Spray fluidizer

Bottom-fermenting yeasts, 26 465 Bottom-pressure casting method, 23 269 Bottom-spray fluidized-bed units, 16 448-449... 

Dewettinck, K. and Huyghebaert, A., Top-spray fluidized bed coating effect of process variables on coating efficiency, Lebensmittel Wissenschaft Technologie, 31 (1998) 568-575. 

Dewettinck, K., De Visscher, A., Deroo, L. and Huyghebaert, A., Modeling the steady-state thermodynamic operation point of top-spray fluidized bed processing, /. Food Eng., 39 (1999b) 131-143. 

Jones DM. Effect of process air dew point on a top-spray fluidized bed-coating process. Presented in Session 265 Coating in the pharmaceutical industry. Proceedings of AIChE Annual Meeting, 1998. 

Coating procedure, top spray (Fluidized bed Aeromatic Strea-1)... 

Many reports have been made on experimental and theoretical investigations in the area of liquid sprayed-fluidized beds by Heinrich [30], who dealt comprehensively with the modeling of heat and mass transfers, as well as with particle populations in the fluidized beds. 

It is clear from Fig. 16.57 that the conversions can be realized up to 90 % for small NTU of 3 in a liquid-sprayed fluidized bed. It also shows that the assumption of ideal plug flow of gas (PFTR) is more appropriate than the assumption of ideal mixing of the gas (CSTR). 

In the present studies, the possibility of realizing absorption processes with reactive conversion of the absorbed gas component in liquid-sprayed fluidized beds is investigated. The goal of this new technology is the production of a free-floating product and a simultaneous high conversion of the absorbed gas component. The main subject of these studies is the experimental investigation of reactive absorption and... 

If sufficient calcium hydroxide is present in the spraying drop, then the diffusion of sulfur dioxide is small. In liquid-sprayed fluidized beds the drops or films on the particles are under permanent stresses, and particle-particle impacts lead to constant destruction of the film surface. Thus, no converted calcium hydroxide reaches the film surface to perform the reaction for disposal, and consequently a strongly over-stoichiometric process is not necessary. 

The average particle diameter which is growing during granulation and agglomeration has no effect on the conversion of sulfur dioxide. An increase in particle diameter leads to higher Re-numbers, and thus to an enhanced mass transfer of sulfur dioxide. However, the opposite phenomenon is that the increased mass transfer of the evaporation reduces the mass transfer surface. In addition, these experimental studies illustrate that the liquid-sprayed fluidized bed can be used as a reactive absorber. 

M. Henneberg, et ah, Study of dynamic multi-dimensional temperature and concentration distributions in liquid sprayed fluidized beds, Chem. Eng. Sci.,... 

FIGURE 2 A representative example of a conventional top. spray fluidized bed processor. Source Courtesy of Glatt Air Techniques, Inc. 

Granulate substance I in a top spray fluidized bed with dispersion II (Inlet air temperature 50 °C, outlet air temperature about 26 °C, nozzle 1.2 mm), mix with III and press to tablets with low compression force (9 kN) on a rotary press. ... 

Figure 162. Arrangement drawing of a Niro spray fluidizer for the production of approximately 650 kg/h of granular zinc sulfate monohydrate with a particle size between 1.5 and 3 mm from 2600 kg/h solution ...

When the product coming out of the spray dryer is too fine it does not wet readily and so is harder to reconstitute. To make the product more readily soluble, it is agglomerated in a small fluidized or vibrated fluidized bed, as shown in Figure 23.23. This two-stage arrangement is used in the production of instant coffee, milk powder, cocoa, etc. An extension of this basic concept is the so-called spray-fluidizer, which dries the material in two stages. In the first stage (spray dryer). 

Fig. 5.13 Sketch of the material processing section of a bottom spray fluidized bed coater (Wurster coating system) [B.71]...

D. M. Lipps and A. M. Sakr, Characterization of wet granulation process parameters using response surface methodology. 1. Top-spray fluidized bed, J. Pharm. Sci., 83, 937-947 (1994). 

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