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    Home > Active Ingredient News > Drugs Articles > How to define hot air circulation oven in drying technology

    How to define hot air circulation oven in drying technology

    • Last Update: 2019-06-20
    • Source: Internet
    • Author: User
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    In the production and life of human beings, we often encounter the situation that we need to remove the moisture from a certain object The object can be solid, liquid or gas In most cases, the moisture content of the object is water, sometimes it is other components, such as inorganic acid, organic solvent, etc This process of removing moisture from an object is called dehumidification We divide dehumidification methods into several categories according to different working principles, and drying is one of them In general, people call the process of dehumidification by thermal physical hot air circulation oven as "drying" It is characterized by the use of heating, cooling, decompression or other means of energy transfer to make the moisture in the material produce volatilization, condensation, sublimation and other phase transformation process and object separation to achieve the purpose of dehumidification Dehumidification methods without this feature are usually not included in the scope of drying technology Some dehumidification methods, such as liquid concentration by heating, have the characteristics of thermophysical dehumidification, but people do not think that concentration belongs to drying technology However, with the development of the times, some new dehumidification technologies that do not belong to thermophysical method are gradually included in the scope of drying technology, such as molecular sieve, supercritical flow extraction, etc Therefore, the definition and category of drying technology is a conventional and expanding concept Traditional industrial hot air circulation oven The main drying equipment commonly used in production is: box drying, tunnel drying, rotary drying, rotary drum drying, belt drying, disc drying, paddle drying, fluidized bed drying, spouted bed drying, spray drying, airflow drying, vacuum freeze drying, solar drying, microwave and high-frequency drying, infrared radiation drying, and hot air drying oven drying method In addition, in various industries, such as grain, fruit and vegetables, wood, tea, dairy, Chinese herbal medicine and other industries, there are also proprietary drying technologies and equipment suitable for their own characteristics These traditional drying technologies have a long history of development, mature and reliable, and have been widely used in the world In recent years, a number of new drying technologies have emerged in the world The typical ones are: pulse combustion drying, impinging stream drying, impact penetrating drying, acoustic field drying, supercritical fluid drying, superheated steam drying, contact adsorption drying, etc Compared with traditional drying technology, these new technologies have some breakthroughs in mechanism, but still need to be improved in industrial application At present, these new drying technologies are still in the early stage of research in China.
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