The rotary flash dryer was independently developed and designed by our factory after consulting relevant materials. This machine features a reasonable design, compact structure, and wide application range. It can be used for drying paste-like materials with high moisture content in various chemical and light industrial sectors such as pigments, dyes, fine chemicals, pesticides, fertilizers, feed, food, pharmaceuticals, and electronics. It achieves high efficiency, speed, energy saving, large-scale production with small equipment, and continuous operation. It is a domestic first and has reached the advanced level of the 1990s.
When undertaking non-standard designs, our factory uses CAD design, which has the advantages of being fast, convenient, time-saving, and accurate.
Rotary Flash Dryer Working Process
Hot air enters the bottom of the dryer at a suitable jet speed through the inlet pipe and enters the mixing and pulverizing drying chamber. This generates strong shearing, blowing, and rotating effects on the material, causing it to be micronized through centrifugal force, shearing, collision, and friction, thus enhancing mass and heat transfer. At the bottom of the dryer, larger and wetter particle clusters are mechanically broken down by the agitator, while smaller particles with lower moisture content are carried upwards by the rotating airflow for further drying during the ascent. Because of the rotating flow of the gas and solid phases, the solid phase has greater inertia than the gas phase, resulting in a higher relative velocity between the two phases. This enhances heat and mass transfer between the two phases, leading to high production intensity.
Features of the Rotary Flash Dryer
The material is micronized and highly dispersed due to centrifugal force, shearing, collision, and friction. The high relative velocity between the gas and solid phases further enhances heat and mass transfer, resulting in high production intensity.
The drying gas enters the bottom of the dryer, generating a strong rotating airflow that strongly washes away material on the walls, eliminating adhesion.
In the high-temperature zone at the bottom of the dryer, heat-sensitive materials do not directly contact the hot surface, solving the problem of charring and discoloration of heat-sensitive materials.
The high circumferential air velocity and short material residence time within the drying chamber enable high efficiency, speed, and large-scale production with a small equipment.
Swirl vanes are installed inside the drying chamber to control the material moisture content to an extremely low level.
A disperser at the top of the drying chamber controls the particle size and humidity of the outlet material.
