Rotary flash dryer
Rotary flash dryer principle:
XSG system rotary flash dryer is a utility model patented product developed and designed by our company, which adopts foreign advanced technology and combines the actual situation of domestic drying.
The hot air enters the flash dryer main tower tangentially from the air inlet at the bottom of the host, forming a spiral rising high-speed rotating airflow in the flash dryer main tower, and at the same time adjusting the bottom ring gap according to different material properties, so that the wind speed is at the maximum The best fit. The material directly enters the flash drying tower through the screw feeder. Under the impact and driving of the high-speed airflow, the material is quickly dispersed and made to rotate at high speed with the airflow. For relatively large and moist particles, the high-speed air flow is not enough to break it and rotate at high speed, so it gradually falls under the action of gravity. When it falls to the bottom of the host, it is forcibly broken and micronized by the crushing device set at the bottom, and then follows the high-speed air flow. Rotate and rise together to complete the drying process. In order to make the final moisture content of the material extremely low and not to affect the product quality due to the fluctuation of the initial moisture, a multi-layer swirl blade is set in the drying tower to form a more stable fluidized bed. At the same time, the swirl blade also ensures the drying. The required dwell time and grading effect.
Features of rotary flash dryer :
1. The tangential air inlet of the double air duct is adopted to avoid the velocity unevenness of the rotating field in the radial flow field.
2. Effectively control the final moisture and fineness, and control it through the coordination and unification of the swirl blade and the inlet air speed.
3. The rotating blade has a unique arrangement structure, which has the characteristics of low wear, wide contact surface and large cutting force.
4, good at handling heat-sensitive materials, the bottom of the host belongs to the high temperature area, the area has a high air velocity and there is a cooling water protection device to avoid the possibility of material coking and discoloration.
5. Small system resistance, high thermal efficiency, good operating environment and low labor intensity.
6. The new type sealing structure for the main engine, the main engine bearing life cycle is extended and the bearing seat is provided with a water spacer circulating cooling device.
Rotary flash dryer process
The air is heated by the heater to ~ 230 ° C and enters the rotary flash dryer . The wet material is fed into the screw feeding mechanism by the conveying device, and the screw feeder can be adjusted steplessly. The material is forced into the main tower after being squeezed, and then smashed by high-speed rotating blades with different angles. It is also impacted by the high-temperature air entering the main tower of the rotary flash dryer at high speed, rotating and entraining. At this time, the air temperature drops rapidly The material moisture quickly evaporates to complete the drying process. The dried material enters the pulse bag dust collector with high-speed high-temperature airflow. The air flow enters from the outside of the filter bag and is discharged upwards. To prevent the filter bag from accumulating, the high-pressure air flow (0.5 ～ 0.6Mpa) is input from the upper part of each filter bag by the pulse solenoid valve in turn, and the filter bag is repeatedly recoiled to achieve the best dust removal. effect.
Application range of rotary flash dryer
Inorganic substances: borax, calcium carbonate, hydroxide, copper sulfate, iron oxide, barium carbonate, antimony trioxide, various metal hydroxides, various inorganic salts, synthetic cryolite, etc.
Ceramics: kaolin, silica, clay, etc.
Food: Soy protein, gelatinized starch, distiller's grains, wheat sugar, wheat starch, etc.
Organic matter: Atrazine (pesticides), lauric acid, benzoic acid, benzoic acid, bactericidal, sodium oxalate, cellulose acetate, etc.
Dyes: anthraquinone, black iron oxide, indigo pigment, butyric acid, titanium hydroxide, zinc sulfide, various azo dye intermediates.
Technical parameters of flash dryer
Host ID (mm)
Air volume (m3 / h)
Evaporated moisture (kg / h)
Installed power (kw)
Floor area (m2)
See the table below for examples of typical material drying
Material water content (%)
Product water content (%)
Supply air temperature
20 ～ 25
Reactive Brilliant Red S-3B
Acid Medium Black T
Superfine calcium carbonate
Lithium manganese battery electrode powder
White carbon black
Iron oxide yellow
Iron oxide red
Pure calcium carbonate
Mycelium filter cake
Next: Vibration fluidized bed dryer