Factors affecting the drying speed of double cone rotary vacuum dryer

The concept of vacuum drying speed of double cone rotary vacuum dryer is the drying process of materials. Firstly, the moisture on the surface of the material is vaporized by heat and removed by vacuum equipment. The moisture on the surface of the material is gradually reduced by vaporization, and the temperature is formed between the inside and the surface of the material. difference. The internal moisture diffuses to the surface under the influence of the temperature difference and vaporizes after reaching the surface. In addition, during the vacuum drying process, there is a pressure difference at the same time, so that the vaporized water molecules accelerate toward the vacuum space. In the vacuum drying process of the double cone rotary vacuum dryer, people always want to speed up the drying speed and shorten the drying time, but the factors affecting the drying speed are as follows:
(1) The condition of the material to be dried (such as material shape, size and size, stacking method), the moisture content, density, viscosity and other properties of the material itself. Generally, when the material particles are fine and uniform, the pile is loosened, and the thickness is thin, the internal moisture is easily diffused. If the initial temperature of the material is increased, the treatment before vacuum filtration, and the moisture content of the material are reduced, the vacuum drying speed can be increased.
(2) The higher the degree of vacuum, the more favorable the vaporization of water at a lower temperature, but the excessive vacuum is unfavorable for heat conduction, which will affect the heating effect on the material.
In order to improve the drying speed of the material, the degree of vacuum should be considered comprehensively according to the characteristics of the material. Generally, the degree of vacuum should not be less than 1 x 104 Pa.
Factors affecting the drying speed of the double cone rotary vacuum dryer The drying process of the double cone rotary vacuum dryer was tested. The vacuum, drying temperature, steam pressure and drying time were used as parameters. The curves of the test showed that: double cone rotary vacuum drying The machine drying process can be divided into five categories: *heating, *constant temperature, second heating, second constant temperature and cooling. among them:
(1) * Warming is a preheating stage in which the material is heated to warm it up. In this stage, the amount of water vaporization in the material is small;
(2) * The constant temperature is a constant-speed drying stage in which the free water, surface water, and capillary water of the material are vaporized in large amounts. Therefore, the temperature and the vacuum are in a constant state, and the degree of vacuum is approximately equal to the saturated vapor pressure of the water at the drying temperature;
(3) The second temperature rise is a process of heating the internal moisture of the material to the surface of the material, and the temperature of the vaporization is small, so that the temperature of the material rises and the true degree also increases;
(4) The second constant temperature is the stage in which the vaporized material envelops the water and the partially crystallized water, and the dry water mobility is determined by the vaporization rate, so the temperature and the vacuum are in a stable state;
(5) At the beginning of the cooling phase, the heating steam is turned off, and the cooling water is passed to the jacket jacket, and the cylinder is cooled to lower the temperature of the internal material to discharge the dried product.
The different stages of the drying process of the double-cone rotary vacuum dryer have different properties, so different operating parameters should be set according to their different stages, so that the function of the equipment can be utilized more effectively.

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