More than 400 types of dryers are described in the literature, of which more than 100 are commonly used. Because of the high latent heat of vaporization and the inefficiencies inherent in the use of hot air as a drying medium (common), drying becomes a unit operation that is energy intensive compared to distillation. Research shows that in the United States, Canada, France, and the United Kingdom, industrial drying energy consumption accounts for 10% to 15% of the country's total energy consumption, while in Denmark and Germany it is as high as 20% to 25%. (The latter data comes from mandatory energy audits in the industry and is therefore more reliable). Such high energy consumption is the result of widespread application of drying operations in various sectors of the national economy. The energy required for the drying process usually comes from the burning of fossil fuels, which will cause harm to the environment. As the global economy prospers, the energy consumption required for drying will increase accordingly, and the contradiction between drying and the environment will become more and more obvious. Therefore, in the context of ensuring market economy constraints, efforts must be made to improve the drying process and to minimize drying energy consumption.
Drying technology innovation means that at least one point of its properties can replace the original product, operation or method: products or methods that have not been manufactured or invented before; have higher productivity than the prior art; better quality or better quality control Feasible, better effect; reduce the environmental space occupied by equipment; operate safer; higher efficiency; lower total cost. The new technology can be to create a brand new product type, such as: microwave drying, dielectric drying and so on. It can also be a moderate improvement of existing products and processes, such as: jet impingement drying, cyclone drying, etc.; then significant improvements to existing technologies, such as: organic superheated steam drying, desiccant drying, etc.
The desiccant is dried, that is, contact-adsorbed and dried, and the drying principle is based on the moisture transfer between the dried material and the solid capable of adsorbing moisture in direct contact. This dry form contains two drying techniques. One is typical contact drying: where the evaporation of moisture is at the expense of the heat transferred from the hot solid surface. The second is sorption drying: where the transfer of moisture is driven by a mass concentration gradient. Due to the different interaction between the material and the adsorbent, the contact adsorption drying can be divided into two categories: inert adsorbent drying and active adsorption drying. The inert adsorbent is a solid material that does not constitute the final product of zui and is separated after completion of the drying process. The active adsorbent can be an integral part of the final product and does not have to be separated after the drying process is completed. Due to the addition of desiccant, the desiccant drying technology has better product quality, uniform quality and easy to maintain biological activity compared with conventional convection drying; short drying time; low operating cost, simple system, relatively small equipment, and low capital investment. Etc. It is especially suitable for users who need small, mobile or relatively insufficient power. It is a promising drying technology that can be widely used in chemical, food, pharmaceutical, textile, biological and other industries.
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