What is the working principle of an airflow dryer

The working principle of an airflow dryer is mainly based on the mixing and separation process of high-speed hot air flow and wet materials. Here is a detailed explanation:

Overview of Working Principle

The airflow dryer uses high-speed hot air flow to transport wet materials into the drying equipment through a conveyor. Inside the equipment, the fan breaks down wet and even potentially clumped materials, and simultaneously stirs and mixes them during the dispersion process. The material and hot air flow in parallel, and through a series of actions, the moisture in the material is finally separated to obtain a dry product.

Specific workflow

• Wet material addition: The dehydrated wet material is added to the airflow dryer through the feed inlet.
• Hot air flow mixing: The wet material added and the heated natural air (or hot air) enter the drying equipment simultaneously.
• Material dispersion and mixing: Under the action of the fan, wet materials are broken down and evenly dispersed in the pipeline. At the same time, the material comes into full contact with hot air under the action of the inclined plate, accelerating the drying heat and mass transfer process.
• Spiral motion and drying: High temperature airflow carries materials from the tangential direction into the interior of the equipment, forming a spiral motion along the inner wall. The material is evenly distributed and rotated in the airflow for drying.
• Moisture separation: During the drying process, the moisture in the material is gradually evaporated and separated from the material through a separator.
• Finished product discharge: The dried material flows out of the shaker (or similar device) and becomes the final product.

main features

• High drying intensity: Due to the highly dispersed nature of the material in the airflow, the entire surface of the particles actively serves as the effective drying area, resulting in high drying efficiency.
• Short drying time: The contact time between the material and air is extremely short, usually completing the drying process within 0.5-5 seconds, suitable for heat sensitive or low melting point materials.
• High thermal efficiency: The airflow dryer adopts the operation of material and gas co flow, and the material temperature and air temperature from the beginning to the end can reach a reasonable state, so the thermal efficiency is very high.
• Wide applicability: Airflow dryers are widely used in industries such as food, feed, chemical, pharmaceutical, and mining, and are suitable for drying various granular, sheet-like, or fibrous materials.
• Simple structure: The airflow dryer has a relatively simple structure, occupies a small area, and is easy to build and maintain.

In summary, the airflow dryer achieves rapid and efficient drying of materials through the mixing and separation process of high-speed hot air flow and wet materials.