As with other industrial technologies, drying technology has also made great strides in the application process. At present, there are more than 400 types of dryers, and about 200 dryers have been used in industrial production. Many new dryers have appeared, some of which have structural improvements to ordinary dryers. The reference draws on the advantages of other dryers, and some are completely new ideas. Drying is a unit operation with considerable industrial energy consumption. According to the data, 14% of the industrial energy consumption in developed countries is used for drying. In some industries, the dry energy consumption accounts for 35% of the total energy consumption, and this figure It is constantly increasing. At the same time, the use of fossil fuels as a heat source for drying operations produces a large amount of gas such as carbon dioxide. The exhaust of drying equipment (which contains some dust in the gas) has a negative impact on the atmospheric environment, which is a great challenge for the “environmental protection†that is increasingly attracting global attention.
Almost all industries are inseparable from drying operations. Although it is helpful to understand the working mechanism of drying and drying equipment to successfully complete the drying process, we still need to continuously invest human and material resources to further study the drying technology. Developed to enable efficient use of energy while reducing high-quality products, reducing environmental impacts, and making process operations and controls easier.
Drying technology has a wide range of applications. In the face of numerous industries, physical and chemical properties, materials, product quality and other diverse requirements, drying technology is a cross-industry, interdisciplinary, experimental and scientific technology. Generally, three aspects of knowledge and technology are required in the development and application of drying technology. The first is to understand the physical and chemical properties of the material being dried and the characteristics of the product; the second is to be familiar with the principle of transfer engineering, namely the principle of mass transfer, heat transfer, fluid mechanics and aerodynamics; The means of implementation is the ability to carry out engineering design for drying processes, main equipment, and electrical instrument control. Obviously, these three aspects of knowledge and technology do not belong to a subject area. In practice, these three aspects of knowledge and technology are indispensable. So drying technology is a cross-industry, interdisciplinary technology. Although modern drying technology has a history of more than one hundred years, it still belongs to the category of experimental science. Most drying technologies currently lack scientific theories and design methods that accurately guide practice.
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