News Center
Dehumidifying dryers are mainly used to dry plastics with strong moisture absorption. Dehumidifying dryers send low dew point air that has been dehumidified into one or more standard drying hoppers to improve drying efficiency and shorten drying time. The dehumidification dryer uses a fan to draw humid air into the machine, which is then heated? At this point, the water in the air condenses into water droplets, which become dry air and are discharged from the machine. This cycle reduces indoor humidity.
Assuming that the material supplier of the dehumidification dryer recommends a drying time of 4 hours and a processing capacity of 100 lb/h (1 lb=0.4536 kg). To determine whether the airflow of the dehumidification dryer is sufficient, the temperature curve inside the drying silo can be measured. Here, special attention should be paid to the temperature at 4hr (400lb). If the temperature at the 400lb material level in the drying bin of the dehumidification dryer reaches the set value, it can be considered that the air flow rate is sufficient (Editor: The dehumidification dryer does not use raw materials). If only the material at 1hr, 2hr, or 3hr in the drying silo is fully heated, it indicates that the gas flow rate cannot complete the heating and drying of the material at the predetermined yield. Insufficient heating may indicate that for the productivity of the dehumidification dryer, the drying drum is too small, or the airflow is restricted due to clogged filters or damaged hoses. Excessive air volume can also cause problems, not only wasting energy, but also leading to high return air temperature and damaging the performance of the desiccant.
If the material has not been properly dried after coming out of the dehumidification dryer, it should be checked whether the drying silo has sufficient space to provide sufficient and effective drying time. The effective drying time of a dehumidification dryer refers to the time that particles are actually exposed to appropriate drying temperatures and dew points.
If the retention time of particles in the dehumidification dryer silo is not enough, they cannot be properly dried. Therefore, attention should be paid to the size and shape of granular or crushed materials, as they can affect the stacking density and residence time of dried materials. The return air filter of the dehumidification dryer can prevent filamentous materials from contaminating the impeller and affecting its moisture absorption performance. These dehumidification dryer filters must be kept clean to ensure sufficient airflow.
