The development of drying equipment in China and the selection of drying equipment

China Drying Network The low level of automation of domestically produced drying equipment and the backwardness of control methods are common problems. As far as the current level of automation is concerned, it is not difficult to solve the control problem in the drying equipment, but what is lacking most is the problem of the reasonable combination of the automatic control technology and the drying equipment. Different materials require different dryers. Similarly, there are major differences in the requirements for control methods for different materials. The role of automatic control in the dryer is well-known, but its one-time investment is also the issue that people are most concerned about. Sometimes the investment in control equipment even exceeds the investment in the mechanical part of the dryer. It is also the subject that research should be carried out to determine a reasonable control plan for dryers and drying process requirements and to determine appropriate control measures for specific drying projects.
In addition, we should also pay attention to the scaling up of drying equipment. The enlargement involves disciplines such as fluid mechanics, mechanics, thermodynamics, heat transfer, materials science, dust removal, corrosion protection, electrical appliances, and control. It is very likely that some problems will arise during the amplification process. Therefore, the amplification of the drying device is by no means a simple geometrical enlargement. In this respect, it largely depends on the experience of industrialization, the mastery of the physical properties of materials and the understanding of drying equipment. The phenomena that may occur during the enlargement process should be predicted rationally and objectively, and corresponding solutions can be proposed. The so-called research amplification effect is to grasp the drying theory and drying technology while paying attention to accumulating practical experience, summing up the amplification law of the equipment and accumulating experience for engineering design.
With the rapid development of China's economy, drying equipment manufacturers are booming, and drying equipment has gradually occupied a certain position in the Chinese market. According to statistics, there are currently more than 500 domestic drying equipment manufacturers, and the annual market demand exceeds RMB 3 billion. However, most dry equipment manufacturers have low technical level, and some do not even have the technology to speak of. A group of “stuffed brands” with low investment and low technology content squeezed the market with a large number of low-quality, low-cost equipment, which not only affected the overall image of the drying equipment, but also caused “negligence” in domestic drying equipment prices, thus making China dry. The overall competitiveness of the industry can hardly be played.
Contrary to the status quo of the drying equipment industry, at present, there are dozens of universities and research institutes in China that are engaged in the development and research of drying technology, but most of the scientific research results have not been translated into actual productivity. Therefore, experts believe that increasingly fierce competition requires that the drying equipment industry must actively cooperate with scientific research institutes to increase the added value of products through technological advancement and independent innovation. Experts also believe that drying equipment manufacturers can target one or several industries according to their own advantages, conduct in-depth research on material properties, establish authority in small industries, and occupy the market.
Each type of drying device has its own specific application range, and each kind of material can find several kinds of drying devices that can meet the basic requirements, but the most suitable one can only be one type. If improperly selected, users must not only bear unnecessary one-time high procurement costs, but also pay a heavy price during the entire use period, such as low efficiency, high energy consumption, high operating costs, poor product quality, and even the fundamental Not working properly and so on.
The following is the general principle of drying equipment selection. It is difficult to say which one or several items are the most important ones. The ideal selection must be focused according to one's own conditions, and sometimes the trade-off is necessary.
1. Applicability ------- The drying device must first be able to apply to specific materials and meet the basic requirements for material drying, including the ability to handle the material well (feeding, conveying, fluidization, dispersion, transfer Heat, discharge, etc., and can meet the basic requirements of the amount of processing, dehydration, product quality and so on.
2. High drying rate—Only considering the drying rate, the convection drying material is highly dispersed in the hot air, the critical moisture content is low, the drying speed is fast, and the same is the convection drying, and the drying method has different critical moisture content. The drying rate is also different.
3. Low energy consumption ------- Different drying methods have different energy consumption indicators. In general, the thermal efficiency of conduction drying can theoretically reach 100%, and convection drying can only be about 70%.
4. Save investment ----- Complete the same function of the drying device, sometimes its cost difference is very different, you should choose the lower one.
5. Low operating costs - equipment depreciation, energy consumption, labor costs, maintenance costs, spare parts costs ... and other operating costs should be as low as possible.
6. Priority should be given to selecting desiccators with simple structure, adequate supply of spare parts, high reliability, and long life.
7. Meet environmental requirements, working conditions, and high safety.
8. Before the selection, it is best to make a drying experiment for the materials, and to have an in-depth understanding of the drying devices (advantages and disadvantages) that have been used for similar materials, which are often helpful for proper selection.
9. Not relying entirely on past experience, focusing on absorbing new technologies and listening to the opinions of experts.

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