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Hydrodynamics And Scale Up Of Circulating Fluidized Beds Microform
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Author :Aijie Yan Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780612968851 Total Pages :550 pages Book Rating :4.9/5 (688 download)
Book Synopsis Hydrodynamics and Scale-up of Circulating Fluidized Beds [microform] by : Aijie Yan
Download or read book Hydrodynamics and Scale-up of Circulating Fluidized Beds [microform] written by Aijie Yan and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scale-up effect on the hydrodynamics of gas-solids circulating fluidized bed riser reactors of different riser diameters was systematically studied in two 10 m high, 76 mm and 203 mm internal diameter risers by measuring the pressure drops, solids holdup, particle velocity, and solids flux with pressure transducers, a reflective-type fiber optic concentration-probe, a five-fiber optic velocity probe and a non-isokinetic sampling probe. A large number of measurements from the two risers with special design features of solids inlet valve make it possible to obtain information over a wide range of riser operating conditions. The similarities and differences in the flow behaviours of the two risers are clearly observed. Solids concentration increases with the increase of riser diameter, while the cross-sectional average particle velocity decreases somewhat for the larger riser. Meanwhile, a larger riser has steeper radial profiles for solids concentration, particle velocity and solids flux at each axial level. Asymmetry of the radial profiles of solids concentration and particle velocity at both entrance and exit regions are also observed. Such asymmetry is much stronger with higher flux. For both risers, the flow development in the riser centre is nearly instantaneous at the riser bottom under all operating conditions and there is no significant difference for the two risers in the center region throughout the riser. On the other hand, in the wall region, the flow development slows down for both risers, and such a slow down is much more significant for the larger riser. In the wall region, the solids holdup of the 8 inch riser is higher than that of the 3 inch riser, but the particle velocity is lower. The downflow solids flux at the wall of the larger riser is higher. The solids inventory and riser diameter appears to have little influence on the shape of the axial profile, but the average solids holdup is higher with higher solids inventory. The maximum of operable solids fluxes increases with the increase of solids inventory and decreases with the increase of riser diameter. Increasing solids flux also slows down the flow development, but increasing superficial gas velocity makes the flow development faster. Based upon the theoretical analyses and the systematic experimental data obtained in this study, a series of correlations is proposed to predict the radial profiles of particle velocity and solids holdup for the CFB riser reactors. In all locations measured, there was a clear dependence between the local particle velocity and solids concentration of both risers. Gas distribution and particle aggregation are considered the key factors that affect the local hydrodynamics in the twin-riser system. The information obtained from this study could be beneficial, especially for FCC industrial design and operation.
Book Synopsis Effect of Inclination on Hydrodynamics in Bubble Columns and Fluidized Beds by : Cheryl L. Hudson
Download or read book Effect of Inclination on Hydrodynamics in Bubble Columns and Fluidized Beds written by Cheryl L. Hudson and published by . This book was released on 1996 with total page 1748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling the Hydrodynamics of Large-scale Circulating Fluidized Bed Risers by : Suneel Krishan Gupta
Download or read book Modeling the Hydrodynamics of Large-scale Circulating Fluidized Bed Risers written by Suneel Krishan Gupta and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamic Scaling and Cyclone Performance of Pressurized Circulating Fluidized Beds by : Vincent Gerard Bricout
Download or read book Hydrodynamic Scaling and Cyclone Performance of Pressurized Circulating Fluidized Beds written by Vincent Gerard Bricout and published by . This book was released on 2000 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scale-up and Hydrodynamics of Fluidized Beds with Fractal-Like Injectors by : Yi Cheng
Download or read book Scale-up and Hydrodynamics of Fluidized Beds with Fractal-Like Injectors written by Yi Cheng and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Circulating Fluidized Beds by : J.R. Grace
Download or read book Circulating Fluidized Beds written by J.R. Grace and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Fluid Dynamics and Heat Transfer in Circulating Fluidized Beds by : Shihui Zhou
