Belt dryer is a continuous drying equipment for batch production. It is used to dry sheets, strips, and granular materials with good air permeability. For dehydrated vegetables, catalysts, and Chinese herbal medicines, etc., the moisture content is high, and the materials It is particularly suitable for materials whose temperature is not allowed to be high; this series of dryers have the advantages of fast drying speed, high evaporation strength and good product quality. For paste-like materials of dehydrated cakes, they must be granulated or made into strips to be dried.
(1) Single-stage belt dryer: The material to be dried is evenly distributed from the feed end to the transfer belt via the charging device. Conveyor belts are usually made of perforated stainless steel sheet, driven by a motor via a gearbox, which can be speed-controlled. The drying cabinet body is usually divided into several units so as to independently control the operating parameters and optimize the operation. There is an isolation section between the drying sections where there is no drying medium circulation.
(2) Multi-stage belt dryer: The 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 a single-stage belt dryer.
(3) Multi-layer belt dryer: The multi-layer belt dryer is often used in applications where the drying speed is low, the drying time is long, and the process operating conditions can be kept constant throughout the drying process. The spacers are arranged between the layers to direct the directional flow of the drying medium to make the materials dry and uniform. The multi-layer belt dryer occupies a small area, has a simple structure and is widely used for drying cereal materials. However, due to multiple loading and unloading during operation, it is not suitable for dry-easy-adhesion conveyor belts and materials that are not allowed to crack.
(4) Impact type belt dryer: The impact type belt dryer is suitable for drying the surface coating of fabrics, tobacco leaves, substrates and other sheet-like materials. Impact belts usually consist of two conveyor belts. The impact belt machine can be divided into unit sections for independent control. After the drying medium is humidified, it is partially discharged, and the other part is recycled after being mixed with fresh dry media.