Modelling on Gas-solid Fluidization in Bubbling Fluidized Beds and Circulating Fluidized Beds PDF Download
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Author: Md. Mizanur Rahman
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
A fluidization model was developed by adopting the transport equations of the gas and solid phases and the constitutive relations for the solid phase derived by Ding [1]. Finite difference method was used for the numerical solution of the set of partial differential equations governing the gas solid two-phase flow. The develop model has the capability of treating a variety of boundary and initial conditions. The model was applied for the simulation of bubbling fluidization with a rectangular obstacle over a central jet and uniform gas distribution system a in a two-dimensional bed. The model was also applied for the computation of circulating fluidized (CFB) and to observe the effect of particle inelasticity on the hydrodynamics of CFB.
Author: Md. Mizanur Rahman
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
A fluidization model was developed by adopting the transport equations of the gas and solid phases and the constitutive relations for the solid phase derived by Ding [1]. Finite difference method was used for the numerical solution of the set of partial differential equations governing the gas solid two-phase flow. The develop model has the capability of treating a variety of boundary and initial conditions. The model was applied for the simulation of bubbling fluidization with a rectangular obstacle over a central jet and uniform gas distribution system a in a two-dimensional bed. The model was also applied for the computation of circulating fluidized (CFB) and to observe the effect of particle inelasticity on the hydrodynamics of CFB.
Author: Liang-Shih Fan
Publisher: Butterworth-Heinemann
ISBN: 1483289516
Category : Technology & Engineering
Languages : en
Pages : 784
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Book Description
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 forresearch in this field.
Author: Robert W. Hughes
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages : 290
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Book Description
Author: John R. Grace
Publisher: John Wiley & Sons
ISBN: 3527340645
Category : Technology & Engineering
Languages : en
Pages : 626
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Book Description
A concise and clear treatment of the fundamentals of fluidization, with a view to its applications in the process and energy industries.
Author: Dimitri Gidaspow
Publisher: Elsevier
ISBN: 0080512267
Category : Science
Languages : en
Pages : 489
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Book Description
Useful as a reference for engineers in industry and as an advanced level text for graduate engineering students, Multiphase Flow and Fluidization takes the reader beyond the theoretical to demonstrate how multiphase flow equations can be used to provide applied, practical, predictive solutions to industrial fluidization problems. Written to help advance progress in the emerging science of multiphase flow, this book begins with the development of the conservation laws and moves on through kinetic theory, clarifying many physical concepts (such as particulate viscosity and solids pressure) and introducing the new dependent variable--the volume fraction of the dispersed phase. Exercises at the end of each chapterare provided for further study and lead into applications not covered in the text itself. Treats fluidization as a branch of transport phenomena Demonstrates how to do transient, multidimensional simulation of multiphase processes The first book to apply kinetic theory to flow of particulates Is the only book to discuss numerical stability of multiphase equations and whether or not such equations are well-posed Explains the origin of bubbles and the concept of critical granular flow Presents clearly written exercises at the end of each chapter to facilitate understanding and further study
Author: P. Basu
Publisher: Elsevier
ISBN: 1483286347
Category : Science
Languages : en
Pages : 465
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Book Description
This volume focuses on the present status of circulating fluidized bed technology and provides design information not available elsewhere. Areas covered include combustion of fossil fuel, hydrodynamics, combustion and environmental pollution, design and operating experiences, heat transfer and hydrodynamics, and process applications.
Author: D. Kunii
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 572
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Book Description
Author: Bing Du
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages :
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Book Description
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.
Author: John G. Yates
Publisher: Springer
ISBN: 3319395939
Category : Science
Languages : en
Pages : 214
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Book Description
The fluidized-bed reactor is the centerpiece of industrial fluidization processes. This book focuses on the design and operation of fluidized beds in many different industrial processes, emphasizing the rationale for choosing fluidized beds for each particular process. The book starts with a brief history of fluidization from its inception in the 1940’s. The authors present both the fluid dynamics of gas-solid fluidized beds and the extensive experimental studies of operating systems and they set them in the context of operating processes that use fluid-bed reactors. Chemical engineering students and postdocs as well as practicing engineers will find great interest in this book.
Author: D. Kunii
Publisher: Elsevier
ISBN: 008050664X
Category : Science
Languages : en
Pages : 520
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Book Description
Fluidization Engineering, Second Edition, expands on its original scope to encompass these new areas and introduces reactor models specifically for these contacting regimes. Completely revised and updated, it is essentially a new book. Its aim is to distill from the thousands of studies those particular developments that are pertinent for the engineer concerned with predictive methods, for the designer, and for the user and potential user of fluidized beds. Covers the recent advances in the field of fluidization. Presents the studies of developments necessary to the engineers, designers, and users of fluidized beds.
