Download e-book for iPad: Circulating Fluidized Beds by John R. Grace, Hsiaotao Bi (auth.), J. R. Grace, A. A.

By John R. Grace, Hsiaotao Bi (auth.), J. R. Grace, A. A. Avidan, T. M. Knowlton (eds.)

ISBN-10: 9400900953

ISBN-13: 9789400900950

ISBN-10: 9401065306

ISBN-13: 9789401065306

Since the overdue Nineteen Seventies there was an explosion of business and educational curiosity in circulating fluidized beds. partially, the eye has arisen as a result environmental merits linked to CFB (circulating . fluidized mattress) combustion platforms, the incorporation of riser reactors making use of cir­ culating fluidized mattress know-how in petroleum refineries for fluid catalytic cracking and, to a lesser volume, the successes of CFB expertise for calcina­ tion reactions and Fischer-Tropsch synthesis. partially, it was once additionally the case that an excessive amount of recognition were dedicated to effervescent fluidized beds and it used to be time to maneuver directly to extra complicated and enhanced regime,S of operation. because 1980 a few CFB strategies were commercialized. there were 5 profitable overseas Circulating Fluidized mattress Confer­ ences starting in 1985, the latest occurring in Beijing in could 1996. furthermore, we have now witnessed a number of different papers on CFB funda­ mentals and purposes in journals and different archival courses. There have additionally been a number of evaluation papers and books on particular CFB themes. even though, there was no complete ebook reviewing the sphere and trying to offer an outline of either basics and functions. the aim of this publication is to fill this vacuum.

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Extra resources for Circulating Fluidized Beds

Sample text

Accordingly, early experiments were done in tall columns of a large length to diameter ratio; L/ D" with smooth recycle of solids into their risers (cf. , 1976b). This tended to focus attention on the nature of the long dense region formed in a vessel of a large L/ D, ratio, which might not be appreciated by people working on combustor designs. The differences between catalytic reactors and boilers are not only limited to the riser conditions, but a big difference may also exist in the downcomer.

7 50 en CII cuen CIIen 00 Uo on en ...... 3 o I-------'b( Jl1z .... r. I ~ KM J L I>- _. 23 Continued. 5m 46 CIRCULATING FLUIDIZED BEDS dense region height and, accordingly, the radial void age and velocity distributions can vary depending on column design and operating conditions. 23 the formation of the downflow over the wall (see H-Q) and the intermittent upflow and downflow (E, F, Q) can be confirmed. For convenience, the time-averaged solid downflowing area is called the annulus and the rest is the core.

600~608. W. and Gau, G. (1986) Simulation of ethylene epoxidation in a multitubular transport reactor. Chern. Eng. , 41, 143~150. , Arnaldos, J. and Casal, J. (1991) On the transition from bubbling to fast fluidization regimes, in Circulating Fluidized Bed Technology III (eds P. Basu, M. Horio and M. Hasatani), Pergamon Press, Toronto, pp. 73~ 78. Reh, L. (1971) Fluid bed processing. Chern. Eng. , 67, 58~63. Reh, L. (1986) The circulating fluid bed reactor ~ a key to efficient gas/solid processing, in Circulating Fluidized Bed Technology (ed.

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Circulating Fluidized Beds by John R. Grace, Hsiaotao Bi (auth.), J. R. Grace, A. A. Avidan, T. M. Knowlton (eds.)

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