Download or read book Fluid Dynamics and Heat Transfer in Circulating Fluidized Beds written by Shihui Zhou and published by . This book was released on 1992 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new theoretical approach to the modelling of the upward flow of gas-particle suspensions is presented. In this, the proposed theory is used to predict suspension concentration, radial gas and solids velocities, axial gas and solids velocities. This thesis provides a general expression for slip velocity between gas and solids phases. The equivalence of pressure gradient with suspension concentration is demonstrated. The experimentally observed existence of core-annulus flow structure, a rapidly- rising dilute core surrounded by a slowly-falling denser annulus adjacent to the pipe walls, in vertical risers is predicted by the theory. Sodium chloride tracer impulse injection was used to measure the longitudinal solids mixing in circulating fluidized bed risers of internal diameter 0.152 and 0.305m at superficial gas velocity from 2.8 to 5.0 m/s for mean solids circulation flux from 5.0 to 80 kg/m2s. The measured solids mixing data were satisfactorily described by a simple one-dimensional dispersion model which permits residence time distribution curves to be calculated directly from a knowledge of operating conditions. The degree of longitudinal solids mixing in the riser is found to decrease with increase in riser diameter. The measurement of instantaneous local temperature fluctuation traces and mean thermal boundary layers was conducted with a special probe for various operating conditions. A mechanism, in which eddying particle cloud swarms and gas packets are pictured as the receptors of heat, and relatively steady conduction of heat and unsteady random transport of heat play the principal roles in the wall-to-suspension heat transfer, is proposed and is analyzed mathematically. Overall heat transfer coefficients were measured on 0.180 m long heat transfer section in two scale cold model circulating fluidized bed risers at several temperature differences for ... powder at superfical gas velocity from 1.96 to 5.66 m/s, and for solids circulation fluxes up to 118.54 kg/m2s. Average heat transfer coefficients increase with suspension concentration which ranged from 0 to 86.09 kg/m3, and decrease with heat transfer temperature difference, Tw - Tb, which ranged from 12 to 121.5 degrees C Heat transfer coefficients are found to increase with riser diameter.
Author :Martin R Dis Li Publisher :Sudwestdeutscher Verlag Fur Hochschulschriften AG ISBN 13 :9783838133218 Total Pages :372 pages Book Rating :4.1/5 (332 download)
Book Synopsis Bubbling Fluidized Bed Hydrodynamics by : Martin R Dis Li
Download or read book Bubbling Fluidized Bed Hydrodynamics written by Martin R Dis Li and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2012-05 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Hydrodynamics of Circulating Fluidized Beds by : Benjamin James Harris
Download or read book The Hydrodynamics of Circulating Fluidized Beds written by Benjamin James Harris and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scaling and Lateral Solid Mixing in Circulating Fluidized Beds by : Detlef Westphalen
Download or read book Scaling and Lateral Solid Mixing in Circulating Fluidized Beds written by Detlef Westphalen and published by . This book was released on 1993 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Helen Nancy Tanfara Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 : Total Pages :314 pages Book Rating :4.:/5 (27 download)
Book Synopsis Hydrodynamics of Fluidized Beds Used in the Pharmaceutical Industry [microform] by : Helen Nancy Tanfara
Download or read book Hydrodynamics of Fluidized Beds Used in the Pharmaceutical Industry [microform] written by Helen Nancy Tanfara and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2001 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study on the Hydrodynamics in the Riser of a Circulating Fluidized Bed by : Heping Yang
Download or read book Experimental Study on the Hydrodynamics in the Riser of a Circulating Fluidized Bed written by Heping Yang and published by . This book was released on 1995 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Mohammad Asif Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780315668812 Total Pages :636 pages Book Rating :4.6/5 (688 download)
Book Synopsis Hydrodynamics of Liquid Fluidized Beds Including Distributor Effects [microform] by : Mohammad Asif
Download or read book Hydrodynamics of Liquid Fluidized Beds Including Distributor Effects [microform] written by Mohammad Asif and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1991 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of Circulating Fluidized Beds by : P. M. Laussmann
Download or read book Hydrodynamics of Circulating Fluidized Beds written by P. M. Laussmann and published by . This book was released on 1990 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of Circulating Fluidized Bed with Internals by : Mohamed Ahmed Salah
Download or read book Hydrodynamics of Circulating Fluidized Bed with Internals written by Mohamed Ahmed Salah and published by . This book was released on 1995 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Image Analysis of Circulating Fluidized Bed Hydrodynamics by : David Kent Casleton
Download or read book Image Analysis of Circulating Fluidized Bed Hydrodynamics written by David Kent Casleton and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of a Cold Circulating Fluidized Bed by : Jianxun Deng
Download or read book Hydrodynamics of a Cold Circulating Fluidized Bed written by Jianxun Deng and published by . This book was released on 1997 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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