The drying process requires large amounts of energy, in order to save energy, certain high moisture content of the material, or a solution containing suspended solids is generally first by mechanical dewatering or heating evaporation and then dried in a dryer to obtain dry solids. During the drying process it needs to complete the heat and mass transfer, ensure the material surface moisture vapor partial pressure is higher than the external space moisture vapor partial pressure, to ensure that the temperature is higher than the temperature of the material source.

Heat from the heat source in a variety of ways passed to the wet material, the material surface moisture vaporize and escape into outer space. So that the difference between the moisture content of the material appear in the surface and interior. Internal moisture diffusion and vaporization to the surface, so that the material moisture content decreasing gradually complete drying of the material as a whole.

The drying rate depends on the material surface diffusion rate and the internal rate of vaporization of moisture. The drying rate is usually dried by early vaporization rate control surface; then, as long as external conditions remain unchanged drying, drying rate and surface temperatures of materials that maintain a steady, constant drying phase at this stage is called; when the moisture content of the material is reduced to a degree, reduce internal moisture diffusion rate to the surface, and the surface is less than the vaporization rate, drying rate that is mainly determined by the internal diffusion rate, and with lower moisture content and continue to reduce, at this stage called the falling rate drying stage.

In addition, technological advances will reverse the current export situation of domestic drying equipment. China drying equipment yet to 5% export volumes, export volume is less than the total of the formation, and are mainly exported to Southeast Asia. However, according to authoritative forecasts, as technology evolves, the next few years China's total exports accounted for drying equipment will increase from 5% up to 10%, the export market will also be expanding in Southeast Asia to Europe. The presence of large domestic drying equipment manufacturing and international level is a big gap thus expected to improve the situation.

Dingli company look forward to your inquiry. You can by e-mail:dingli@dlbio-dryer.com or website:http://www.dewatering-machine.com/.