Application range and selection of belt dryer
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The belt dryer has a wide range of applications. At present, it has its application in the pharmaceutical, food, biological, chemical and other fields. However, the selection criteria are different in each field, because the requirements and parameters of dry materials in various fields are quite different. For example: in the pharmaceutical industry (especially Chinese medicines), extracts generally have higher viscosity and stricter drying temperature requirements. The melting point must be controlled accurately (especially for polysaccharides). The control range of vacuum must be different. The heating temperature of the segment is required and it must have the function of online automatic adjustment and so on. In addition, the detection system should be as complete as possible to comply with 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 key in the selection criteria of the vacuum belt dryer. The food-grade vacuum belt There are two factors 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 pre-conveying of raw materials, the fine crushing of the dried product, and packaging. As for the vacuum belt dryers used in biology and chemical industry, because of the different forms of products, the selection criteria are extremely complicated, so extra care must be taken.
The first step in selecting a vacuum belt dryer is to perform a small sample test on the dried material, which is very important. 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. A qualified vacuum belt dryer manufacturer can generally provide customers with a copy of the material in a short period of time after the material test, including: the actual evaporation of the material, the dynamic drying vacuum, the distribution of the drying temperature, the size of the input, the actual drying Technical parameter reports such as time, actual product capacity, and unit energy consumption ratio are convenient for customers to choose the equipment model and specifications that can meet the production requirements.
The second step in selecting a vacuum belt dryer is to comprehensively examine 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 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 an extremely important part of assessing the manufacturer's ability to manufacture the vacuum belt dryer, especially the manufacturer's design description of the key technologies of 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 system. Another aspect of manufacturing capability is to examine the actual usage of the manufacturer's users. Customers can request site inspections according to the user list provided by the manufacturer. If the manufacturer does have sufficient strength, it will generally not reject the customer's reasonable request, and some can even provide multiple visit targets for customers to choose from. It is generally difficult for companies with limited manufacturing capabilities or low technical skills to do this.
The third step in selecting a vacuum belt dryer is to examine the actual processing capacity and production scale of the manufacturer. At present, there are no more than three domestic companies with a series of design and production capabilities, especially those manufacturers with an annual output of more than 10 vacuum belt dryers (especially large or ultra-large equipment with more than 6-layer drying beds). 1-2. Therefore, it is very 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 parts and accessories have major problems, which often directly affect users. In addition, due to the lack of practical experience, the mechanical structure of the equipment, the rationality of the configuration, and the accuracy requirements of the manufacturing cannot be considered thoroughly. The vacuum belt dryer is not easy because of its large size, many auxiliary equipment, high configuration requirements, and complicated intermediate links. The price of this kind of equipment is also relatively expensive. Users are generally optimistic about its drying capacity and technical advantages and have spent huge amounts of money to purchase, 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 with scale, actual design and manufacturing experience, and a reliable after-sales service guarantee system. Of course, the vacuum belt dryer provided by such a manufacturer generally has a slightly higher price, but For users, there is a sense of security in use, and customers must not affect the overall situation because of the low price.
It is used for drying sheet, strip and granular materials with good air permeability. It is especially suitable for materials with high moisture content such as dehydrated vegetables and decoction pieces of Chinese medicine 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. The paste-like material of the dehydrated filter cake can be dried after being granulated or made into a stick.