Plastic pellet double cone vacuum dryer

Wet feed is charged as a batch and is subjected to indirect heating while undergoing agitation due to the action of tumbling. The operation is normally carried out in a vacuum. Recovery of solvent is possible by condensing the vapors generated during the drying operation.
Rotary double cone vacuum dryers are suitable for drying & mixing powder (raw materials), pharmaceutical materials, crystalline products, insecticides, pesticides, food products & also for heat sensitive products.

The rotation of the double cone allows the product to be mixed without an internal agitator. It is completely jacketed and heat transfer fluid (either hot water or oil, stream or vapor) is circulated throughout the jacket to meet various Industrial drying requirement for temperature sensitive materials. The heat source (for example, low-pressure steam or thermal oil) pass through the sealed jacket. The raw material is charged in batches & is subjected to indirect heating while at the same time undergoing rotary motion of the cone assembly. The conical shape of the dryer ensures efficient circulation of hot liquid heating media. Drying takes place when heat flows from outer cone through a jacket, and vacuum is applied in the inner cone. The drying operation is based on the principle that water or other volatile product moves from a zone of low pressure. This is accomplished by warming the product to be dried to raise the vapor pressure of the absorbed or free liquid by vacuum or by sweeping it with Air or Nitrogen current. Thus the essential conditions for effective drying are achieved by uniform heat transfer throughout the batch and rapid removal of the vapor. The vacuum is applied gradually with PLC control by throttling.

It is suitable for drying of materials which cannot resist high temperature, material which is easily oxidized, specialty chemicals, volatile Materials which should be retrieved, materials which are strong irritants and poisonous in nature, solvents which need to be recovered.

In order to achieve rapid drying at low temperatures, including the drying of deep pores, in a way that does not damage the product, specialized drying technology – vacuum drying – must be used.

The complete product will move into the chamber. The pressure reduces for so long the saturated steam tension is reached. The water will discharge through the vacuum chamber from that point. The raw material is charged in batches & is subjected to indirect heating while at the same time undergoing rotary motion of the cone assembly. The double conical shape of the dryer ensures efficient circulation of hot liquid heating media. Drying takes place when heat flows from the outer cone through a jacket, and vacuum is applied in the inner cone. The drying operation is based on the principle that water or other volatile product moves from a zone of low pressure. This is accomplished by warming the product to be dried to raise the vapor pressure of the absorbed or free liquid by vacuum or by sweeping it with Air or Nitrogen current. Thus the essential conditions for effective drying are achieved by uniform heat transfer throughout the batch and rapid removal of the vapor. The vacuum is applied gradually with PLC control by throttling.

Most times the specific heat from the evaporating product is lower than from the base material. This material ensures that the temperature will drop slowly or even not. The pressure (vacuum) will achieve any part of the product so the moisture will evaporate. For a short period there results in a homogeneous temperature.

Technical Parameters

1. This rotary vacuum dryer has an advanced design, a simple internal structure, convenient to clean and easy to handle.

2. The tubes of heating medium and vacuum system are built in the rack in order to prevent artificial damage and difficult clean.

3. The outer wall and rack sealing plate adopt polishing treatment, and the inner container adopts mirror-polishing treatment.

4. The materials in the double cone vacuum dryer can be rotated due to the revolution of the machine, which can minimize material water content (≤0.5%).

5. The materials will not stick to the wall of the container. With big drying rate and energy saving, this rotary vacuum dryer can uniformly and sufficiently dry the materials.

6. Condenser and recycling tank are equipped for recovering organic solvent.

7. Our double cone vacuum dryer has three types of heat source, including steam, hot water, and conduction oil.

SZG double cone rotating vacuum dryer is applicable for drying and mixing powder and granular materials in the pharmaceutical, food, chemical, dye and other industries. It is especially suitable for the following materials:
1. Thermo-sensitive materials that cannot withstand high temperature
2. Easily oxidized and dangerous materials
3. Materials whose solvent should be recovered and materials of poisonous gas
4. Materials required low residual volatile content
5. Materials with requirements on crystal shape

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91.8% Response Rate