Supply belt dryer

Product Introduction of DW Belt Drying Machine

It is a continuous flow drying equipment used for drying sheet, strip, and granular materials with good breathability. It is particularly suitable for dehydrated vegetables, traditional Chinese medicine decoction pieces, and other materials with high moisture content and high material temperature; This series of dryers has the advantages of fast drying speed, high evaporation intensity, and good product quality. For dehydrated filter cake like paste materials, they can also be dried after granulation or shaping into strips.

1、 Working principle

The materials are evenly spread on the mesh belt by the feeder, and the mesh belt is made of 12-60 mesh stainless steel wire mesh. Dragged by the transmission device to move inside the dryer. The dryer consists of several units, each with independent hot air circulation. Some of the exhaust gas is discharged by a specialized dehumidification fan, and the exhaust gas is controlled by a regulating valve. The hot air passes through the materials laid on the mesh belt from bottom to top or from top to bottom, heating and drying while removing moisture. The mesh belt moves slowly, and the running speed can be freely adjusted according to the material temperature. The dried finished product continuously falls into the feeder. The upper and lower loop units can be flexibly equipped according to user needs, and the number of units can be selected as needed.

The materials in the hopper are evenly spread on the mesh belt by the feeder. The mesh belt is generally made of 12-60 mesh stainless steel wire mesh and is dragged by the transmission device to move inside the dryer. The dryer consists of several units, with each unit having independent hot air circulation. Some of the exhaust gas is discharged by a dedicated dehumidification fan 4, and the amount of exhaust gas emitted by each unit is controlled by a regulating valve. In the upper circulation unit, the air from the circulating fan 5 enters the lower chamber of the unit through the side air duct. The airflow is heated by the heater 7 and distributed by the distributor 6, forming a jet flow that blows towards the mesh belt, passes through the material, and enters the upper chamber. The drying process is the process of hot air passing through the material layer, completing the transfer of heat and mass. The upper chamber is connected to the inlet of the fan through an air duct. Most of the gas is circulated, and a portion of the gas with lower temperature and higher moisture content is discharged as exhaust gas through the dehumidification pipe, regulating valve, and dehumidification fan. In the lower circulation unit, the air from the circulating fan enters the upper chamber, is heated by the heat exchanger, passes through the material layer, and enters the lower chamber. The lower chamber is connected to the fan through side air ducts and return air ducts, with most of the gas circulating and some being discharged. The upper and lower loop units can be flexibly equipped according to user needs, and the number of units can also be selected as needed.

Used for dehydrating vegetables, generally three devices are connected in series to form the initial drying section, middle section, and final drying section. In the initial drying stage, due to the high moisture content of the material. Due to poor breathability, a smaller paving thickness, faster operating speed, and higher drying temperature are used. In the initial drying stage, the temperature of the drying gas can reach over 120oC. The retention time of materials in the final drying stage is 3-6 times that of the initial drying stage, and the paving thickness is 2-4 times that of the initial drying stage. For the requirement of material temperature not exceeding 60oC, dry gas at around 80oC can be used. Using a multi-stage combination can better utilize the performance of the belt dryer and achieve more uniform drying.

2、 Structural form

(1) Single level: The dried material is evenly distributed onto the conveyor belt through the feeding device at the feeding end. Conveyor belts are usually made of perforated stainless steel sheets, driven by motors through gearboxes, and can be adjusted in speed. The interior of the drying machine is usually divided into several units for independent control of operating parameters and optimization of operations. There is an isolation section between the drying sections, where there is no circulation of drying medium.

(2) Multi level: Multi level belt drying is essentially composed of several single-stage belt dryers connected in series, and its operating principle is the same as that of single-stage belt dryers.

(3) Multilayer: Multilayer belt dryers are commonly used in situations where the drying speed is low, the drying time is long, and the process operating conditions can be maintained constant throughout the entire drying process. Set up partitions between layers to organize the directional flow of drying medium, ensuring uniform drying of materials. Multi layer belt dryer takes up less space, has a simple structure, and is widely used for drying grain materials. However, due to the need for multiple loading and unloading during operation, it is not suitable for dry and easily adhesive conveyor belts and materials that are not allowed to break.

(4) Impact belt dryer: The impact belt dryer is suitable for drying surface coatings of fabrics, tobacco leaves, substrates, and other thin sheet materials. The impact belt conveyor usually consists of two conveyor belts. The impact belt conveyor can be divided into unit segments for independent control. After the drying medium is humidified, some of it is discharged, while the other part is returned and mixed with fresh drying medium before circulating.

Application scope of DW belt dryer

Dehydrated vegetables, pellet feed, monosodium glutamate, coconut milk, organic pigments, synthetic rubber, propylene fiber, pharmaceuticals, medicinal herbs, small wooden products, electronic components aging, solidification, etc.

Product Features

The materials are evenly spread on the welded mesh belt by an automatic batching machine. The mesh belt is generally made of 12-60 mesh stainless steel wire mesh and is dragged by a transmission device to move inside the dryer. The dryer consists of several units, each with independent hot air circulation. Some of the exhaust gas is discharged by a specialized dehumidification fan, and the exhaust gas is controlled by a regulating valve. The hot air passes through the mesh belt covered with materials from bottom to top or from top to bottom to complete the process of heat and mass transfer, taking away the moisture of the materials. The mesh belt moves slowly, and the running speed can be freely adjusted according to the material temperature. The dried finished product continuously falls into the feeder. The upper and lower loop units can be flexibly equipped according to user needs, and the number of units can also be selected as needed.

Technical Specifications