Hydrodynamics Of Gas Solids Fluidization
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Hydrodynamics Of Gas Solids Fluidization
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Author : Nicholas P. Cheremisinoff
language : en
Publisher: Butterworth-Heinemann
Release Date : 1984
Hydrodynamics Of Gas Solids Fluidization written by Nicholas P. Cheremisinoff and has been published by Butterworth-Heinemann this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Science categories.
Hydrodynamics Of Gas Solids Fluidization
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Author : Nicholas P. Cheremisinoff
language : en
Publisher:
Release Date : 1984-01-01
Hydrodynamics Of Gas Solids Fluidization written by Nicholas P. Cheremisinoff and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984-01-01 with categories.
Hydrodynamics And Flow Structure Gas And Solids Mixing Behavior And Choking Phenomena In Gas Solid Fluidization
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Author : Bing Du
language : en
Publisher:
Release Date : 2005
Hydrodynamics And Flow Structure Gas And Solids Mixing Behavior And Choking Phenomena In Gas Solid Fluidization written by Bing Du and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Fluidization categories.
Abstract: In this study, the dynamic flow behavior and gas and solids mixing behavior in the turbulent fluidized beds are investigated by using Electrical Capacitance Tomography (ECT) technique and tracer technique. The ECT study reveals that the time-averaged solids holdup distribution exhibits radial symmetry in the turbulent regime. The addition of 10% fine particles decreases the solids concentration in the emulsion phase. The flow behavior in the turbulent fluidized beds is not appreciably affected by the temperature up to 400 oC. More than one spiral motion of bubble swarms is observed in the bubbling regime for the 0.3 m ID fluidized bed. The gas and solids mixing behavior varies significantly with the flow regimes. A small quantity of fine particles is noted to drastically affect the gas and solids mixing behavior in the turbulent fluidized bed. For Group A particles, the flow in the bed transits from the dilute regime to the turbulent regime when the gas velocity is below Utr or the solids circulation rate is lower than Gs, tr. Such flow transition can be signified as the choking transition. For Group B particles, choking is initiated by the formation of the square-nosed slugs (0.05 m ID column) or the wall slugs (0.1 m ID CFB) when the gas velocity is below Utr or the solids circulation rate is lower than Gs, tr. When the gas velocity is above Utr or the solids circulation rate is higher than Gs, tr, choking is characterized by the formation of open slugs. These regime transitions are characterized as the choking transition. A model based on the movement of the solids blob at the center of the bed is developed to predict the critical lifetime of a solids blob in a circulating fluidized bed. The criterion for the occurrence of choking transition in a circulating fluidized bed for both Group A and Group B particles is given.
Essentials Of Fluidization Technology
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Author : John R. Grace
language : en
Publisher: John Wiley & Sons
Release Date : 2020-06-15
Essentials Of Fluidization Technology written by John R. Grace and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-06-15 with Technology & Engineering categories.
A concise and clear treatment of the fundamentals of fluidization, with a view to its applications in the process and energy industries.
Fluidization Viii
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Author : Jean François Large
language : en
Publisher:
Release Date : 1996
Fluidization Viii written by Jean François Large and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Fluidization categories.
Computational Fluid Dynamics Cfd Simulation Of A Gas Solid Fluidized Bed Residence Time Validation Study
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Author : Baru Debtera
language : en
Publisher:
Release Date : 2021-11-05
Computational Fluid Dynamics Cfd Simulation Of A Gas Solid Fluidized Bed Residence Time Validation Study written by Baru Debtera and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-11-05 with categories.
Academic Paper from the year 2021 in the subject Physics - Mechanics, language: English, abstract: In this study, numerical simulations of a gas-solid fluidized bed reactor involving a two-fluid Eulerian multiphase model and incorporating the Kinetic Theory of Granular Flow (KTGF) for the solids phase have been performed using a commercial Computational Fluid Dynamics (CFD) software. The fluidized bed setup consists of 1,5 m height and 0,2 m diameter in which a series of experiments were performed using Helium tracer to determine the Residence Time Distribution (RTD) at various normalized velocities i.e., with different degrees of gas-solids mixing. Both 2D and 3D simulations of the fluidized bed reactor are performed. The main purpose of this study is to understand the hydrodynamic behavior of a gas-solid fluidized bed reactor through a framework of Eulerian multiphase model and to analyze hydrodynamic behavior of the gas-solids mixing.
Circulating Fluidized Beds
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Author : J.R. Grace
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Circulating Fluidized Beds written by J.R. Grace and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Since the late 1970s there has been an explosion of industrial and academic interest in circulating fluidized beds. In part, the attention has arisen due to the environmental advantages associated with CFB (circulating . fluidized bed) combustion systems, the incorporation of riser reactors employing cir culating fluidized bed technology in petroleum refineries for fluid catalytic cracking and, to a lesser extent, the successes of CFB technology for calcina tion reactions and Fischer-Tropsch synthesis. In part, it was also the case that too much attention had been devoted to bubbling fluidized beds and it was time to move on to more complex and more advantageous regime,S of operation. Since 1980 a number of CFB processes have been commercialized. There have been five successful International Circulating Fluidized Bed Confer ences beginning in 1985, the most recent taking place in Beijing in May 1996. In addition, we have witnessed a host of other papers on CFB funda mentals and applications in journals and other archival publications. There have also been several review papers and books on specific CFB topics. However, there has been no comprehensive book reviewing the field and attempting to provide an overview of both fundamentals and applications. The purpose of this book is to fill this vacuum.
