The principle of the vacuum rake dryer: the material to be dried is added from the top of the shell in the middle, and under the stirring of the rake teeth that are constantly rotating forward and backward, the material moves back and forth in the axial direction, and the surface in contact with the inner wall of the shell is constantly updated, and it is indirectly affected by the steam. Heating, uniform stirring of the rake teeth, and crushing of the crushing rods make the surface water of the material more beneficially discharged. The vaporized water passes through the dry dust collector, wet dust collector, condenser, and vents the vacuum rake dryer from the vacuum pump outlet.
When the vacuum rake dryer is in operation, start the agitator first, add the dried material, and close the feeding port. At the same time, it is heated by steam, and the pressure of the heating steam is generally 0.2~0.4Mpa (gauge pressure).
Use a vacuum pump to extract water vapor and non-condensable gas. Generally, when the material is dried, the vacuum degree is about 700mmHg. The moisture evaporation intensity of this dryer varies with the nature of the material, humidity, heating steam pressure and vacuum degree. For example, when the vacuum degree is 700mmHg and the heating steam pressure is 0.2Mpa (gauge pressure), the potato starch is dried from the initial moisture content of 40% to 20%, and the moisture evaporation intensity of the dryer is 5~7kg/m2h.
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