Matters needing attention in dehumidification dryer in dry gas road
- Jul 30, 2018 -

In the drying gas path, the drying temperature should be measured at the material inlet in order to compensate for the heat loss of dehumidifier equipment in the hose. The air temperature at the entrance of the barrel may be due to the improper control of the controller and the lack of thermal insulation, or the failure of the heater element, the heater current contactor, the thermocouple, or the controller. In addition, monitoring the drying temperature throughout the drying process is also important.

If the material is not properly dried after the dryer is out of the dryer, it should be checked to see if there is enough space in the dry silo to provide sufficient and effective drying time. Effective drying time refers to the time when the particles are exposed to the appropriate drying temperature and dew point. If the particle is not enough in the silo, it will not get the proper drying. Therefore, attention should be paid to the size and shape of pellets or crushed materials, which will affect the bulk density and residence time of dry materials.

It is assumed that the drying time recommended by the material supplier is 4hr and the processing capacity is 100lb/h (1lb=0.4536Kg). To determine whether the dryer air flow is sufficient, you can measure the temperature curve in the drying bin, here, pay special attention to the temperature at 4 hr (400 lb). If the temperature of the 400lb position in the dry silo reaches the set value, the gas flow is considered sufficient (the editor: without the use of the raw material). If only 1 hr, 2 hr or 3 hr of material in the drying bin is fully heated, the air flow rate can not complete the heating and drying of the material at the predetermined yield. Insufficient heating may indicate that the drying barrel is too small for this productivity, or that air flow is limited by blockage of filters or damage to hoses. Too much gas will also cause problems. Not only will it waste energy, but also lead to high temperature of return air and destroy the performance of desiccant.

The reflux air filter can prevent filamentous material from polluting the runner and affect its moisture absorption performance. These filters must be kept clean to ensure adequate airflow.

When dry air comes out of the top of the dryer, most of the heat is released. When the desiccant temperature ranges from 120 ~150 to 48.8 ~65.5, most dryer can work efficiently. If the reflux air overheat the desiccant, it will reduce its adsorption capacity to moisture in dry air.

The reflux air temperature of the dryer should be measured at times. When the temperature of the reflux air is high, it may be explained that the size of the drier is too large or the temperature is high when the material enters the dry silo. For example, the PET has crystallized before drying, or only some material (such as PET) has a higher drying temperature than the normal temperature range. In order to prevent the temperature of reflux air from getting higher, it is necessary to install a heat exchanger on the reflux air path to ensure that the desiccant can effectively remove moisture from the dry air.


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