Agglomeration fluidized bed

There are primarily 3 methods by idiich powders can be increased in size in the fluidized bed — agglomeration by recrystallization, film forming binders, and layering. 

The maltodextrin solids are amorphous, white, or off-white powders or granules, which are non-sweet and odorless. The materials are processed by spray drying, fluidized bed agglomeration, and roller compaction to improve their handling properties. Maltodextrins are hygroscopic above 50% RH and need to be stored below... 

Figure 359. Comparison of typical particle size distributions obtained from spray drying (left) and fluidized bed agglomeration (right)...

Fig. 7.85 Schematic of a fluidized bed agglomerator for dry silica fume (courtesy Norchem Concrete Products, Fort Pierce, FL, USA).

B.70, pp. 15-24], The principle of this intensive, dry, fluidized bed agglomeration process is shown in Fig. 7.86. It consists of a cylindrical chamber with a perforated gas distribution plate at the bottom and operates in batch mode using cyclic fluidization and compaction of the material. 

Chapter 9 summarizes key information about equipment to increase or change the size of drops, bubbles and particles demisters, coalescers, flocculators, spray dryers, fluidized beds, agglomeration, pelletizing, extrusion, flakers, prilling and coating. 

Yang WC, Keairns DL. Design and operating parameters for a fluidized bed agglomerating combustor/gasifier. In Fluidization (Davidson JR, Keairns DL, eds.). Cambridge Cambridge University Press, 1978, pp 208-214. 

Drying and liquid penetration are also important for the process already discussed in Section 7.3.3, namely spray fluidized bed agglomeration. The reason for this is that agglomeration takes place with the help of droplets sprayed on the particles, so that it slows down when such droplets are lost either by evaporation (drying) or by liquid penetration into the porous substrate. Influences of this kind can be captured very well with the help of respective micro-scale models integrated into discrete simulations, as we will see in Section 7.7. 

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