Classification of Fluidized Bed Dryer and Applicable Materials (Part I)--Ze Xiefang, General Manager of Vanguard Drying Co., Ltd.

With the continuous development of the application technology of fluidized bed drying equipment, there are more and more types and adaptable materials, which have been widely used in the chemical, light industry, medicine, food and other industries. Due to the different requirements of different materials and products for drying, different types of fluidized bed dryers have emerged. According to its type, it is as follows.
1. Single-layer fluidized bed dryer
The single-layer fluidized bed dryer is the simplest type and can be divided into continuous and intermittent operation methods. Continuous operation has a wide distribution of residence time, so it is often used in products that are easier to dry, or products that do not have stringent requirements for drying. Intermittent operation can be used for the drying of materials with higher moisture content; for some materials with uneven granularity and certain viscosity, low bed operations with stirrers in the bed are mostly used.
The equipment is simple in operation, convenient in maintenance, stable in bed temperature and good in drying effect, but it has a long operating cycle. This machine is suitable for the drying of materials such as ammonium sulfate, ammonium chloride, anhydrous sodium sulfite, polytetrafluoroethylene, calcium gluconate, alkaline chrysin dyes, catalyst particles, anhydride casein, coconut, and salt.
2. Multi-layer fluidized bed dryer
Multi-layer fluidized bed dryers have a uniform residence time, so the actual drying time required is shorter than that of single-layer fluidized beds. The uniformity of the moisture content of the dried product can be improved, and the drying quality of the product can be easily controlled. However, due to the increase in the number of layers in the multi-layer fluidized bed dryer, a stable fluidization state must be ensured between the layers, which increases the complexity of the equipment structure. For removing water-binding materials, it is appropriate to use a multi-layered fluidized bed.
Multi-layer fluidized bed dryer is suitable for the drying of powdery granular materials such as polyester chips, sodium salicylate, aminopillin, oxytetracycline, chlortetracycline, tetracycline, tablet starch granules, powdered sugar, feed, plastics, food, etc. .
3. The horizontal multi-chamber fluidized bed dryer horizontal multi-chamber fluidized bed dryer overcomes the disadvantages of the complicated structure of the multi-layer fluidized bed and the large layer bed resistance. The wet material is continuously added to the first chamber of the dryer by the feeder. Since the material is in a fluidized state, it can be freely moved from the previous chamber to the rear chamber. The dried material is discharged from the discharge port of the last drying chamber, and can dry various difficult-to-dry granular materials and heat-sensitive materials, and is gradually promoted to powdery materials.
This type of dryer is suitable for polyvinyl chloride resin, polypropylene resin, nylon 1010, o-chlorobenzoic acid, tetracycline, oxytetracycline, chloramphenicol, liver powder, powdered sugar, citric acid, oxalic acid, chlorinated rubber and other materials. dry.

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