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Rotary Flash Dryer Four Process Design Methods

Source: | Date: 2017-12-19 | Hits:
Keywords: Rotary Flash Dryer Four Process Design Methods
The new equipment of the rotary flash dryer adopts a variety of advanced devices, such as the use of a variety of feeding devices, so that the feeding is continuous and stable, the filling process will not produce bridging phenomenon; the bottom of the dryer uses a special cooling device to avoid the material in the bottom of the high temperature area Viscous wall and metamorphism 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 adopted to reduce the resistance of the equipment and effectively provide the processing air volume of the dryer; the drying room With grading rings and swirling pieces, the fineness and final moisture of the material can be adjusted; the stirring, smashing device is used to produce strong shearing, blowing and rotating effects on the materials; using air filters, cyclone separators, bag filter, etc. Effectively remove dust and avoid environmental and material pollution. The device has strong mass transfer and heat transfer, high production intensity, short drying time and short material residence time. Nowadays, the four major process design methods of rotary flash dryer are introduced by the experienced Changzhou drying equipment manufacturers.

First, the determination of the drying room
Evaporation intensity spin flash dryer material processing section, to the volume of the theoretical design method is a method of heat spin flash dryer, but this process is critical to the volume of heat transfer coefficient is difficult to determine, so the lack of maneuverability. Evaporation intensity method is an indirect method of volumetric heating method. It can be calculated as long as there is a certain amount of experimental data. It is a method commonly 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.

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

Third, the dryer height and classification particle size
The hot air coming from the hot air distributor enters the drying room through the annular gap in the tangential direction. The materials in the drying chamber are spirally rotated and ascended under the action of the hot air blowing and the agitator. When studying the fluid motion of smaller particles under centrifugal force, the effect of gravity is very small and therefore negligible.

Fourth, the application of rotary flash dryer

Part of the operation conditions of the rotating flash dryer, the upper part of the drying chamber is provided with a grading ring, the main function of which is to separate the material with large or no granules from the qualified product, and block the product in the drying room to effectively ensure the product particle size and moisture requirements. Replace different grading rings to meet product particle size requirements. The hot air with cone-bottom hot air has cold wind protection to prevent the material from overheating and deterioration due to contact with high-temperature air. Drying system is closed, and operates under micro-negative pressure, dust is not leaked outside to protect the production environment, safety and health.

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