Drying of Mixtures of Agricultural Wastes in a Conical Spouted Bed Contactor

With the aim of determining the applicability of conical spouted beds for drying of mixtures of agricultural wastes, stable operation conditions at low temperatures in the range of 25-50oC have been determined and the effect of moisture content and inlet gas temperature on bed stability has also been analyzed. The correlation already proposed for calculation of the minimum spouting velocity at room temperature has been proven to be valid at higher temperatures. The performance of the spouted bed dryer of mixtures of agricultural wastes has been analyzed as well as the effect of the operating conditions and the factors of greater influence in drying have been determined. Systems are stable in all studied experimental conditions. Spouted bed zone increases as moisture content decreases and as inlet gas temperature increases. In the temperature range of 40-50 oC drying time decreases as inlet gas temperature increases and moisture content decreases.

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