(1) When the dryer is drying downstream, the saturated water vapor during the drying process cannot be discharged in time, and the water vapor runs too long in the drum, causing the water to be re-absorbed by the dry materials.
(2) The wind speed in the drum is low, resulting in weak dynamic and static contact between the material and the hot air, resulting in low efficiency of the drying equipment.
(3) To achieve the goal of achieving high output, the inlet temperature and outlet temperature are too high, resulting in a waste of energy. At the same time, the quality of the materials to be dried is reduced; the color of the materials is severely darkened; and there is even a lot of paste.
(4) In order to delineate the flow speed of the material in the direction of the outlet, the rotation speed of the drum is reduced. In this way, the number of times the material in the dryer drum is raised gradually decreases, and the number of dynamic contacts between the material and the hot air is also reduced accordingly.
(5) For high production, the dryer drum is made too long and the diameter is too large to make full use of it, resulting in loss of heat energy. At the same time, the dryer equipment occupies a large area and the investment is increased.
(6) The material will not "reciprocate" in the dryer drum, and the material in the drum will be sucked away by the wind, causing the storage volume of the material in the drum to be too low, and the dynamic and static contact area between the material and the hot air is reduced.
