It is understood that the belt dryer consists of several independent unit sections. Each unit segment includes a circulation fan, a heating device, a separate or common fresh air intake system and an exhaust gas discharge system. Dryer performance directly affects the quality and value of dried foods. In recent years, China has developed a variety of multi-functional, high-efficiency, low-energy, and adaptable dryers.
According to experts, the belt dryer has a simple structure, easy installation and long-term operation. In the event of a failure, it can also enter the tank for inspection and maintenance. Belt dryers have a wide range of applications, and they are currently used in pharmaceutical, food, biological, and chemical industries. However, the selection criteria in each field are not the same, because the requirements and parameters of dry materials in various fields are quite different.
Dryer companies in China should actively absorb advanced foreign technologies, innovate products, and improve product quality. Development of large-scale equipment, control of automation, quality, surface treatment equipment, selection of anti-corrosion materials, efforts to develop multi-functional combination machines, continue to extend the product life cycle.
(1) Single-stage belt dryer: The material to be dried is evenly distributed to the transfer belt from the feed end 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 belt dryer: The impact belt dryer is suitable for drying the surface coating of fabrics, tobacco leaves, substrates and other sheet 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 the fresh drying medium.
Belt dryers are used for the drying of sheets, strips, granules and partially pasty materials with good air permeability. Some of them can also be baked and matured. The belt dryer has a simple structure, easy installation and long-term operation. In the event of a failure, it can also enter the tank for inspection and maintenance.
How to choose a belt dryer?
The first step is to perform a small sample test on the dried material. This is very important. Therefore, whether or not the equipment supplier has material testing equipment and experienced samplers is the most direct way for customers to measure the true capabilities of manufacturers. Qualified belt dryer manufacturers generally can provide customers with a copy of the actual evaporation of materials, dynamic drying vacuum, drying temperature distribution, the amount of feed size, the actual drying time, in the shortest time after the material test. Actual product capacity, unit energy consumption ratio, and other technical parameter reports facilitate customers to select equipment models and specifications that can meet production requirements.
The second step is to comprehensively examine the manufacturer's design level and manufacturing capabilities. On the basis of the material test report, the manufacturer will generally provide a draft of the technical design plan according to the customer's production indicators and working conditions and make a detailed statement of the design reasons in the plan. The technical design scheme is a very important part of assessing the manufacturer's manufacturing capabilities in the vacuum belt dryer, especially the design description of the key technology of the manufacturer for the equipment, such as the design of the vacuum system, the design of the heating system, and the correction system. Design, design of cleaning system and design of feeding and discharging systems.
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