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By P. Basu

This quantity makes a speciality of the current prestige of circulating fluidized mattress expertise and offers layout info no longer on hand somewhere else. components coated comprise combustion of fossil gas, hydrodynamics, combustion and environmental pollutants, layout and working stories, warmth move and hydrodynamics, and method functions.

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Additional resources for Circulating Fluidized Bed Technology. Proceedings of the First International Conference on Circulating Fluidized Beds, Halifax, Nova Scotia, Canada, November 18–20, 1985

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1974), Yerushalmi et al. (1978), Canada et al. (1978) and is now used widely (see, for example, Chap. 8 in Hetsroni (1982). We have done work on more than 20 different solids in five rigs, and have come to the conclusion that the term has been applied to at least two, and possibly three regimes; which is seen depends on the equipment, how and where the observations are made, and the particle properties. The importance of the latter is well-known but the influence of the other factors has not been widely appreciated and some authors give insufficient information.

We used a wide range of solids and these are listed in Table 1. The amplitude of the pressure fluctuations depends on the size of the bubbles/ slugs and on the amount of solids above the measuring probes. As the gas velocity is increased bubbles grow larger, the bed depth increases and pressure fluctuations increase. Solids are flung higher and higher, and spend an increasing proportion of time in the freeboard, expanded section and cyclone. This results in a reduction in the amount of solids in the 'bed' region.

L. C. F. (1964) I. C. J. (1980) in "Fluidization" ed. R. M. Y. C. E. Annual Meeting, Los Angeles Yerushalmi, J. M. E. Symp. , 73, No. , and Liss, B. E. Symp. Ser. 74, No. A. F. Y. p. 283 NOTATION D g G Bed diameter Acceleration due to gravity Solids circulation flux m m/s kg/m s H U U Bed height Superficial gas velocity Superficial gas velocity at maximum amplitude of pressure fluctuations Superficial gas velocity at onset of choking m m/s m/s Superficial gas velocity marking the point at which the amplitude of pressure fluctuations levels out at low value m/s V Slip velocity Particle terminal velocity m/s m/s ε Voidage U U U SLIP m/s ε Voidage at onset of choking p Gas density kg/m p Particle density kg/m p Mean solids hold-up kg/m P 3 ACKNOWLEDGEMENT The authors wish to thank the Science and Engineering Research Council for the financial support which has made possible the experimental work at Bradford University.

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