Four process design methods for rotary flash dryer
Sources： | Release date：
Description：The new equipment of rotary flash dryer adopts a variety of devices. For example, a variety of feeding devices are used to make the feeding continuous and stable, and the feeding process does not cause bridging; the bottom of the dryer uses a special …
The new equipment of rotary flash dryer adopts a variety of devices. For example, a variety of feeding devices are used to make the feeding continuous and stable, and the feeding process does not cause bridging; the bottom of the dryer uses a special cooling device to avoid 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 contamination. The device has strong mass transfer heat transfer, high production intensity, short drying time and short material residence time. So today, the experienced drying equipment manufacturers in Changzhou will introduce the four process design methods of rotary flash dryers!
一、The determination of the drying room
The rotary flash dryer processes the evaporation intensity of some materials. The volumetric heating method is the theoretical design method of the rotary flash dryer. However, the critical volumetric heat coefficient in this method is difficult to determine, so it lacks operability. Evaporation intensity method is an indirect method of volumetric heating method. It can be calculated as long as there is certain experimental data. It 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.
二、Drying chamber diameter
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.
三、Dryer height and 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 in the drying chamber is spirally rotated and raised under the action of the hot air blowing and the agitator. When studying the fluid motion of smaller particles under the action of the centrifugal force field, the effect of gravity is small and therefore negligible.
四、Rotary flash dryer application
The operating conditions of the partial rotary 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.