When inspecting your vacuum dryer, pay special attention to the air filter and hoses. A clogged filter or a squashed hose can reduce airflow, affecting operation; a damaged filter can contaminate the desiccant, inhibiting its ability to absorb moisture; a ruptured hose can introduce moist ambient air into the drying airflow, Causes premature moisture absorption and high dew point of the desiccant; poorly insulated hoses and drying bins can also affect drying temperatures.
In the drying air circuit, the drying temperature should be detected at the inlet of the silo in order to compensate for the heat loss of the vacuum dryer in the hose. Low air temperature at the silo inlet may be due to improper adjustment of the controller and lack of insulation, or a faulty heater element, heater contactor, thermocouple, or controller. In addition, it is important to monitor the drying temperature throughout the drying process and observe temperature fluctuations when the desiccant is changed.
If the material is not properly dried after coming out of the vacuum dryer, it should be checked whether the drying silo has enough space to provide sufficient and effective drying time. Effective drying time refers to the time the particles are actually exposed to the appropriate drying temperature and dew point. If the particles do not stay in the silo for an insufficient amount of time, proper drying will not be achieved. Therefore, attention should be paid to the size and shape of the granular or crushed material, which will affect the bulk density and residence time of the dry material.
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