Model selection

　　The belt dryer has a wide range of applications, and now has its place in pharmaceutical, food, biological, chemical and other fields. However, the selection criteria are different in each field, because the requirements and parameters of drying materials in each field are quite different. For example, in the pharmaceutical industry (especially in traditional Chinese medicine), the viscosity of the extract is generally high, and the drying temperature requirements are strict, the melting point should be controlled (especially for polysaccharide materials), the control range of the vacuum degree should meet the requirements of different heating temperatures, and should have the function of automatic adjustment on the line. In addition, the detection system should be improved as far as possible to meet the pharmaceutical GMP standard. For the food industry, the solid content of the material extract is generally large (more than 65%). The requirements for output and the specific volume and appearance of the product are the key factors in the selection standard of the vacuum belt dryer. There are two factors in the selection process of the food-grade vacuum belt dryer that should not be ignored: one is the consumption ratio of unit energy consumption, the other is the supporting equipment, such as the pre-stage transportation of raw materials The dried products are finely crushed and packed. As for the vacuum belt dryers used in biological and chemical industries, due to the different forms of products, the selection criteria are extremely complex, so special care should be taken.

　　The first step in selecting a vacuum belt dryer is to carry out a small sample test on the dried materials, which is very important. Therefore, whether the equipment supplier has material test equipment and experienced test personnel is a direct way for customers to measure the manufacturer's real ability. Qualified vacuum belt dryer manufacturers can generally provide customers with a report of technical parameters including the actual evaporation of materials, dynamic drying vacuum, drying temperature distribution, feeding amount, actual drying time, actual product capacity, unit energy consumption ratio and other technical parameters in a short time after the material test, so as to facilitate customers to select equipment models and specifications that can meet production requirements.

　　The second step in selecting the vacuum belt dryer is to comprehensively investigate the design level and manufacturing capacity of the manufacturer. The manufacturer will generally provide a first draft of the technical design scheme based on the material test report according to the customer's production indicators and working conditions, and make a detailed statement of the design reasons in the scheme. The technical design scheme is an extremely important part of evaluating the manufacturer's manufacturing capacity of vacuum belt dryer, especially the manufacturer's design description of the key technology of the equipment, such as the design of vacuum system, heating system, deviation correction system, cleaning system, and feeding and discharging system. Another aspect of manufacturing capability is to investigate the actual use of manufacturers and users. According to the list of users provided by the manufacturer, the customer can request to visit the site. If the manufacturer does have sufficient strength, it will not refuse the reasonable request of the customer, and some can even provide multiple visiting targets for the customer to choose. However, it is generally difficult for enterprises with limited manufacturing capacity or low technical level to do this.

　　The third step in selecting the vacuum belt dryer is to investigate the actual processing capacity and production scale of the manufacturer. At present, there are no more than three domestic enterprises with serialized design and production capacity, especially only 1-2 manufacturers with annual output of more than 10 vacuum belt dryers (especially large or ultra-large equipment with more than 6 drying beds). Therefore, it is difficult for most domestic manufacturers to form standardized processing of parts of vacuum belt dryer. There are large problems in the maintenance and service of products provided to customers and the exchange of parts and accessories, which often directly affect the production efficiency of users. In addition, due to the lack of practical experience, it is impossible to consider the mechanical structure of equipment, the rationality of configuration, the accuracy requirements of manufacturing, and so on. However, the vacuum belt dryer is characterized by large volume, many auxiliary equipment, high configuration requirements and complex intermediate links, so it is not easy to maintain the long-term stability of the equipment operation. The price of this kind of equipment is also relatively expensive. Users generally use huge amounts of money to purchase it because of its drying capacity and technical advantages, so they hope to recover the cost as soon as possible and improve the economic benefits of the enterprise. Therefore, when purchasing equipment, we must choose manufacturers with scale, practical design and manufacturing experience and reliable after-sales service assurance system to rest assured. Of course, the price of vacuum belt dryer provided by such manufacturers is generally a little higher, but for users, there is a sense of security in use. Customers should not be affected by the low price for a while.

Scope of application

　　It is suitable for drying of sheet, strip and granular materials with good permeability, especially for materials with high moisture content, such as dehydrated vegetables and Chinese herbal decoction pieces, and the material temperature is not allowed to be high; This series of dryers has the advantages of fast drying speed, high evaporation intensity and good product quality. The paste material of dehydrated filter cake can also be dried after granulation or rod-shaped.