Abstract
A fluidized bed freezer and a fluidized bed dryer is described for freezing or drying 5 or 15kg batches of particulate food products using two sizes of plastic bed 30.4 or 45.7cm diameter. Fluidization velocities can be up to 243m/min in either bed.The freezer air temperature is controlled using hot gas bypass load cnotrol of the two stage condensing unit. Temperature control is within ±0.88°C throughout the range —17.8°C to —40°C. Freezing times for diced potatoes from 15.5°C to —23.5°C can be achieved in 7.0min for a 15kg sample and 3.5min for a 5kg sample from 12.8°C. Similarly, 3.0min and 6.2min were required for 5kg and 15kg samples of diced apples.The dryer air is steam heated producing air temperatures up to 127°C, controlled within ±2°C above 64°C by a pneumatic cam programmer. Drying times to 10% moisture were in the range 1.5 to 3.5h for 9.6mm cube diced potatoes or apples depending on test conditions.
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Schedule a callMore From: Canadian Institute of Food Science and Technology Journal/Journal de L'Institut Canadien de Science et Technologie Alimentaire
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