DZPG/GMP medicinal single arm vacuum rake dryer
Medicinal single-arm vacuum rake dryer
Vacuum rake drying has the characteristics of simple structure, convenient operation, long service life, stable and reliable performance, low steam consumption and strong application performance. The product is of good quality, especially suitable for drying paste materials that are not resistant to high temperature, flammable, and easily oxidized under temperature adjustment. This machine has been used by pharmaceutical companies for many years and proved to be a reliable GMP standard drying equipment.
The vacuum rake dryer is a novel horizontal batch 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. After the water has evaporated, it is pumped out by a vacuum pump. Vacuum rake dryers are widely used in organic semi-finished products and fuel drying operations in the chemical industry.
The vacuum rake dryer device indirectly heats the material with a steam jacket and exhausts it under high vacuum. Therefore, it is especially suitable for the drying operation of materials that are not resistant to high temperatures and are easy to oxidize at high temperatures or materials that are easy to produce powder during drying (such as various fuels), as well as materials that must be recovered during the drying process. The moisture content or solvent content of the dried material in the vacuum rake dryer is up to 90%, and the lowest is only 15%. The material to be dried is in the form of slurry, paste, granular, powder, or fibrous. The moisture content of these materials after drying generally reaches 0.1% or even 0.05%.
The material to be dried is added in the middle of the upper part of the shell. Under the stirring of the continuously rotating rake, the surface of the material is constantly updated when it contacts the shell wall, and the dried material is indirectly heated by steam to vaporize the moisture of the material. The vaporized water is pumped away in time by the vacuum pump. The machine can simultaneously 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 degree of operating vacuum, the water vapor pressure on the surface of the dried material is much greater than the water vapor pressure in the evaporation space in the dryer shell, which facilitates the discharge of internal and surface moisture in the dried material and facilitates the movement of water molecules in the dried material , To achieve the purpose of drying.
(1) Strong adaptability and wide application.
Because the rake vacuum dryer uses jacket heating and high vacuum exhaust, it is suitable for almost all materials with different properties and different conditions. It is especially suitable for drying of explosive, oxidizable and paste-like materials.
(2) Good product quality
During the drying process, the rake teeth continue to rotate positively and negatively, so that the dried material is stirred evenly to avoid overheating of the material. Because the product has a fine particle size, it can be packaged without crushing.
(3) Low steam consumption
Because the vacuum rake dryer mostly uses steam to pass into the jacket, it uses latent heat to heat the material, and the steam consumption per kilogram of finished product is small, generally 1.3-1.8kg steam.
(4) According to the different characteristics and requirements of the drying material, the sealing system of the dryer can choose two kinds of packing seal and mechanical seal. The special design guarantees airtightness and service life.
(5) Easy to operate
The vacuum rake dryer is easy to operate and has low labor intensity. As the loss of material escape is reduced, environmental sanitation is improved.
The main disadvantages of vacuum rake drying are:
The structure is complex and the cost is relatively expensive. Because it is intermittent operation, the drying time is long, and because it is not easy to clear the material, it is not suitable for the production of frequently changing varieties. At the same time, in order to ensure the degree of vacuum, the vacuum device must be regularly maintained.
Slurry, high-paste material below 100 mesh. Various pigments, mud-like materials, soda ash detergent, alkali stone starch, dye pigments, clay ash, clay, cement, etc.