THESIS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Chemical-Looping Combustion and Chemical-Looping with Oxygen Uncoupling - Use of Combined Manganese and Iron Oxides for Oxygen Transfer Golnar Azimi Division of Environmental Inorganic Chemistry Department of Chemical and Biological Engineering The overarching aim of this thesis is to assess the effect of H2S on chemical looping combustion using iron (III) oxide in a laboratory scale spouted bed reactor. A closed-system spouted bed reactor has been designed and constructed to study the solid looping system with gaseous fuel Jul 13, · Abstract. Carbon Capture and Storage (CCS) is one option to meet the increasing energy demand as well as reduce net CO2 emissions to the atmosphere. Chemical Looping Combustion (CLC) is a promising CCS technology proposed to meet the challenge of mitigating the carbon dioxide (CO2) emissions. CLC process can be based on interconnected fluidized beds, consisting of air reactor, fuel Author: Ngozi Chinwe Ekpe
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Computational Fluid Dynamics Modeling and Simulations of Fluidized Bed Reactors for Chemical Looping Combustion. Subhodeep BanerjeeWashington University in St, chemical looping combustion phd thesis. Louis Follow. Chemical looping combustion CLC is a next generation combustion technology that shows great chemical looping combustion phd thesis as a solution for the need of high-efficiency low-cost carbon capture from fossil fueled power plants.
To realize this chemical looping combustion phd thesis on an industrial scale, the development of high-fidelity simulations is a necessary step to develop a thorough understanding of the CLC process. Although there have been a number of experimental studies on CLC in recent years, CFD simulations have been limited in the literature, chemical looping combustion phd thesis.
In this dissertation, reacting flow simulations of a CLC reactor are developed using the Eulerian approach based on a laboratory-scale experiment of a dual fluidized bed CLC system.
The salient features of the fluidization behavior in the air reactor and fuel reactor beds representing a riser and a bubbling bed respectively are accurately captured in the chemical looping combustion phd thesis. This work is one of the first 3-D simulations of a complete circulating dual fluidized bed system; it highlights the importance of conducting 3-D simulations of CLC systems and the need for more accurate empirical reaction rate data for future CLC simulations.
Simulations of the multiphase flow with chemical reactions in a spouted bed fuel reactor for coal-direct CLC are performed based on the Lagrangian particle tracking approach. The Discrete Element Method DEM provides the means for tracking the motion of individual metal oxide particles in the CLC system as they react with the fuel and is coupled with CFD for capturing the solid-gas multiphase hydrodynamics. The overall results of the coupled CFD-DEM simulations using Fe-based oxygen carriers reacting with gaseous CH4 demonstrate that chemical reactions have been successfully incorporated into the CFD-DEM approach.
The simulations show a strong dependence of the fluidization performance of the fuel reactor on the density of bed material and provide important insight into selecting the right oxygen carrier for the enhanced performance. Given the high computing cost of CFD-DEM, it is necessary to develop a chemical looping combustion phd thesis methodology based on the principles of dynamic similarity that can be applied to expand the scope of this approach to larger CLC systems up to the industrial scale.
A new scaling methodology based on the terminal velocity is proposed for spouted fluidized beds. Simulations of a laboratory-scale spouted fluidized bed are used to characterize the performance of the new scaling law in comparison with existing scaling laws in the literature.
It is shown that the new model improves the accuracy of the simulation results compared to the other scaling methodologies while also providing the largest reduction in the number of particles and in turn in the computing cost. CFD-DEM simulations are conducted of the binary particle bed associated with a coal-direct CLC system consisting of coal represented by plastic beads and oxygen carrier particles and validated against an experimental riser-based carbon stripper.
The simulation results of the particle behavior and the separation ratio of the particles are in excellent agreement with the experiment. A credible simulation of a binary particle bed is of particular importance for understanding the details of the fluidization behavior; the baseline simulation established in this work can be used as a tool for designing and optimizing the performance of such systems.
The simulations conducted in this dissertation provide a chemical looping combustion phd thesis foundation for future simulations of CD-CLC systems using solid coal as fuel, considering the additional complexities associated with the changing density and diameter of the coal particles as devolatilization and gasification process occur. A complete reacting flow simulation in the CFD-DEM framework will be crucial for the successful deployment of CD-CLC technology from the laboratory scale to pilot and industrial scale projects.
Chemical Engineering CommonsMechanical Engineering Commons. Advanced Search. Home About FAQ My Account Accessibility Statement. Privacy Copyright. Skip to main content Washington University Open Scholarship. Home About FAQ My Account, chemical looping combustion phd thesis. Title Computational Fluid Dynamics Modeling and Simulations of Fluidized Bed Reactors for Chemical Looping Combustion.
Author Subhodeep BanerjeeWashington University in St. Abstract Chemical looping combustion CLC is a next generation combustion technology that shows great promise as a solution for the need of high-efficiency low-cost carbon capture from fossil fueled power plants. Committee Members Richard L. Axelbaum, Kenneth L.
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Jul 13, · Abstract. Carbon Capture and Storage (CCS) is one option to meet the increasing energy demand as well as reduce net CO2 emissions to the atmosphere. Chemical Looping Combustion (CLC) is a promising CCS technology proposed to meet the challenge of mitigating the carbon dioxide (CO2) emissions. CLC process can be based on interconnected fluidized beds, consisting of air reactor, fuel Author: Ngozi Chinwe Ekpe Chemical Looping Combustion Phd Thesis, why i love football essay, intro to citizenshio essay, perfect compare and contrast essay examples. Learn about the full price. We have loyal prices and transparent payment system. You will be pleased to learn about special offers/10() THESIS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Chemical-Looping Combustion and Chemical-Looping with Oxygen Uncoupling - Use of Combined Manganese and Iron Oxides for Oxygen Transfer Golnar Azimi Division of Environmental Inorganic Chemistry Department of Chemical and Biological Engineering
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