The new type of rotary flash dryer adopts a variety of devices, such as a variety of feeding devices, so that the feeding is continuous and stable, and the feeding process will not cause bridging; the bottom of the dryer uses a special cooling device to avoid the occurrence of materials in the bottom high temperature zone Wall sticking and deterioration; special air pressure sealing device and bearing cooling device are used to effectively extend the service life of the transmission part; special air distribution device is adopted to reduce equipment resistance and effectively provide the processing air volume of the dryer; the drying chamber is installed There are grading rings and swirling blades, which can adjust the fineness and final moisture of the materials; the stirring and crushing device is used to produce strong shearing, blowing, and rotating effects on the materials; the air filter, cyclone separator, bag filter, etc. are used, 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, the experienced drying equipment manufacturer in Changzhou will introduce to you the four major process design methods of the rotary flash dryer!
1. Determination of drying room
The rotary flash dryer processes the evaporation intensity of some materials. The volume heating method is the theoretical design method of the rotary flash dryer. However, the key volume heating coefficient in this method is difficult to determine, so it lacks operability. The evaporation intensity method is an indirect method of the volumetric heating method. As long as there is certain 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 based on the amount of evaporated water and the evaporation intensity, and then calculates the effective height based on the relationship between the diameter and the height.
2. Drying chamber diameter
Another method is to calculate the required air consumption through material balance and heat balance calculation, 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 the drying chamber through the annular gap in a tangential direction. The materials in the drying chamber make a spiral rotating upward movement under the action of the hot air blowing and the push of the agitator. When studying the fluid motion of smaller particles under the action of centrifugal force field, the influence of gravity is very small, so it can be ignored.
4. The application of rotary flash dryer
Part of the operating conditions of the rotary flash dryer, the upper part of the drying chamber is equipped with a grading ring, its main function is to separate large or undried materials from qualified products. Blocking in the drying chamber can effectively ensure the product size and moisture requirements. Replacing grading rings with different diameters can meet the product particle size requirements. The hot air inlet at the bottom of the cone is equipped with cold air protection to prevent the material from overheating and deterioration due to contact with high temperature air. The drying system is closed and operates under slight negative pressure to prevent dust from leaking, protect the production environment, and be safe and sanitary.