The new equipment of flash dryer uses a variety of advanced equipment, such as the use of a variety of feeding devices, so that the feeding is continuous and stable, the bridging phenomenon will not occur in the feeding process; the special cooling device is used at the bottom of the dryer to avoid the material in the high temperature zone at the bottom. Sticky wall and deterioration phenomenon; 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 adopted to reduce the resistance of the equipment and effectively provide the treatment air volume of the dryer; There are grading ring and swirling sheet, 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. The device has strong mass transfer heat transfer, high production intensity, short drying time and short material residence time. So today, the experienced Jiangsu Zhenxing drying equipment manufacturers introduce the four process design methods of rotary flash dryers!
First, the determination of the drying room
The flash dryer is used to treat the evaporation intensity of some materials. The volumetric heating method is the theoretical design method of the rotary flash dryer. However, the most critical volumetric heat coefficient in this method is difficult to determine, so it lacks operability. The evaporation strength method is an indirect method of volumetric heating method, which can be calculated as long as there is certain experimental data, and is a method commonly used in industrial design. The evaporation strength method calculates the volume of the drying chamber based on the amount of evaporated water and the evaporation strength, and calculates the effective height based on the relationship between the diameter and the height.
Second, the diameter of the drying chamber
Another method is to calculate the required air consumption by material balance and heat balance, and then determine the diameter of the dryer according to the air speed range.
Third, 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, and the material of the drying chamber is spirally rotated and raised under the action of hot air blowing and the agitator. When studying the fluid motion of smaller particles under the action of a centrifugal force field, the effect of gravity is small and therefore negligible.
Fourth, the application of flash dryer
The operating conditions of the partial flash dryer, the upper part of the drying chamber is provided with a step ring, the main function of which is to separate the material with large or no dry particles from the qualified product, and the product in the drying chamber can effectively ensure the product granularity and moisture requirement. Replacing the grading rings of different diameters can meet the product size requirements. Cold air protection is provided at the hot air population at the bottom of the cone to prevent the material from coming into contact with high temperature air to cause overheating. The drying system is closed and operates under micro-negative pressure. The dust does not leak, protecting the production environment, and being safe and hygienic.
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