Fluidized bed airflow pulverizer

working principle

1) The material is fed into the silo through a star valve, and the screw feeder sends the material into the crushing chamber or directly into the crushing chamber;

2) The supersonic jet generated by the rapid expansion and acceleration of compressed air through the crushing nozzle forms a centripetal counter jet flow field in the lower part of the crushing chamber. Under the action of pressure difference, the material at the bottom of the grinding chamber becomes fluidized. The accelerated material converges at the intersection of multiple nozzles, producing intense impact, collision, and friction for crushing;  

3) The crushed material moves along with the rising airflow to a certain height in the upper part of the crushing chamber. Coarse particles fall back along the wall of the grinding chamber to the lower part under the action of gravity, while fine powder moves along with the airflow to the upper turbine classifier.  

4) In the flow field generated by the high-speed turbine, coarse particles are thrown towards the cylinder wall under the action of centrifugal force and fall back to the lower part of the grinding chamber along with the stalled coarse powder for further crushing.  

5) Micro powder that meets the fineness requirements is transported through a graded flow channel and an exhaust pipe to a cyclone separator for product collection. A small amount of micro powder is further separated into gas-solid by a bag filter, and purified air is discharged from the outside of the machine by an induced draft fan.  

6) The connecting pipe can maintain consistent pressure between the silo and the crushing chamber.  

7) The upper and lower material levels of the silo are automatically controlled by precision level sensors for star shaped valve feeding, while the material level in the crushing chamber is automatically controlled by the dynamic current transmitter on the classifier for screw feeder feeding speed, ensuring that the crushing is always in the optimal state.

Working characteristics

1. Crushing relies on the mutual impact between powders, with low probability of impact with the cavity, light wear, and low equipment maintenance costs;

2. The integrated design of crushing and grading ensures that the particle size of the product is uniform and controllable, with a narrow distribution range and no large particles mixed in. It is particularly suitable for particles with particle size requirements between D90 and Dmax;

3. The powder receiving part (including grading wheels) can be customized according to customer requirements, such as 304/316/316L/alumina/zirconia/PTFE/tungsten carbide, etc;