Fluidized bed offers significant advantages over other drying techniques. The temperature of the bed layers is uniform, and so is the temperature distributing along the moving direction of the com. And it is easy to control the temperature, then high heat and mass transfer rates are possible. So the heating velocity of the fluidized bed is high, and the high production can be achieved. It is also benificial that the quality of the com is not damaged. So we chose the fluidized bed as the dryer and mainly stu...