Application scope and selection of belt dryer

Selection
The belt dryer has a wide range of applications. At present, it has its place in the fields of pharmaceuticals, food, biology, chemical industry and so on. However, the selection criteria in each field are not the same, because the requirements and parameters of the dry materials in each field are quite different. For example: in the pharmaceutical industry (especially traditional Chinese medicine), extracts generally have higher viscosity and stricter drying temperature requirements. The melting point must be accurately controlled (especially for polysaccharide materials). The vacuum control range must be different. The heating temperature of the segment needs to be equipped with online automatic adjustment function and so on. In addition, the testing system should be improved as far as possible to meet the pharmaceutical GMP standards. For the food industry, the solid content of the material extract is generally relatively large (more than 65%). The output requirements and the specific volume and appearance of the product are the keys in the selection criteria of the vacuum belt dryer. Food grade vacuum belt There are two elements that must not be ignored in the selection process of the dryer: one is the consumption ratio of unit energy consumption, and the other is the supporting equipment such as the front-stage conveying of raw materials, the fine crushing of the dried product and the packaging. As for the vacuum belt dryers used in biology and chemical industry, due to the different forms of products, the selection criteria are extremely complex, so extra caution is required.

The first step in choosing a vacuum belt dryer is that it is important to conduct a small sample test of the dried material. Therefore, for equipment suppliers, whether they have material testing equipment and experienced sample personnel is a direct way for customers to measure the true capabilities of manufacturers. Qualified manufacturers of vacuum belt dryers are generally able to provide customers with a copy in a short time after the material test includes: material actual evaporation, dynamic drying vacuum, drying temperature distribution, feed volume size, actual drying Technical parameter reports such as time, actual product capacity, unit energy consumption ratio, etc., are convenient for customers to choose equipment models and specifications that can meet production requirements.

The second step in choosing a vacuum belt dryer is to comprehensively investigate the design level and manufacturing capabilities of the manufacturer. Manufacturers generally provide a preliminary draft of the technical design plan based on the material test report and the customer's production indicators and working conditions, and make a detailed statement of the design reasons in the plan. The technical design plan is an extremely important part of evaluating the manufacturer's ability to manufacture vacuum belt dryers, especially the manufacturer's description of the key technology of the equipment such as: vacuum system design, heating system design, deviation correction system Design, design of cleaning system, design of feeding and discharging system, etc. Another aspect of manufacturing capabilities is to examine the actual usage of manufacturers' users. Customers can request a site visit based on the user list provided by the manufacturer. If the manufacturer does have sufficient strength, it will not refuse this reasonable request from the customer, and some may even provide multiple visit targets for customers to choose. It is generally difficult for companies with limited manufacturing capacity or low technical level to do this.

The third step in choosing a vacuum belt dryer is to examine the actual processing capacity and production scale of the manufacturer. At present, there will be no more than three domestic enterprises with serial design and production capacity, especially the manufacturers with an annual output of more than 10 vacuum belt dryers (especially large or super large equipment with more than 6 layers of drying beds) are estimated to be the only ones. 1 to 2. Therefore, it is difficult for most domestic manufacturers to form standardized processing of the components of the vacuum belt dryer. The product maintenance and maintenance provided to customers and the exchange of components and accessories have major problems, which often directly affect the users. In addition, due to the lack of practical experience, the mechanical structure of the equipment, the rationality of the configuration, the accuracy requirements in manufacturing, etc. can not be considered very thoroughly. However, due to the characteristics of large volume, many auxiliary equipment, high configuration requirements, and complicated intermediate links, it is not easy to maintain the operating state of the equipment for a long time. 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 to improve the economic benefits of the enterprise. Therefore, when purchasing equipment, you must choose a manufacturer who has scale, practical design and manufacturing experience, and a reliable after-sales service guarantee system. Of course, the price of vacuum belt dryers provided by such manufacturers is slightly higher, but For the user, there is a sense of security in use, and the customer must not affect the overall situation because of the cheap price.

Application range
It is suitable for drying sheets, strips and granules with good air permeability. It is especially suitable for materials with high moisture content, such as dehydrated vegetables and Chinese herbal medicines, and the temperature of the material is not allowed to be high; this series of dryers have fast drying speed, The advantages of high evaporation intensity and good product quality. For the paste-like material of the dehydrated filter cake, it can be dried after being granulated or made into a rod shape.