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Modeling Of Coal Gasification For Fuel Cell Utilization
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Book Synopsis Modeling of Coal Gasification for Fuel Cell Utilization by : M. L. Finson
Download or read book Modeling of Coal Gasification for Fuel Cell Utilization written by M. L. Finson and published by . This book was released on 1978 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes recent progress on a DOE-supported program to construct computer models for potential future combined coal gasification/fuel cell power generation systems. The approach is to develop physically well-founded descriptions for the performance of both molten carbonate fuel cells and coal gasifiers, and to utilize the models to prepare performance maps for each device, enabling selection of the optimum interfaces between fuel cells and gasifiers. In a previous phase of the study, we identified entrained flow gasification as the most appropriate type for providing fuel cell feed gas, on the basis of off-gas composition and the ability to handle a wide range of coal types. Accordingly, a substantial portion of the current effort is concerned with the development of a computer model for entrained flow gasifiers. Furthermore, several scaling laws have been developed for fuel cell performance. Mostly based on equilibrium (open-circuit) considerations to date, these address such issues as the requirements for avoiding carbon deposition, the potential effects of methane conversion, and the distribution of heat sources and sinks within the cell.
Book Synopsis Modeling of Coal Gasification for Fuel Cell Utilization by :
Download or read book Modeling of Coal Gasification for Fuel Cell Utilization written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Coal Gasification for Fuel Cell Utilization by : P. F. Lewis
Download or read book Modeling of Coal Gasification for Fuel Cell Utilization written by P. F. Lewis and published by . This book was released on 1977 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Department of Energy. Division of Fossil Fuel Utilization Publisher : ISBN 13 : Total Pages :164 pages Book Rating :4.3/5 (129 download)
Book Synopsis Modeling of coal gasification for fuel cell utilization by : United States. Department of Energy. Division of Fossil Fuel Utilization
Download or read book Modeling of coal gasification for fuel cell utilization written by United States. Department of Energy. Division of Fossil Fuel Utilization and published by . This book was released on 1978 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coal Processing for Fuel Cell Utilization by :
Download or read book Coal Processing for Fuel Cell Utilization written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Detailed Fuel Cell Modeling for Coal-based Integrated Gasification Fuel Cell System Design and Analysis by : Mu LI
Download or read book Detailed Fuel Cell Modeling for Coal-based Integrated Gasification Fuel Cell System Design and Analysis written by Mu LI and published by . This book was released on 2010 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated gasification fuel cell (IGFC) systems that combine coal gasification and solid oxide fuel cells (SOFC) are promising for highly efficient and environmentally friendly utilization of coal for power production. In this work, a dimensional finite volume model for planar SOFC has been developed for IGFC system design and analysis. The model can simulate SOFC overall performance and detailed internal profiles of species mole fractions, temperature, current density, and electrochemical losses. The model is capable of supporting recent SOFC improvements, including anode-supported design, the use of metallic interconnects, and reduced polarization losses. Sensitivity analysis is conducted to identify activation polarization parameters appropriate for modern SOFC modeling. The model is verified using literature available data and compared with state-of-the-art SOFC experimental data. Model results are shown for SOFC operation on humidified H2 and CH4-containing syngas, under co-, counter- or cross-flow configurations. The effects of fuel compositions and flow configurations on SOFC performance and thermal profiles are evaluated, and the implications of these results for system design and analysis are discussed. Innovative IGFC designs are analyzed in Aspen Plus first by employing a non-dimensional SOFC model. The sensitivity of IGFC thermal performance on the extent of carbon capture is also investigated. The most promising system identified consists of catalytic hydro-gasification, low-temperature gas cleaning, a hybrid fuel cell-gas turbine power block, and uniquely features recycling of the de-carbonized, humidified anode exhaust back to the hydro-gasifier. This system serves as a "baseline" case in the following work. The developed dimensional SOFC model is linked with Aspen Plus and employed for IGFC system analysis. The results further confirm the necessity of employing a dimensional SOFC model in IGFC design. To maintain the SOFC internal temperature within a safe operating range, the required cooling air flow rate is much larger than predicted by the non-dimensional SOFC model, which results in a large air compressor load and severely reduces the system efficiency. Options to mitigate the problem and improve IGFC performance are investigated and a design with staged SOFC stacks and cascading air flow can achieve a system efficiency of close to that of the baseline case.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coal Processing for Fuel Cell Utilization by :
