Detailed information

Overview:

Rake drying has the advantages of simple structure, convenient operation, long service cycle, stable and reliable performance, low steam consumption, strong applicability and good product quality, especially suitable for paste-like materials that are not resistant to high temperature, flammable, and easily oxidized under temperature regulation. The drying machine is proved to be a good drying equipment by users for a long time.

The rake dryer is a novel horizontal intermittent vacuum drying equipment. The wet material is evaporated by conduction, and the scraper agitator continuously removes the material on the hot surface, and moves in the container to form a circulating flow. Vacuum pump out. Rake dryers are widely used in organic semi-finished products and fuel drying operations in the chemical industry.

Principle and features:

Principle：The material to be dried is added from the top and middle of the shell. Under the stirring of the continuously rotating harrow teeth, when the material is in contact with the shell wall, the material to be dried is indirectly heated by steam, so that the moisture of the material is vaporized, and the vaporized moisture is pumped by the vacuum pump. If it is removed in time, the machine can use the interlayer and rake teeth to heat at the same time, the heat transfer area is larger, and the thermal efficiency is high, 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 much greater than the water vapor pressure of the evaporation space in the dryer shell, which is conducive to the discharge of internal moisture and surface moisture of the material to be dried, and is conducive to the movement of water molecules in the material to be dried. , and finally achieve the purpose of concentrating and drying the material.

Features:

(1) Strong adaptability and wide application. Because the rake dryer uses jacket heating and high vacuum exhaust, it is suitable for almost all materials of different properties and different states, especially suitable for explosive, easily oxidized, paste-like drying of materials.

(2) The quality of the product is good. The machine is equipped with stirring, so that the material forms a continuous circulation state in the drum, which further improves the drying process. The rake teeth continue to rotate forward and reverse, and the dried material is stirred evenly, which avoids overheating of the material and also reduces moisture content. Easy to escape, the shell gets a low temperature product. Due to the fine particle size of the product, it can be packaged without crushing.

(3) The machine adopts the sandwich heating method, which has large heat transfer surface and high thermal efficiency; the steam consumption is small. Because the rake dryer mostly uses steam and hot water to pass into the jacket, the latent heat is used to heat the material, and the steam consumption per kilogram of finished product is processed. The amount is small, generally 1.3-1.8kg steam.

(4) According to the different characteristics and requirements of the drying materials, the sealing system of the dryer can choose two kinds of packing seals and mechanical seals. The special design ensures the sealing performance and service life. The stirring device adopts casting, which can increase the transmission torque.

(5) Easy to operate, the rake dryer is easy to operate, with less staff and low labor intensity. Environmental hygiene is improved due to reduced material escape losses.

Main technical parameters: