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Microwave drying of microwave dryer is a new type of drying method
.
When drying, microwave can directly act on the medium molecules converted into thermal energy, because the microwave has the penetrating performance to make the medium inside and outside heating at the same time, no heat conduction is required, so the heating speed is very fast, for the water content of food below 30%, the drying speed can be shortened by hundreds of times
.
At the same time, regardless of the shape of the object, due to the simultaneous heating of the object's medium inside and outside, the temperature difference between the inside and outside of the material is small, the heating is uniform, and the external coke endogenous condition will not occur in conventional heating, which greatly improves
the drying quality.
Microwave drying is different from traditional drying methods, and its heat conduction direction is the same as
that of moisture diffusion.
Compared with the traditional drying method, it has the advantages of large drying rate, energy saving, high production efficiency, uniform drying, clean production, easy to achieve automatic control and improve product quality, so the various fields of dryness are paying more and more attention
.
As early as the 1960s, a lot of research has been carried out on the application and theory of microwave drying technology abroad, and it has been further developed
in recent decades.
China's microwave drying technology research started late, compared with foreign countries there is a certain gap, but also achieved good results, there are many research and application results
.
China's microwave drying technology has been used in food industry, material chemical industry, pharmaceutical industry, mineral mining industry, ceramic industry, laboratory analysis, wet natural rubber processing and other aspects
.
The drying process involves almost all sectors of the national economy and is widely used in production and life
.
The purpose of drying is to remove moisture or solvents from certain raw materials, semi-finished products and finished products for processing, use, transportation and storage
.
General drying methods are mechanical, chemical and heating (freezing).
These methods are either large equipment and high drying costs, or slow drying speed and low
processing capacity.
With the development of science and technology, such as biological products, new materials (multiphase composites, nanomaterials, intelligent materials and biomedical materials, etc.
), advanced ceramics, new advanced foods and new pharmaceutical products and other new products, traditional drying technology and dryers are not necessarily adaptable
.
Microwave drying technology and microwave dryer have been widely used in light industry, chemical materials industry, food and agricultural products processing industry and other industries and show significant advantages
.
Microwave drying is undoubtedly a new technology adapted to the requirements of new products
.