This device produces electric current through the electrochemical oxidation of fuel through an ionic conductor. This work is downloaded from delft university of technology. Fuel cells and biogas abstract this thesis concerns biogasoperated fuel cells. Ganesh 100518745311 turbomachinery introduction the first fuel cells were invented in 1838. Depending on the application, the tubular sofcs have dimensions from needlelike shapes to lengths of about 1. It has zero emissions, which makes it an ecofriendly technology. Among several types of fuel cells, the solid oxide fuel cell sofc has the highest efficiency and could utilize various fuels 1. They operate on cathodes that become selective only under short residence times. The hybrid solid oxide fuel cell system combines the fuel cell with a microturbine to obtain up to 70% cycle efficiency, and then distributes the electrical power to the loads via a power distribution system. An advanced fuel cell simulator a thesis submitted to the. Little is known about the complex interfacial electrochemistry and, and it is also thermochemistry. Modeling and control of the power conversion unit in a solid oxide fuel cell environment. A solid oxide fuel cell sofc is a solid state energy conversion system that converts chemical energy into electrical energy and heat at elevated temperatures. Advantages and disadvantages of solid oxide fuel cells.
Development of porous metalsupported solid oxide fuel cells. Both types can consist of one or several single cells per stacking unit, i. Pdf the main concerns in the world today, especially in the energy field. The input parameters of the anodesupported sofc model developed in this study are as follows. The people at topsoe fuel cell as for their interest in my thesis. Solid oxide fuel cell market verified market research. Lastly, and most importantly, i must thank my love, suzanne. Pdf a solid oxide fuel cell sofc is a solidstate energy conversion system that converts chemical energy. An advanced fuel cell simulator a thesis submitted. Solid oxide fuel cell components download ebook pdf. Synthesis and characterisation of materials for solid. 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.
Computational modelling of ceriabased solid oxide fuel cells electrolyte materials. Three categories of modelling based on the white, the black and the greybox approaches are introduced. Fuel cells produce negligible or undetectable amounts of nitrous oxides and should also produce less noise pollution than conventional generators 5,6. Anodesupported solid oxide fuel cells sofcs model based on artificial neural network ann and optimized design variables were modeled. The simulator provides an inexpensive and accurate representation of a solid oxide fuel cell under steady state and transient conditions and can replace an actual fuel cell during testing of power conditioning equipment. The solid oxide fuel cell is made up of a solid ceramic electrolyte which separates two electrodes as shown in figure 1a. Solid oxide fuel cells sofc are environmen tally friendly energy conversion systems to. Dynamic simulation of an integrated solid oxide fuel cell. A thin film electrode solid oxide fuel cell model topic. Solid oxide fuel cells an overview sciencedirect topics. Solid oxide fuel cell sofc is the most efficient type of the fuel cell.
On having consulted this thesis youre accepting the following use conditions. Microalloying mediated segregation and interfacial oxidation of fecr alloys for solid oxide fuel cell applications thesis for the degree of doctor of science in technology to be presented with due permission for public examination and criticism in konetalo building, auditorium k1702. The first system consists of a solid oxide unit cell with external reformer. Author links open overlay panel j will a mitterdorfer c kleinlogel d perednis l. Click download or read online button to get solid oxide fuel cell components book now.
Characterization of the electrochemical performance of. As a result these cells are not functioning as true mixed reactant solid oxide fuel cells mrsofc. Single chamber solid oxide fuel cells, scsofcs, design and performance is discussed. It is shown that all of them operate on nonselective anodes.
Most of the present fuel cell systems use hydrogen as fuel, which is the product of natural gas. Novel coal power plant designs that lower co2 emissions are imperative in the coming decades to mitigate global temperature rise. Modeling and structural optimization of solid oxide fuel cells. Integration of micro solid oxide fuel cells in power generator. Advances in solid oxide fuel cell technology sciencedirect. The global solid oxide fuel cell market was valued at usd 295. 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. 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. School of science and engineering capstone final report. Novel anode materials for solid oxide fuel cells university of. A twodimensional dynamic model was created for a siemens westinghouse type tubular solid oxide fuel cell sofc. Quiet, vibration free operation of solid oxide fuel cells also eliminates noise usually associated with conventional power generation systems.
Solid oxide fuel cells sofcs are characterized by low pollution, and are therefore the best alternative both for distributed energy sources and large. Lsf electrode displays excellent performance in both fuel cell and electrolysis operations, while it also offers good durability tracked over h of fuel cell operation. Diagnosis methodology and technique for solid oxide fuel. Progress in material selection for solid oxide fuel cell.
A solid oxide fuel cell sofc is an electrochemical conversion device that produces electricity directly from oxidizing a fuel. Solid oxide fuel cells sofcs can be grouped into tubular and planar designs. Microstructure, residual stress, and mechanical properties. Promotion of oxygen reduction and evolution by applying a nanoengineered hybrid catalyst on cobalt free electrodes for solid oxide cells. Report on the status of the solid oxide fuel cell program. Synthesis and characterisation of materials for solid oxide fuel cell cathodes article pdf available in international journal of materials and product technology 271.
This book presents methodologies suitable for the optimal design of control and diagnosis strategies for solid oxide fuel cell sofc systems. Bazant for his consistent trust and support during my thesis work. However, there are several challenges concerning the sofc research. The objective of this study was to develop a process of cofiring the ceramic layers of a solid oxide fuel cell attached to their porous metal support.
