As a cross-industry, interdisciplinary, and experimental scientific nature, drying technology has a wide range of applications in various fields. Faced with numerous industries, different physical and chemical properties of materials, product quality and other requirements vary widely, China's development of drying technology has a long way to go.
Although modern drying technology has a history of more than one hundred years, it still belongs to the category of experimental science. Drying technology has a wide range of applications. At present, there are more than 400 drying equipment manufacturers in China. The annual production value of drying equipment reaches 1.7 billion to 2 billion yuan. The products can not only meet the needs of the domestic market, but also have a small amount of exports. foreign. However, the overall level of drying technology and equipment in China is still at a middle to low level compared with countries with more developed drying technologies in the world.
At present, there are major deficiencies in domestic drying technologies: 1. There are widespread problems such as large heat loss, low thermal efficiency, high coal consumption, difficulty in controlling the discharge of water, and low relative output; 2. Use of waste heat gas with a temperature of less than 350°C as a heat source. Drying materials can not be adapted; 3. Can not adapt to the drying of crystal water containing materials, can not adapt to the high moisture materials drying; 4. The phenomena of the phenomenon of large particle size of the materials in the drying process can not be resolved, greatly affecting the material Drying effect; 5. Drying system does not use automatic computer detection and control system, can not accurately on-line materials, wind, coal, etc. for accurate online detection and control, resulting in the drying system can not play the best effect.
The role of automatic control in the dryer is well-known, but the current drying equipment industry is mainly engaged in the development of small businesses, new products, and perfect introduction of new products is mainly to imitate each other. Experts believe that it is not difficult to solve the control problem in the drying equipment with regard to the current level of automation, but the lack of a reasonable combination of automatic control technology and drying equipment. Therefore, the drying equipment industry needs to develop advanced technologies and improve product quality.
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