Fluid bed dryer-screener system
A new Circular Vibratory Fluid Bed Dryer-Screener System from Kason Corporation Europe reduces moisture content of bulk materials, removes agglomerates and dust, and discharges on-size material into bulk bags.
The pre-packaged system consists of a 1220 mm diameter circular fluid bed processor, heater, blower and 1220 mm diameter vibratory screener.
The circular fluid bed dryer is reportedly half the size and weight of a rectangular fluid bed dryer of equivalent capacity, and allows all primary system components to be consolidated on a shippable frame.
According to the company, inherent strength of the circular processor eliminates the need for heavy-gauge walls and cross braces otherwise required to withstand continuous vibration, allowing vibratory motors to be downsized. The circular unit also requires only one air inlet and outlet and has fewer weld seams, reducing overall size and construction cost, especially when finished to industrial, food, dairy and pharmaceutical standards.
Cleaning time is reportedly cut by more than 50 per cent due to the reduction in interior seams, and accessibility afforded by a quick-disconnect housing.
Material fed into the top inlet of the dryer descends into the fluid bed chamber where it vibrates on a circular screen within a rising column of heated air ducted into the bottom of the chamber from the upstream heater/blower. The continuous airflow, and vibration induced by two vibratory motors and spring suspension, separate and fluidise individual particles, maximising surface area and drying efficiency. The vibratory action also causes material to travel from the center of the screen to a discharge spout at the screen's periphery in controlled spiral pathways on a first-in-first-out basis, ultimately discharging dried material into the top-center inlet of the circular vibratory screener.
An imbalanced-weight gyratory motor positioned beneath the chamber of the screener vibrates two screening decks. Oversize particles travel in controlled spiral pathways from the center of the screen to a spout at the screen's periphery where they are discharged for reprocessing.
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