抄録
The authors proposed a new method of fluidized bed drying using microwave heating. In this method, the microwave directly heats the moisture within the wet granule, and the fluidized bed is formed by wet granules so that they will be irradiated uniformly by the microwaves.
The temperature of outlet air was roughly in proportion to generating power during a constant rate period of drying. At the folling rate period of drying, the temperature of outlet air increase quickly.
The heating rate of water by microwave power agreeded very closely with the calculated value from generating power when 1kg of water was used.
It was necessary for high thermal efficiency to add generating power corresponding to the moisture content contained in the drying materials. The relationship between the fluidizing air rate and the constant rate of drying gave a straight line on log-log graph paper the rame as the characteristic of a usual fluidized bed.
It was clarified that granules were dried uniformly and rapidly by this drying method.
