POWDER TECHNOLOGY Particle mixing and separation in a binary solids floating fluidized bed

POWDER TECHNOLOGY Particle mixing and separation in a binary solids floating fluidized bed

13 Pages · 2003 · 1.12 MB · English

a Gist-Brocades N~, PO Box L 2600 MA Delft, The Netherlands b Twente University of Technology, PO Box 217, 7500 AE Enschede, The Netherlands. Received 5 January 1994; revised 31 October 1994. Abstract. The floating gas-solid fluidized bed (FGSFB) is a large-particle fluidized bed confined in a 

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ELSEVIER Powder Technology 82 (1995) 279291 POWDER TECHNOLOGY Particle mixing and separation in a binary solids floating fluidized bed G Kwant a W Prins b WPM van Swaaij b a GistBrocades N~, PO Box L 2600 MA Delft, The Netherlands b Twente University of Technology, PO Box 217, 7500 AE Enschede, The Netherlands Received 5 January 1994; revised 31 October 1994 Abstract The floating gassolid fluidized bed (FGSFB) is a largeparticle fluidized bed confined in a tapered column with inserted grids By application of two types of particles in an FGSFB, a wide variety of operations can be carried out The visual appearance and the hydrodynamic behaviour of such binary FGSFBs is reported in this paper Two extreme types of behaviour were observed in the experimental setup: (1) almost complete separation occurs in beds of two types of particle with the same diameter but a particle density ratio pp2/Pp 1 of ca 2 (±1400 vs±700 kg/m3); (2) a relatively wellmixed situation is found in beds with two types of particle having the same density but a particle diameter ratio dp2dp,~ of ca 2 (30 vs 17 mm) Experimentally determined pressure gradient values were always within the range of those measured for FGSFBs of the singleparticle type A measure for the separating force, the socalled separation tendency W, is derived and shown to be quantified by singleparticle properties Its value can be used to predict whether complete or intermediate mixing occurs, or if the binary FGSFB will be completely separated Keywords: Fluidized bed; Binary particles; Tapered column; Porosity distribution; Mixing; Segregation 1 Introduction The floating gassolids fluidized bed (FGSFB) \[1,2\] is a new development in gassolids contactors Particles are fluidized by a gas in a tapered column in which grid inserts ensure a certain degree of bed stabilization At the bottom of the column, a gas velocity higher than the singleparticle terminal velocity is required because there is no gasdistributing bottom plate The superficial gas velocity decreases towards the top of the bed but always remains higher than the minimum fluidization velocity The FGSFB offers the possibility of operation with an inventory of two or more types of particle A wide variety of applications can be carried out if different, for instance two, types of particle are used One may apply: different types of catalyst material, a catalyst in combination with either a product adsorbent or a reactant desorbent, a wellmixed bed or two completely separated beds, * Corresponding author continuous replacement of either one or both types of particle, continuous trickling down (up) of a heavier (lighter) particle type through a stationary bed, one particle type as a heat carrier A combination of various items in this list is possible and sometimes even required for continuous processes, eg continuous product adsorption can only be realized if particle replacement also takes place The reader may note that the classifying property of the tapered FGSFB can be combined beneficially with the different (physico)chemical characteristics (eg catalytic activity, adsorptive capacity) of the types of particles used in most of the abovementioned cases A propitious application of two catalyst materials in an FGSFB column is illustrated by the following ex ample The FGSFB is a possible alternative for the parallel passage systems, applied at present to carry out the selective catalytic reduction (SCR) of NOx by ammonia in flue gas from coalfired boilers In the SCR process, a high NOx reduction is preferred while only a very small NH3slip (<5 vppm) is allowed to avoid condensation of ammonia sulfates in cool 00325910/95/$0950 © 1995 Elsevier Science SA All rights

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