Download or read book Coal Processing for Fuel Cell Utilization written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coal Processing for Fuel Cell Utilization by : P. F. Lewis
Download or read book Coal Processing for Fuel Cell Utilization written by P. F. Lewis and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mathematical Modeling for Underground Coal Gasification by : Preeti Aghalayam
Download or read book Mathematical Modeling for Underground Coal Gasification written by Preeti Aghalayam and published by Momentum Press. This book was released on 2017-10-26 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underground coal gasification (UCG) is an important technique for future coal utilization. It has the potential to be a clean technology and to tap un-mineable, deep coal deposits across the world. Commercialization of UCG has been riddled with a variety of issues, including public perception and a lack of clear comprehension about underlying physicochemical phenomena. This book will bridge the gap in knowledge and highlight the modern findings related to the complex interactions in UCG. With a focus on the chemical reactions in UCG and treating the underground coal cavity as “nature’s own chemical reactor”, various mathematical modeling studies that serve to unravel some of the mysteries of this decades-old technique will be revealed.
Book Synopsis Coal Processing for Fuel Cell Utilization by : Paul Lewis
Download or read book Coal Processing for Fuel Cell Utilization written by Paul Lewis and published by . This book was released on 1979 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coal and Biomass Gasification by : Santanu De
Download or read book Coal and Biomass Gasification written by Santanu De and published by Springer. This book was released on 2017-12-13 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the science and technology of the gasification process and the production of electricity, synthetic fuels and other useful chemicals. Pursuing a holistic approach, it covers the fundamentals of gasification and its various applications. In addition to discussing recent advances and outlining future directions, it covers advanced topics such as underground coal gasification and chemical looping combustion, and describes the state-of-the-art experimental techniques, modeling and numerical simulations, environmentally friendly approaches, and technological challenges involved. Written in an easy-to-understand format with a comprehensive glossary and bibliography, the book offers an ideal reference guide to coal and biomass gasification for beginners, engineers and researchers involved in designing or operating gasification plants.
Book Synopsis Modeling of Solid Oxide Fuel Cell Performance with Coal Gasification by : Katherine Mary Ong
Download or read book Modeling of Solid Oxide Fuel Cell Performance with Coal Gasification written by Katherine Mary Ong and published by . This book was released on 2016 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growing concern over greenhouse gas emissions has driven research into clean coal power production alternatives. Novel coal power plant designs that lower CO2 emissions are imperative in the coming decades to mitigate global temperature rise. High-efficiency 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. However, many fundamental questions about this system still need to be addressed by modeling the complex coupling between SOFC's and gasification. More specifically, work is needed to characterize SOFC performance with a range of syngas (H2+CO) mixtures produced by coal gasification. This thesis used a multiscale modeling approach to analyze SOFC performance with coal syngas at both the systems level and at the surface reaction scale. The first investigation in this thesis couples an equilibrium gasifier model to a detailed ID SOFC model to study the theoretical performance of the coupled system run on steam or carbon dioxide. The results of this study indicate that the system performs substantially better with steam gasification than with CO2 gasification as a result of the faster electro-oxidation kinetics of H2 relative to CO. The coupled system is then shown to reach higher current densities and efficiencies when the heat released by the fuel cell is sent to the gasifier instead of a bottoming cycle. 