Gas Liquid Solid Fluidization Engineering
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Author : Liang-Shih Fan
language : en
Publisher: Butterworth-Heinemann
Release Date : 1989
Gas Liquid Solid Fluidization Engineering written by Liang-Shih Fan and has been published by Butterworth-Heinemann this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Science categories.
This book provides a comprehensive mechanistic interpretation of the transport phenomena involved in various basic modes of gas-liquid-solid fluidization. These modes include, for example, those for three-phase fluidized beds, slurry columns, turbulent contact absorbers, and three-phase fluidized beds, slurry columns, turbulent contact absorbers, and three-phase transport. It summarizes the empirical correlations useful for predicting transport properties for each mode of of operation. Gas-Liquid-Solid Fluidization Engineering provides a comprehensive account of the state-of-the-art applications of the three-phase fluidization systems that are important in both small-and large-scale operations. These applications include fermentation, biological wastewater treatment, flue gas desulfurization and particulates removal, and resid hydrotreating. This book highlights the industrial implications of these applications. In addition, it discusses information gaps and future directions for research in this field.
Bubbling Fluidized Bed Hydrodynamics
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Author : Martin R Dis Li
language : en
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
Release Date : 2012-05
Bubbling Fluidized Bed Hydrodynamics written by Martin R Dis Li and has been published by Sudwestdeutscher Verlag Fur Hochschulschriften AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05 with categories.
Rising gas bubbles in bubbling fluidized beds are important for all hydrodynamics related phenomena, e.g. mass transfer, gas bypassing, heat transfer, gas-solids mixing, etc. However, still many interactions of bubbles with specific operation conditions in fluidized beds are unknown. In this work, fluidized beds with vertical heat exchangers are investigated. Vertical heat exchangers are in this case used to remove the heat of reaction from the exothermal methanation reaction for the production of synthetic natural gas (SNG) from wood. Several vertical tube bank configurations varying in their diameter, tube-to-tube spacing, and arrangement (square vs. triangular) have been immersed into a lab-scale fluidized bed. By means of optical probing and pressure fluctuation measurements, their influence on the rising gas bubbles has been evaluated by means of statistical tools. Findings from these experiments are furthermore used to develop a modified approach to scale up fluidized beds with vertical internals.
Hydrodynamics And Mass Transfer Studies In High Pressure Gas Liquid And Gas Liquid Solid Fluidization
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Author : Wai Man R. Lau
language : en
Publisher:
Release Date : 2003
Hydrodynamics And Mass Transfer Studies In High Pressure Gas Liquid And Gas Liquid Solid Fluidization written by Wai Man R. Lau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Fluidization categories.
Abstract: Slurry bubble columns and gas-solid fluidized bed reactors are some of the most commonly used industrial processes. Considerable interests have been recognized in the field of physical, chemical, petrochemical, electrochemical, and biochemical operations (Fan, 1989). In these reactor systems, large axial dispersion of phases and high flow patterns can be achieved by the excellent macromixing characteristics. It also provides excellent heat and mass transfer without the aid of external mechanisms and relatively easy operation. Despite the advantages of operations, the transport behavior in these systems is very complex and a comprehensive knowledge of the hydrodynamics, heat and mass transfer and mixing are required for successful application of these systems. Some aspects of the fundamental characteristics of evaporative liquid jets in gas-liquid-solid flows are studied and some pertinent literature is reviewed. It is found that the injection of an evaporative liquid jet decreases the minimum fluidization velocity at a high pressure due to the additional gas flow generated from liquid evaporation. Fluidizing gas velocities have no significant effect on the jet penetration length in a dense phase fluidized bed while it reduces the radial dispersed distance of the evaporative liquid. The tomographic images of liquid nitrogen injection in a dense phase fluidized bed indicate a distribution of reduced bubble sizes compared to a dry bed. The hydrodynamics, gas-liquid mass transfer properties and liquid entrainment phenomena in a high pressure and high temperature bubble column is investigated. Effects of pressure on hydrodynamics and mass transfer properties are mainly through the change in gas and liquid physical properties, which in turn changes the bubble dynamics that govern the transport phenomena. Experimental results show that liquid velocities have a direct influence on kl while other factors have a dominant effect on the interfacial area over kl. Liquid entrainment in bubble columns is controlled by the droplet formation during bubble bursting at interface. Effect of pressure on liquid entrainment is to due to the higher drag force exerted on the liquid droplet with higher gas density and the formation of smaller droplet by the smaller bubbles at high pressure.