Four process design methods of rotary flash dryer
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The new type of rotary flash dryer adopts a variety of advanced devices. For example, a variety of feeding devices are used to make the feeding continuous and stable, and the feeding process will not cause bridging. The bottom of the dryer uses a special cooling device to avoid the material in the bottom high temperature area Adhesive walls and deterioration have occurred; special air pressure sealing device and bearing cooling device are used to effectively extend the service life of the transmission part; special air distribution devices are used to reduce the resistance of the equipment and effectively provide the air volume of the dryer; drying room Equipped with grading ring and cyclone, which can adjust the fineness and final moisture of the material; use the stirring and pulverizing device to produce strong shearing, blowing and rotating effects on the material; use air filter, cyclone separator, bag filter, etc. Effectively remove dust and avoid environmental and material pollution. This equipment has strong mass and heat transfer, high production intensity, short drying time and short material retention time. So today, experienced drying equipment manufacturers in Changzhou will introduce the four process design methods of rotary flash dryer!
First, the determination of the drying room
Rotary flash dryer handles the evaporation intensity of some materials. The volume heating method is the theoretical design method of rotary flash dryer. However, the key volume heating coefficient in this method is difficult to determine, so it lacks operability. Evaporation intensity method is an indirect method of volume heating method. As long as there is a certain amount of experimental data, it can be calculated. It is a method often 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.
Third, the height and size of the dryer
的 The hot air coming out of the hot air distributor enters the drying room through the annular gap in a tangential direction. The materials in the drying room make a spiral rotating upward movement under the action of hot air blowing and the impulse of the mixer. When studying the fluid motion of smaller particles under the action of centrifugal force field, the effect of gravity is small, so it can be ignored.
Application of rotary flash dryer
The operating conditions of some rotary flash dryers. The upper part of the drying chamber is provided with a classification ring. Its main function is to separate materials with larger particles or non-dried materials from qualified products. Blocking in the drying chamber can effectively ensure product particle size and moisture requirements. Replacing the classification rings with different diameters can meet the product granularity requirements. The hot air at the bottom of the cone is provided with cold air protection to prevent the materials from contacting with high-temperature air and causing overheating and deterioration. The drying system is closed and operated under a slight negative pressure, and the dust is not leaked, which protects the production environment and is safe and hygienic.