Application of Microwave Dryer in Tobacco Drying
Microwave is a form of energy that can be converted to heat in a dielectric. The material that can absorb microwave energy is placed in a high-frequency alternating electric field, and the particles in the material undergo repeated reversal movement, which causes the collision to be intensified, resulting in heat dissipation (or Joule heat), and energy conversion occurs.
Therefore, the microwave drying machine is a kind of dielectric drying. During the dielectric drying process, heat is generated inside the material, and the mass transfer driving force is mainly a vapor pressure gradient rapidly generated inside the material.
Compared with ordinary drying heated by hot air and steam, the main advantage of microwave drying is that the energy is effectively utilized and the material is not destructive (drying at a lower ambient temperature, no high surface temperature is required), The loss of other volatile substances is small and the effect is uniform (can form a more uniform humidity field and humidity distribution), and the drying is rapid (the drying time can be shortened by 50 or more), which is beneficial to improve the quality of the spinning (such as avoiding the surface hardening of the tobacco). . Since the installation of the first microwave dryer in our factory, the actual application effect has been tracked and tested. The results show that the use of microwave drying has a certain effect on the expansion of tobacco.
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