Cantilever side door vacuum rake dryer (patent)

The vacuum rake dryer device uses a steam jacket (or thermal oil, hot water) to indirectly heat materials and exhausts them under high vacuum, making it particularly suitable for drying materials that are not resistant to high temperatures, are prone to oxidation at high temperatures, or are prone to powder production during drying (such as various fuels), as well as materials that must be recovered from evaporated liquids during the drying process. In the vacuum rake dryer, the moisture content of the dried material at the inlet can reach up to 90%, while the lowest is only 15%. The dried material can be in the form of slurry, paste, granular, powdery, or fibrous. The moisture content of these materials after drying can generally reach 0.1%, or even 0.05%.

brief introduction

Vacuum rake drying has a simple structure, easy operation, long service life, stable and reliable performance, low steam consumption, strong applicability, and good product quality. It is particularly suitable for drying paste like materials that are not resistant to high temperatures, flammable, and prone to oxidation under temperature control. This machine has been proven to be a good drying equipment by users after long-term use.

Equipment principle

Vacuum rake dryer is widely used in organic semi-finished products and fuel drying operations in the chemical industry.
The vacuum rake dryer device uses a steam jacket (or thermal oil, hot water) to indirectly heat materials and exhausts them under high vacuum, making it particularly suitable for drying materials that are not resistant to high temperatures, are prone to oxidation at high temperatures, or are prone to powder production during drying (such as various fuels), as well as materials that must be recovered from evaporated liquids during the drying process. In the vacuum rake dryer, the moisture content of the dried material at the inlet can reach up to 90%, while the lowest is only 15%. The dried material can be in the form of slurry, paste, granular, powdery, or fibrous. The moisture content of these materials after drying can generally reach 0.1%, or even 0.05%.
The dried material is added from the center of the shell, and under the stirring of the constantly rotating rake teeth, the surface of the material constantly updates when it comes into contact with the shell wall. The dried material is indirectly heated by a heat source, causing the moisture of the material to vaporize. The vaporized moisture is promptly removed by a vacuum pump. Due to the high degree of vacuum in operation, the surface moisture vapor pressure of the dried material is much higher than the moisture vapor pressure in the evaporation space inside the drying machine, which is conducive to the discharge of moisture inside and on the surface of the dried material, and facilitates the movement of water molecules in the dried material to achieve the purpose of drying.

characteristic

(1) Strong adaptability and wide application. 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 drying explosive, easily oxidized, and paste like materials.

(2) The good product quality is due to the continuous forward and backward rotation of the rake teeth during the drying process, which evenly mixes the dried material and avoids overheating of the material, making it easy for moisture to escape and resulting in a low-temperature product. Due to the fine particle size of the product, it can be packaged without crushing.

(3) The low steam consumption is due to the fact that vacuum rake dryers often use steam to pass through the jacket and use latent heat to heat the material. The steam consumption per kilogram of finished product is generally 1.3-1.8 kg.

(4) Easy to operate, the vacuum rake dryer is easy to operate, has a small staffing requirement, and low labor intensity. Due to the reduction of material leakage losses, environmental hygiene has been improved.

The main disadvantages of vacuum rake drying are complex structure and high cost. Due to intermittent operation, the drying time is long and the stock yield is low; Due to the difficulty in clearing materials, it is not suitable to frequently switch varieties in production. At the same time, in order to ensure the vacuum degree, it is necessary to regularly maintain and repair the vacuum device.

Main components

1. Shell; 2. Rake teeth; 3. Discharge device; 4. Feeding device; 5. Crushing rod; 6. Sealing device; 7. Mixing shaft; 8. Transmission device

Applicable materials

Mud like high paste like materials below 100 mesh, various pigments, mud like materials filtered and centrifuged, and pure alkali detergent

Alkali stone starch, dyes and pigments, clay ash, and other cement materials such as clay