Product Overview:
The SXG series rapid rotary flash dryer is a new type of drying equipment developed by our company based on the introduction and absorption of advanced foreign technology. The machine has advanced technology, reasonable design, compact structure, wide applicability, high production capacity, good product quality, high efficiency and energy saving. It can dry, crush and screen in one device, eliminating environmental pollution. The overall performance of the machine has reached the international advanced level. The flash dryer has the original bearing induction cooling (water cooling), which is designed to be connected with an oil pump to lubricate and cool the bearings. The sealing device has excellent performance. The main shaft design adopts a semi ring type, and the motor uses a speed regulating motor, which has smooth transmission, low noise, and a service life 10 times that of similar products.
working principle:
Hot air enters the mixing and crushing drying chamber from the bottom of the dryer at a suitable spraying speed through the inlet pipe, generating strong shear, blowing, and rotating effects on the material. As a result, the material is subjected to centrifugation, shear, collision, and friction, and is atomized, enhancing mass and heat transfer. At the bottom of the dryer, larger and wetter particle clusters are mechanically crushed by the agitator, while particles with lower moisture content and smaller particle size are carried up by the rotating airflow and further dried during the upward process. Due to the rotating flow of gas-solid phases, the inertia of the solid phase is greater than that of the gas phase, and the relative velocity between the solid and gas phases is higher, which enhances mass and heat transfer between the two phases. Therefore, the production intensity of this machine is high.
The working principle of flash drying machine is relatively easy to understand. We can divide the entire drying process into four stages - crushing stage, gas-solid mixing stage, drying stage, and particle size classification stage.
Crushing stage: Crushing is the first and most important step in the entire flash drying process. The dried material is mainly in the form of paste and filter cake. If it is not crushed, flash drying cannot be carried out. Therefore, we can conclude that materials with strong viscosity have poor drying effect when directly using a flash dryer, and appropriate additives need to be added to avoid material agglomeration. The main process is to mix the stirring plate with the high-speed rotating gas to complete the crushing.
Gas solid mixing stage: After crushing, the material is fully in contact with the heating medium in the flash drying main tower. The quality of gas-solid mixing determines the overall drying rate. In order to increase the airflow velocity, an inverted cone structure device is installed at the bottom of the flash dryer.
Drying stage: This process is the process of hot air evaporating material moisture. Unfinished materials fall under the influence of gravity and continue to break and dry; The dried material will move upwards and proceed to the next stage.
Particle size classification: A circular baffle is installed on the upper part of the drying machine, which is called a flash dryer classifier. When the material passes through the classifier, it will be subjected to centrifugal force, showing a spiral upward trend with different rotation radii. Materials with smaller particle sizes are discharged from the inner holes of the classifier; The larger particles of the material are left in the drying chamber for further crushing, and are discharged from the inner hole after reaching the standard particle size.
Equipment features:
Multiple feeding devices are available for selection, ensuring continuous and stable feeding without bridging during the process.
A special cooling device is installed at the bottom of the dryer to avoid material deterioration in the high-temperature zone at the bottom.
Special pneumatic sealing device and bearing cooling device effectively extend the service life of the transmission part.
The special air distribution device reduces equipment resistance and effectively provides the processing air volume of the dryer.
The drying chamber is equipped with grading rings and swirl blades, and the material fineness and final moisture content can be adjusted (such as the final moisture content of calcium carbonate can be adjusted to ≤ 0.1%).
Compared to other drying methods, it can effectively increase the specific gravity of materials.
The drying chamber has a high circumferential gas velocity and short material residence time, effectively preventing material sticking to the wall and thermal sensitive material deterioration, achieving high efficiency, speed, small equipment, and large production.
Fast drying speed. The dryer can be completed in 1-10 seconds.
The retention time of materials can be adjusted. Adjustable between 1-500s, suitable for drying heat sensitive materials.
Multiple feeding devices are available for selection, ensuring continuous and stable feeding without any bridging phenomenon.
The drying chamber has a high circumferential gas velocity and a short residence time for materials, effectively preventing them from sticking to walls and causing thermal sensitive materials to deteriorate.
The drying chamber is equipped with grading rings and swirl blades, and the material fineness and final moisture content can be adjusted and controlled.
◆ High drying strength. For example, when drying starch at an inlet temperature of 140 degrees Celsius and an outlet temperature of 65 degrees Celsius, the volumetric heat transfer coefficient can reach up to 68540 KJ/(?·℃).
Structural diagram:
