(1) Single-stage belt dryer: The material to be dried is evenly distributed on the conveyor belt from the feeding end through the feeding device. The conveyor belt is usually made of perforated stainless steel sheet, driven by a motor through a gearbox, and can be adjusted in speed. The drying cabinet is usually divided into several units in order to independently control the operating parameters and optimize the operation. There is an isolation section between the drying sections, where there is no circulation of the drying medium.
(2) Multi-stage belt dryer: Multi-stage belt dryer is essentially composed of several single-stage belt dryers in series, and its operating principle is the same as that of single-stage belt dryers.
(3) Multi-layer belt dryer: Multi-layer belt dryer is often used in occasions where the drying speed is relatively low, the drying time is long, and the process operating conditions can be kept constant during the entire drying process. A partition is set between the layers to organize the directional flow of the drying medium and make the material dry evenly. The multi-layer belt dryer occupies a small area and has a simple structure. It is widely used for drying grain materials. However, due to multiple loading and unloading during the operation, it is not suitable for drying materials that are easy to stick to the conveyor belt and are not allowed to be broken.
(4) Impact belt dryer: The impact belt dryer is suitable for drying the surface coatings of fabrics, tobacco leaves, substrates and other flake-like materials. The impact belt machine usually consists of two conveyor belts. The impact belt machine can be divided into unit sections for independent control. After the drying medium is humidified, part of it is discharged, and the other part is returned to be mixed with fresh drying medium and then recycled.