Behavior and Distribution of Sulfur Species in Coal-direct Chemical Looping with Iron-based Oxygen Carriers PDF Download
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Author: Akash G. Basu
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 102
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Book Description
The rapidly rising population of the world requires us to come up with ways to meet growing energy demands efficiently while taking environmental precautions. Lately, much research has been conducted on various carbon capture utilization and storage (CCUS) methods as a way of providing energy while reducing emissions. An innovative method for carbon capture that has recently garnered attention is chemical looping combustion (CLC), due to its ability to produce a CO2 rich flue gas that can be easily sequestered and stored. The Ohio State University has developed the Coal-Direct Chemical Looping (CDCL) sub-pilot reactor system for coal combustion which uses an iron-based metal oxide as an oxygen carrier and a countercurrent moving bed for the reducer. In this study, sulfur species in the gas and solid phases in the CDCL process are studied in a bench scale moving bed reducer that is scaled down from the sub-pilot reducer to identify the distribution of sulfur species present in the solid and gaseous phases. The effects of operating parameters and the interaction between the oxygen carrier and sulfur species are also explored. It was discovered that increasing the reducer temperature produces more SO2 in the flue gas. It was also observed that the reduced oxygen carrier particles have an increased chance of reacting with H2S to form FeS. However, using CO2 as an enhancing gas can slow the rate of formation for FeS. Using CO2 provides the additional benefit of releasing more SO2 and causes less sulfur to transfer to the oxygen carrier. For the L-valve section, it was determined that using N2 as a carrier gas releases additional SO2 from the particles before transferring to the combustor, and even more SO2 can be released if the size of the L-valve section is increased. Finally, it was observed that increasing the ratio of the oxygen carrier to coal flow rate causes the conversion to increase, COS to form in zone 2 of the reducer, and less SO2 to be carried into the combustor, reducing emissions.
Author: Akash G. Basu
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 102
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Book Description
The rapidly rising population of the world requires us to come up with ways to meet growing energy demands efficiently while taking environmental precautions. Lately, much research has been conducted on various carbon capture utilization and storage (CCUS) methods as a way of providing energy while reducing emissions. An innovative method for carbon capture that has recently garnered attention is chemical looping combustion (CLC), due to its ability to produce a CO2 rich flue gas that can be easily sequestered and stored. The Ohio State University has developed the Coal-Direct Chemical Looping (CDCL) sub-pilot reactor system for coal combustion which uses an iron-based metal oxide as an oxygen carrier and a countercurrent moving bed for the reducer. In this study, sulfur species in the gas and solid phases in the CDCL process are studied in a bench scale moving bed reducer that is scaled down from the sub-pilot reducer to identify the distribution of sulfur species present in the solid and gaseous phases. The effects of operating parameters and the interaction between the oxygen carrier and sulfur species are also explored. It was discovered that increasing the reducer temperature produces more SO2 in the flue gas. It was also observed that the reduced oxygen carrier particles have an increased chance of reacting with H2S to form FeS. However, using CO2 as an enhancing gas can slow the rate of formation for FeS. Using CO2 provides the additional benefit of releasing more SO2 and causes less sulfur to transfer to the oxygen carrier. For the L-valve section, it was determined that using N2 as a carrier gas releases additional SO2 from the particles before transferring to the combustor, and even more SO2 can be released if the size of the L-valve section is increased. Finally, it was observed that increasing the ratio of the oxygen carrier to coal flow rate causes the conversion to increase, COS to form in zone 2 of the reducer, and less SO2 to be carried into the combustor, reducing emissions.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Chemical looping combustion (CLC) is a combustion technology that utilizes oxygen from oxygen carriers (OC), such as metal oxides, instead of air to combust fuels. The use of natural minerals as oxygen carriers has advantages, such as lower cost and availability. Eight materials, based on copper or iron oxides, were selected for screening tests of CLC processes using coal and methane as fuels. Thermogravimetric experiments and bench-scale fixed-bed reactor tests were conducted to investigate the oxygen transfer capacity, reaction kinetics, and stability during cyclic reduction/oxidation reaction. Most natural minerals showed lower combustion capacity than pure CuO/Fe2O3 due to low-concentrations of active oxide species in minerals. In coal CLC, chryscolla (Cu-based), magnetite, and limonite (Fe-based) demonstrated better reaction performances than other materials. The addition of steam improved the coal CLC performance when using natural ores because of the steam gasification of coal and the subsequent reaction of gaseous fuels with active oxide species in the natural ores. In methane CLC, chryscolla, hematite, and limonite demonstrated excellent reactivity and stability in 50-cycle thermogravimetric analysis tests. Fe2O3-based ores possess greater oxygen utilization but require an activation period before achieving full performance in methane CLC. Particle agglomeration issues associated with the application of natural ores in CLC processes were also studied by scanning electron microscopy (SEM).
