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The new equipment of the rotary flash dryer adopts a variety of advanced devices, such as a variety of feeding devices, so that the feeding is continuous and stable, and there will be no bridging phenomenon in the feeding process; A special cooling device is adopted at the bottom of the dryer to avoid wall sticking and deterioration of materials in the high temperature zone at the bottom; Special air pressure sealing device and bearing cooling device are adopted to effectively prolong the service life of the transmission part; Special air distribution device is adopted to reduce the resistance of the equipment and effectively provide the processing air volume of the dryer; The drying chamber is equipped with a grading ring and a swirl plate, which can adjust the fineness and final moisture of the material; Mixing and crushing device is adopted to produce strong shearing, blowing and floating and rotating effects on materials; Air filter, cyclone separator, bag filter, etc. are used to effectively remove dust and avoid environmental and material pollution. The equipment has strong mass transfer and heat transfer, high production intensity, short drying time and short material retention time. So let's introduce the four process design methods of rotary flash dryer to you today by the experienced drying equipment manufacturer in Changzhou!
1、 Determination of drying chamber
The volume heat supply method is the theoretical design method for the rotary flash dryer to deal with the evaporation intensity of some materials. However, the key volume heat supply coefficient in this method is difficult to determine, so it is lack of operability. Evaporation intensity method is an indirect method of volumetric heating method, which can be calculated as long as there are certain experimental data. It is often used in industrial design. The evaporation intensity method calculates the volume of the drying chamber according to the evaporation volume and evaporation intensity, and then calculates the effective height according to the relationship between diameter and height.
2、 Drying chamber diameter
The other 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.
3、 Height and grading particle size of dryer
The hot air from the hot air distributor enters the drying chamber through the annular gap in the tangential direction, and the materials in the drying chamber are spirally rotating and rising under the action of the hot air blowing and the drive of the agitator. When studying the fluid motion of small particles under the action of centrifugal force field, the influence of gravity is very small, so it can be ignored.
4、 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, which is mainly used to separate the materials with large particles or not dried from the 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 requirements of product granularity. The hot air population at the bottom of the cone is provided with cold air protection to prevent the material from overheating and deterioration in contact with high temperature air. The drying system is closed and operates under micro-negative pressure, so the dust does not leak out, and the production environment is protected, safe and healthy.