Paircoil2 predicts the parallel coiled coil fold from sequence using pairwise residue probabilitis with the paircoil algorithm and an updated coiled coil database. Influence of stack arrangement on performance of multiplestack solid oxide fuel cells with nonuniform potential operation. Influence of stack arrangement on performance of multiple. In this doctoral thesis, a power conversion unit for a 10 kwsolid oxide fuel cell is modeled, and a suitable control system is designed. The reduction of oxygen at the cathode is the slow step in the cell reaction at low temperatures, meaning that improvements in cathode performance translates directly to higher cell power densities and lower costs per kilowatt. Other components such as interconnects and sealings are also of great importance for the operation of an sofc but are out of the scope of this thesis. Microalloying mediated segregation and interfacial. Polymer electrolyte fuel cell, alkaline fuel cell, alkaline fuel cell, molten carbonate fuel cell and solid oxide fuel cell. This is a major departure from the traditional fuel cell architecture where the support layer is a ceramic composite made of ysz and nio. These fuel cells provide many advantages over traditional energy conversion systems including high efficiency, reliability, modularity, fuel adaptability, and very low levels of no x and so x emissions. The solid oxide fuel cell is an electrochemical device for the conversion of hydrogen or a hydrocarbon fuel directly into electrical power. The implications of this work on the design and fabrication of structurally viable microfabricated solid oxide fuel cell. Hightemperature solid oxide fuel cells based on yttriastabilized. In this doctoral thesis, a power conversion unit for a 10 kwsolid.
Materials and manufacturing technologies for solid oxide. One key feature of the methodologies presented is the use of modeling tools with an ideal balance between accuracy and computational burden. An advanced fuel cell simulator a thesis by prabha ramchandra acharya submitted to the o. Following this general analysis, two simple solid oxide fuel cell systems are examined. Unlimited viewing of the articlechapter pdf and any associated supplements and figures. Models for solid oxide fuel cell systems exploitation of. The anode is the part of the sofc that has main focus in this thesis.
A solid oxide fuel cell is a device that produces electricity directly from oxidizing hydrogen. Preliminary residual stress characterization of cosputtered ptysz anode and cathode materials and fuel cell trilayers of ptyszyszptysz is also presented. Promotion of oxygen reduction and evolution by applying a. Abstract solid oxide fuel cells sofcs are becoming one of the main competitors among environmental friendly energy sources due to low emission rates, high electrical generating efficiency and potential for low operating cost. Integrated gasification fuel cell igfc systems combining coal gasification and solid oxide fuel cells sofc are promising for highly efficient and environmentally friendly utilization of coal for power production. Menzlera, peter holtappelsb, takaya fujisakic, leonard kwat. Fabrication of thin electrolytes for secondgeneration. Fuel cell technology may contribute to more efficient energy use, reduce emissions and also perhaps revolutionize current energy systems. Solidoxide fuel cells sofcs are the most widely used fuel cells because they exhibit flexibility, power generation efficiency, and low pollution formation. The goal of this thesis is to investigate the design of one such device, a twochamber microfabricated solid oxide fuel cell sofc.
For optimum cell performance, the ysz electrolyte must be free of porosity to avoid. As said in the previous section high temperature solid oxide fuel cells sofcs. Solid oxide fuel cells sofc are devices that are used to efficiently convert chemical energy into electrical energy. Solid oxide fuel cells sofc is one of the most promising fuel cell systems for generating electricity in an efficient and enviroment friendly way 1. On the single chamber solid oxide fuel cells sciencedirect. Users may download and print one copy of any publication from the public. Solid oxide fuel cells sofc have emerged as energy conversion devices in achieving high efficiency of over 70% with regeneration. Verkerk and burggraaf 1 investigated the oxygen transfer on esb with. The cathode is one of the most important components for development in solid oxide fuel cells sofcs.
This work presents systematic to develop and validate the microscopic scale models of a single cell sofc supplied with humidified. The technology is, however, still immature and has not yet been implemented as dominant in any application or niche market. Images of carbon blackfree nioysz sintered at 1400 c. 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. A theoretical solid oxide fuel cell model for system. This sofc model was integrated with simulation modules for other system components e. Modeling of solid oxide fuel cell performance with coal. Thus, there is a strong market for successful portable fuel powered electric generators. Users may download and print one copy of any publication from the public portal for the. Theoretical and experimental study of solid oxide fuel. Pdf achievements and trends of solid oxide fuel cells in clean. Solid oxide fuel cell sofc integrated power plants tu delft.
Solid oxide fuel and electrolysis cells 9 christian lensera, david udomsilpa, norbert h. An electronic version of this dissertation is available at. The solid oxide fuel cell sofc is produced from oxide materials, which become active for transportation of oxide ions and electro. Report on the status of the solid oxide fuel cell program page 2 usable power. Solid oxide fuel and electrolysis cells pdf free download. Fabrication of thin electrolytes for secondgeneration solid oxide fuel cells. Connecting the external path back to the cathode completes the circuit. This site is like a library, use search box in the widget to get ebook that you want. 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. The design choices are based on reported thermodynamic simulation results for the entire. They are clean, modular, and efficient and retain this. A finite volume sofc model for coalbased integrated.