Author: Paul Fennell
Publisher: Elsevier
ISBN: 0857097601
Category : Technology & Engineering
Languages : en
Pages : 467
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Book Description
Calcium and Chemical Looping Technology for Power Generation and Carbon Dioxide (CO2) Capture reviews the fundamental principles, systems, oxygen carriers, and carbon dioxide carriers relevant to chemical looping and combustion. Chapters review the market development, economics, and deployment of these systems, also providing detailed information on the variety of materials and processes that will help to shape the future of CO2 capture ready power plants. - Reviews the fundamental principles, systems, oxygen carriers, and carbon dioxide carriers relevant to calcium and chemical looping - Provides a lucid explanation of advanced concepts and developments in calcium and chemical looping, high pressure systems, and alternative CO2 carriers - Presents information on the market development, economics, and deployment of these systems
Author: Chuguang Zheng
Publisher: Academic Press
ISBN: 0128123222
Category : Science
Languages : en
Pages : 386
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Book Description
Oxy-fuel Combustion: Fundamentals, Theory and Practice provides a comprehensive review of various aspects of oxy-fuel combustion technology, including its concept, fundamental theory, pilot practice, large-scale feasibility studies and related practical issues, such as the commissioning and operation of an oxy-fuel combustion plant. Oxy-fuel combustion, as the most practical large-scale carbon capture power generation technology, has attracted significant attention in the past two decades. As significant progress has been achieved in worldwide demonstration and the oxy-combustion concept confirmed by Schwartze Pump, CUIDEN, Callide, Ponferrada and Yingcheng projects in the past five years, this book provides a timely addition for discussion and study. Covers oxy-fuel combustion technology Includes concepts, fundamentals, pilots and large-scale feasibility studies Considers related practical issues, such as the commissioning and operation of an oxy-fuel combustion plant Focuses on theories and methods closely related to engineering practice
Author: Zili Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Keith C. Hackley
Publisher:
ISBN:
Category : Coal
Languages : en
Pages : 44
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Book Description
Author: Liang-Shih Fan
Publisher: John Wiley & Sons
ISBN: 1118063139
Category : Technology & Engineering
Languages : en
Pages : 353
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Book Description
This book presents the current carbonaceous fuel conversion technologies based on chemical looping concepts in the context of traditional or conventional technologies. The key features of the chemical looping processes, their ability to generate a sequestration-ready CO2 stream, are thoroughly discussed. Chapter 2 is devoted entirely to the performance of particles in chemical looping technology and covers the subjects of solid particle design, synthesis, properties, and reactive characteristics. The looping processes can be applied for combustion and/or gasification of carbon-based material such as coal, natural gas, petroleum coke, and biomass directly or indirectly for steam, syngas, hydrogen, chemicals, electricity, and liquid fuels production. Details of the energy conversion efficiency and the economics of these looping processes for combustion and gasification applications in contrast to those of the conventional processes are given in Chapters 3, 4, and 5.Finally, Chapter 6 presents additional chemical looping applications that are potentially beneficial, including those for H2 storage and onboard H2 production, CO2 capture in combustion flue gas, power generation using fuel cell, steam-methane reforming, tar sand digestion, and chemicals and liquid fuel production. A CD is appended to this book that contains the chemical looping simulation files and the simulation results based on the ASPEN Plus software for such reactors as gasifier, reducer, oxidizer and combustor, and for such processes as conventional gasification processes, Syngas Chemical Looping Process, Calcium Looping Process, and Carbonation-Calcination Reaction (CCR) Process. Note: CD-ROM/DVD and other supplementary materials are not included as part of eBook file.
Author: Zhenyu Huang
Publisher: CRC Press
ISBN: 1466567678
Category : Technology & Engineering
Languages : en
Pages : 182
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Book Description
Wax Deposition: Experimental Characterizations, Theoretical Modeling, and Field Practices covers the entire spectrum of knowledge on wax deposition. The book delivers a detailed description of the thermodynamic and transport theories for wax deposition modeling as well as a comprehensive review of laboratory testing for the establishment of appropr
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Slide presentation only - No abstract supplied.
Author: Richard A. Anderson
Publisher:
ISBN:
Category : Carbonization
Languages : en
Pages : 198
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Book Description
