summary
The DW series belt dryer is a commonly used continuous drying equipment, which can be widely used in industries such as chemical, food, medicine, building materials, electronics, etc. It is suitable for drying sheet, strip, and granular materials with good breathability. It is especially suitable for materials with high moisture content and high material temperature, such as dehydrated vegetables and traditional Chinese medicine slices. The DW series belt dryer has the advantages of fast drying speed, high evaporation intensity, and good product quality. For paste like materials such as dehydrated filter cakes, they can also be dried after being formed by granulators or extrusion mechanisms.

Principle and characteristics
The materials in the hopper of the DW series belt dryer are evenly laid on the mesh belt by the feeder. The mesh belt is made of 12-60 mesh stainless steel wire mesh, which is dragged by the transmission device to move inside the dryer. The drying section consists of several units, each with independent circulation of hot air. Some of the exhaust gas is discharged by a dedicated dehumidification fan, and the amount of air discharged from each unit is controlled by a regulating valve. In the upper circulating unit, the air from the circulating fan enters the lower chamber of the unit through the side air duct, and the airflow is heated up through the heat exchanger and distributed by the distributor. The jet stream blows towards the mesh belt, passes through the material, and enters the upper chamber. The drying process is a process where hot air flows through the material layer, completing the transfer of heat and quality. The upper chamber is connected to the inlet of the fan by an air duct, with most of the gas fluid circulating. A portion of the gas with lower temperature and higher humidity content is discharged as waste gas through the dehumidification pipe, regulating valve, and dehumidification fan. In the lower circulation unit, the air from the circulating fan first enters the upper chamber, is heated downwards by the heat exchanger, passes through the material layer, and enters the lower chamber. The lower chamber is connected to the fan inlet by side air ducts and return air ducts, with most of the gas circulating and some discharged. The upper and lower loop units can be flexibly equipped according to user needs, and the number of units can also be selected according to needs.
The DW series belt dryer, if used for dehydrating vegetables, generally uses three devices in series to form an initial drying section, an intermediate section, and a final drying section. In the initial drying stage, due to the high moisture content and poor breathability of the material, a small laying thickness, faster operating speed, and higher drying temperature are adopted. For materials with a temperature not exceeding 60 ℃, the temperature of the dry gas in the initial drying stage can be controlled below 120 ℃; The retention time of materials in the final drying section is 3-6 times that of the initial drying section, and the thickness of the paving material is 2-4 times that of the initial drying section. For the requirement of material temperature not exceeding 60 ℃, a dry gas of around 80 ℃ can be used. Adopting a multi-stage combination can better utilize the performance of the DW series belt dryer and achieve more uniform drying.

Typical products
Products that can be dried using the DW series belt dryer include dehydrated vegetables, pellet feed, monosodium glutamate, chicken essence, coconut, organic pigments, synthetic rubber, acrylic fiber, pharmaceuticals, medicinal materials, small wood products, plastic products, aging and solidification of electronic components, etc.

Main technical parameters

Process flow diagram