Vacuum rake drying has the advantages of simple structure, convenient operation, long service cycle, stable and reliable performance, small steam consumption, strong applicability and good product quality. It is especially suitable for drying paste materials which are not resistant to high temperature, flammable and easy to oxidize under temperature regulation. It has been proved to be a good drying equipment by users for a long time.
Rationale:
vacuum rake dryer is a new horizontal intermittent vacuum drying equipment. The wet materials are evaporated by conduction and equipped with a scraper agitator to continuously remove the materials on the hot surface, and move in the container to form a circulating flow. After evaporation, the water is pumped out by the vacuum pump. Vacuum rake dryer is widely used in drying operation of organic semi-finished products and fuel in chemical industry.
In the vacuum rake dryer, the moisture content or solvent content of the material to be dried is as high as 90%, while that of the material with low Zui is only 15%. The materials to be dried are slurry, paste, granular, powdery, or fibrous. The moisture content of these materials after drying is generally 0.1%, even 0.05%.
the dried material is added from the middle of the shell. Under the stirring of the continuously rotating rake teeth, the surface of the material is constantly updated when it contacts with the shell wall. The dried material is indirectly heated by the steam, and the moisture of the material is vaporized. The vaporized water is timely pumped out by the vacuum pump. The machine can simultaneously heat the interlayer and the rake teeth at the same time, so that the heat transfer area is larger and the thermal efficiency is higher, So that it can obtain higher drying efficiency. Due to the high operating vacuum, the water vapor pressure on the surface of the material to be dried is far greater than that in the evaporation space in the drying cabinet, which is conducive to the discharge of internal and surface moisture of the dried material, and the movement of water molecules of the dried material, so as to achieve the purpose of drying.
Special points:
(1) Due to the use of jacket heating and high vacuum exhaust, the rake vacuum dryer is suitable for almost all materials with different properties and states, especially for the drying of explosive, easily oxidized and paste materials.
(2) The product is of good quality. During the drying process, the rake teeth are constantly rotating forward and backward, and the dried materials are stirred evenly to avoid overheating of the materials, and the moisture is easy to escape, and the shell can get low temperature products. Due to the fine particle size of the product, it can be packed without crushing.
(3) The steam consumption is small. Because the vacuum rake dryer uses more steam to pass into the jacket and uses latent heat to heat the material, the steam consumption per kilogram of finished product is small, generally 1.3-1.8 kg steam.
(4) According to the different characteristics and requirements of drying materials, the sealing system of dryer can choose two kinds of packing seal and mechanical seal. The special design ensures the sealing performance and service life.
(5) Easy to operate vacuum rake dryer, easy to operate, less staff, low labor intensity. The environmental hygiene was improved because of the decrease of material loss.
The main disadvantages of vacuum rake drying are: complex structure and high cost. Because of the intermittent operation, long drying time and low yield, it is not suitable to change varieties frequently because of the difficulty in clearing materials. At the same time, in order to ensure the vacuum degree, it is necessary to maintain and repair the vacuum device frequently.
Applicable materials:All kinds of pigments, mud head materials and soda detergent, alkali stone starch, dye pigment, clay ash, clay, cement, etc. are filtered and centrifuged.
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