The difference between fluidized bed jet mill and flat jet mill
The fluidized bed jet mill is named because the material is in a fluidized state during the crushing process in the cavity; the disc jet mill is also called the supersonic jet mill or the flat jet mill.
The main differences between fluidized bed jet mill and disc jet mill are as follows:
1. The difference in crushing methods
The fluidized bed jet mill is driven by high-pressure airflow to achieve crushing by the material itself at the intersection of 4 or 3 nozzles. Because it does not collide with other materials, there is no material pollution and other phenomena. At the same time, the crushing effect is also good for materials with high hardness, and it does not affect the life of the equipment.
The disc type jet mill is the material that directly impacts the inner wall of the crushing chamber through the airflow, and the collision realizes the crushing. Therefore, the crushing process has the phenomenon of abrasion on the inner lining of the crushing chamber inner wall, and the material may be contaminated. At the same time, the lining needs to be regularly Replacement, the cost of spare parts is higher.
2. The nozzle arrangement is different
The nozzle of the fluidized bed jet mill is perpendicular to the pulverizing cavity, and the pulverizing nozzle of the disc jet mill is tangent to the pulverizing chamber.
3. The way to control the granularity is different
The fluidized bed jet mill controls the particle size by adjusting the high-speed rotation speed of the grading wheel, and the particle size accuracy is well controlled; while the disc jet mill is only adjusted by adjusting the feeding speed, and the particle size is not easy to control.
4. The system wind pressure is different
The entire pulverization process of the fluidized bed jet mill is a negative pressure process, and the induced draft fan behind the system needs a high-pressure type. The entire pulverization process has no dust leakage and does not pollute the production environment. The disc-type jet mill is a positive pressure type, which does not require high induced draft fans, and even eliminates the need for induced draft fans and dust collectors. The crushing process is likely to cause dust leakage and the production environment is easily polluted.
5. The control cabinet has different methods and different costs
Because the fluidized bed jet mill controls the particle size by adjusting the high-speed rotation of the classification wheel, it needs a frequency converter to control it, so the cost is relatively high. The disc jet mill does not have high control requirements, but controls other systems such as discharge valves or dust collectors, and the relative cost is also very low.
6. The particle size distribution of the finished product is different
Compared with the flat jet mill, the fluidized bed jet mill has a narrower particle size distribution and better particle size uniformity.