Four process design methods of rotary flash dryer

The new equipment of the rotary flash dryer adopts a variety of advanced devices, such as the use of multiple feeding devices to make the feeding continuous and stable, and the bridging phenomenon will not occur during the feeding process; the special cooling device at the bottom of the dryer avoids the material in the high temperature area at the bottom Wall sticking and deterioration occur; special air pressure sealing device and bearing cooling device are used to effectively extend the service life of the transmission part; special air separation device is used to reduce the resistance of the equipment and effectively provide the treatment air volume of the dryer; drying room Equipped with grading ring and cyclone, which can adjust the fineness and final moisture of the material; adopting agitating and crushing device to produce strong shearing, blowing and rotating effects on the material; using air filter, cyclone separator, bag filter, etc. , Effectively remove dust and avoid environmental and material pollution. The equipment has strong mass and heat transfer, high production intensity, short drying time and short material residence time. So today, experienced drying equipment manufacturers in Changzhou will introduce the four process design methods of the rotary flash dryer!

1. Determination of drying room
The rotary flash dryer handles the evaporation intensity of some materials. The volumetric heating method is the theoretical design method of the rotary flash dryer. However, the key volumetric heating coefficient in this method is difficult to determine, so it lacks operability. Evaporation intensity method is an indirect method of volumetric heating method, as long as there is a certain amount of experimental data, it can be calculated, and it is a method commonly used in industrial design. The evaporation intensity method calculates the volume of the drying chamber according to the amount of evaporated water and the evaporation intensity, and then calculates the effective height according to the relationship between the diameter and the height.

Second, the diameter of the drying room
Another method is to calculate the required air consumption through material balance and heat balance, and then determine the diameter of the dryer according to the air speed range.

3. The height of the dryer and the graded particle size
The hot air from the hot air distributor enters into the drying room through the annular gap in a tangential direction, and the materials in the drying room are driven by the hot air blowing and driven by the agitator to spirally move upward. When studying the fluid movement of small particles under the action of centrifugal force field, the effect of gravity is very small, so it can be ignored.

4. Application of rotary flash dryer
Operating conditions of some rotary flash dryers. The upper part of the drying room is equipped with a grading ring. Its main function is to separate materials with large particles or not dried from qualified products. Blocking in the drying room can effectively ensure product particle size and moisture requirements. Replacing the grading rings with different diameters can meet the product size requirements. The hot air at the cone bottom is equipped with cold air protection to prevent the material from coming into contact with high-temperature air to cause overheating and deterioration. The drying system is closed, and it operates under slight negative pressure, and the dust does not leak out, which protects the production environment and is safe and hygienic.