On the Drying Characteristics of Common Salt in the Continuous Fluidized Bed

SUWA Koichiro, ICHINOSE Miyozo, ISOZAKI Mitsuru

doi:10.11457/swsj1950.15.5-6_215

The drying characteristics of common salt in the fluidized bed was studied using washed salt and flake salt in the single-stage test apparatus. (1) With the increase of air velocity in column, air temperature and mean resident time of material, the water content of product became low. (2) The heat transfer capacity coefficients on the basis of weight of material is expressed by the following experimental formula. ha′H:=0.001Δp0.75G_T^1.25 h: film heat transfer coefficient (kcal/m²hr°C), a′: effective heat transfer area per unit weight of material (m²/kg), H: weight of the resident material per unit area (kg/m²), Δp: pressure drop in fluidized bed (kg/m²), G_T: quantity of air per unit area (3) The heat efficiency in this type dryer was found to be equal to that of pneumatic conveying dryer. (4) Size reduction of crystals was a little in case of flake salt. In the washed salt, the crystals was apt to agglomerate and this tendency was remarkable with the increase of air temperature or decrease of air velocity. (5) The weight of resident material in fluidized bed was found to be equal to its pressure drop, and the relation between its material weight and height of over-flow outlet may be expressed by the following experimental formula. H=398lu^-0.79 l: height of over-flow out let (m), u: air velocity (m/sec) (6) From the observation of fluidized bed, the suitable air velocity was about 0.75m/sec.

On the Drying Characteristics of Common Salt in the Continuous Fluidized Bed

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