55-60% efficiency is then predicted for the system with heat transfer and steam gasification, making this technology competitive with other advanced system designs and almost twice as efficient as conventional coal-fired power plants. The second study in this thesis investigates SOFC behavior with H2 and CO (syngas) mixtures that come from coal gasification. SOFC models typically neglect CO electrochemistry in the presence of H2 and H20, assuming that the water-gas-shift reaction proceeds faster than CO electrooxidation. The results of this study show, however, that CO electro-oxidation cannot be neglected in syngas mixtures, particularly at high current densities for high CO-content syigas. First the simulations demonstrate that incoming CO is not all shifted to form H2 by reforming reactions before reaching the electrochemical reaction sites. Furthermore, the results of this 'study confirm that direct electro-oxidation of CO contributes non-negligible current relative to H2 at high anode overpotentials. Together these results show that CO electro-oxidation plays an important role in SOFC performance not only via water-gas-shift reforming, but also via direct electro-oxidation when H2 is also present. This work suggests that accurate models for both surface reforming and direct electro-oxidation of CO in SOFC anodes must be included in order to capture performance when using coal syngas mixtures. Finally, a multi-step mechanism for the simultaneous electro-oxidation of H2 and CO in SOFCs is implemented and studied. This mechanism combines a couple of reaction pathways: hydrogen (H) spillover to the electrolyte, and oxygen (O) spillover to hydrogen and CO on the anode. This mechanism is successfully verified in the model against a wide range of experimental data for mixtures of CO/CO2, H2/N2, H2/H20, H2/CO, and H2/CO2 . The simulations show that H spillover is the dominant source of current at low anode activation overpotentials, but also demonstrate that the currents produced by 0 spillover are non-negligible at high overpotentials. Furthermore, it is shown that the current produced by 0 spillover to CO is not limited by the rate of CO adsorption on nickel, which leads CO to contribute more to cell performance at high currents. Together these three modeling studies demonstrate how coal can be efficiently converted to electricity via gasification and the simultaneous electro-oxidation of H2 and CO in a solid oxide fuel cell.
Book Synopsis Coal Combustion and Gasification by : L.Douglas Smoot
Download or read book Coal Combustion and Gasification written by L.Douglas Smoot and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of coal is required to help satisfy the world's energy needs. Yet coal is a difficult fossil fuel to consume efficiently and cleanly. We believe that its clean and efficient use can be increased through improved technology based on a thorough understanding of fundamental physical and chemical processes that occur during consumption. The principal objective of this book is to provide a current summary of this technology. The past technology for describing and analyzing coal furnaces and combus tors has relied largely on empirical inputs for the complex flow and chemical reactions that occur while more formally treating the heat-transfer effects. GrOWing concern over control of combustion-generated air pollutants revealed a lack of understanding of the relevant fundamental physical and chemical mechanisms. Recent technical advances in computer speed and storage capacity, and in numerical prediction of recirculating turbulent flows, two-phase flows, and flows with chemical reaction have opened new opportunities for describing and modeling such complex combustion systems in greater detail. We believe that most of the requisite component models to permit a more fundamental description of coal combustion processes are available. At the same time there is worldwide interest in the use of coal, and progress in modeling of coal reaction processes has been steady.
Book Synopsis Computational Modeling of Underground Coal Gasification by : Vivek V. Ranade
Download or read book Computational Modeling of Underground Coal Gasification written by Vivek V. Ranade and published by CRC Press. This book was released on 2019-07-15 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with development of comprehensive computational models for simulating underground coal gasification (UCG). It starts with an introduction to the UCG process and process modelling inputs in the form of reaction kinetics, flow patterns, spalling rate, and transport coefficient that are elaborated with methods to generate the same are described with illustrations. All the known process models are reviewed, and relative merits and limitations of the modeling approaches are highlighted and compared. The book describes all the necessary steps required to determine the techno-economic feasibility of UCG process for a given coal reserve, through modeling and simulation.
Book Synopsis Computer modeling of coal gasification reactors by : Systems, Science, and Software (Firm)
Download or read book Computer modeling of coal gasification reactors written by Systems, Science, and Software (Firm) and published by . This book was released on 1977 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Entrained-bed Coal Gasification Modelling by : Chin-Yung Wen
Download or read book Entrained-bed Coal Gasification Modelling written by Chin-Yung Wen and published by . This book was released on 1978 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
