite work for the cathode uses doping strategies. School of science and engineering capstone final report. Mat september 2007, 105 pages an intermediate temperature solid oxide fuel cell sofc is developed and its performance is investigated experimentally and theoretically. This book also discusses the history and underlying fundamental mechanisms of gas diffusion in solid oxide fuel cells, general theoretical mathematical models for gas diffusion, and traditional and advanced techniques for gas diffusivity. The most important factor influencing fuel cell performance is the. Experiments on material stability and novel test system development by nakkiran arulmozhi a thesis submitted to the department of chemical engineering in conformity with the requirements for the degree of master of applied science queens university kingston, ontario, canada february, 2012. Solid oxide fuel cell diesel auxiliary power unit demonstration dan hennessy delphi.
Solid oxide fuel cells sofcs, the topic of this thesis, are well suited. Ionic conducting composite as electrolyte for low temperature. In addition, the effectiveness of sofc in reducing greenhouse gases was assessed through a case study. Development and processing of solid oxide fuel cell materials. Temperature solid oxide fuel cell timurkutluk, bora m. This thesis deals with sofc which is at the forefront of the environmentally friendly technologies developing improved energy systems for this. Two additional primary fuel cell types direct methanol dmfc and alkaline afc are used primarily in transportation and non stationary fuel cell applications, in addition to pemfc. Modeling of solid oxide fuel cell performance with coal. The long term stability of conventional anode supported solid oxide fuel cell assofc with ni based anode is tested by its limited tolerance towards redox cycling and rapid thermal cycling. A thesis accepted by the faculty of energy technology, process engineering and biological.
Design and performance of a voc abatement system using a. A nickel wire is coiled around a thin carbon composite rod in order to fabricate cell supports. These modelswere used in several case studiesto simulate the performance of the cells and systems studied. Fuel cells offer high electrical efficiencies and the solid oxide fuel cell is particularly interesting. A solid oxide cell soc reactor can operate as both fuel cell and electrolysis cell. Seventh edition fuel cell handbook technical report. Different carbon composites such as pencil leads and carbon fibres were investigated. This sofc model was integrated with simulation modules for other system components e. A solid oxide electrolyser cell soec is a solid oxide fuel cell set in regenerative mode for the electrolysis of water with a solid oxide, or ceramic, electrolyte to produce oxygen and hydrogen gas. Setup of a test bench and testing the single solid oxide fuel cell at various temperatures marek skrzypkiewicz a 30 credit units master. However, many fundamental questions about this system still need to be addressed by modeling the complex coupling between sofcs and gasification.
Highefficiency stationary power systems that integrate coal gasification with solid oxide fuel cells sofcs have been championed by the department of energy for the past couple of decades. Little is known about the complex interfacial electrochemistry and, and it is also thermochemistry. In this paper a complete dynamic model of a solid oxide fuel cell sofc based residential cogenerative chp energy system has been developed, with particular attention to the heat exchangers. Soecs can also be used to do electrolysis of co 2 to produce co and oxygen or even coelectrolysis of water and co 2 to produce syngas and oxygen. Following this general analysis, two simple solid oxide fuel cell systems are examined. Advantages and disadvantages of solid oxide fuel cells. Computational fluid dynamics modelling of solid oxide fuel. This thesis focuses mainly on the synthesis and characterisation of materials for use as an anode in sofcs. The work presented within this thesis focuses on the synthesis, characterisation and processing of novel materials for use within solid oxide fuel cells.
Development and processing of solid oxide fuel cell materials core. Processing and characterization of proton conducting yttrium. Seventh edition fuel cell handbook technical report osti. Solid oxide fuel cells sofc were fabricated and the electrodes tested for their individual catalytic effectiveness in various fuels by exposing each electrode to mixed gas while the opposite electrode was exposed to its respective pure gas. Fuel cell, molten carbonate fuel cell and solid oxide fuel cell. Performance analysis of an intermediate temperature solid oxide fuel cell submitted by bora timurkutluk in partial fulfillment of the requirements for the degree of master of science in mechanical engineering, middle east technical university by. Solid oxide fuel cell market size share, global industry. Dec 22, 2011 a novel method for the control and integration of a portable hybrid solid oxide fuel cell sofc system, based on hydrocarbon fuel, is presented in this paper. Pdf modeling of solid oxide fuel cell performance with. To address the wide range of reported conductivities in literature and investigate the viability of yttriumdoped barium zirconate bazr 1x y x o 3 as a membrane in electrochemical devices, the factors governing the protonic transport properties have been explored, with the aim of attaining reproducible proton conductivity in welldensified samples. Setup of a test bench and testing the single solid oxide fuel. Processing and characterization of proton conducting. A twodimensional dynamic model was created for a siemens westinghouse type tubular solid oxide fuel cell sofc.
1059 1489 1472 535 38 1057 725 1148 1124 1057 658 1502 515 968 741 274 494 1015 643 1156 70 49 1094 233 252 877 256 578 1149 906 244 894 456 968 326 305 497 346 1009 609 690 449 777 72