(1) Increase the number of impeller blades
Because the more blades there are, the probability of impact on the fly ash particles passing through the blades per revolution of the impeller is higher and the centrifugal force field generated is greater. The thickness of the blade should be chosen as thin as possible because the thinner the blade, the smaller the resistance to dust gas passing through the impeller. Of course, the determination of the parameters must also consider the impeller’s rigidity, strength, and wear resistance. Excessively dense blades will increase the pressure loss and power consumption of the grading machine, as well as affect the normal grading.
(2) Reasonable classifier casing design
This is related to the shape of the classification room and the area. If the classifying chamber is too small, the fly ash powder will reflect randomly in the classifying chamber, making the turbulence very turbulent and affecting the normal classification. If the classification chamber is too large, the fractionation particles are not sufficiently affected by the centrifugal force, and slippage is liable to occur, and the fractional particles cannot be completely wound into the vortex. In addition, the shape of the grading chamber should also have a forward-flow guiding function, which is conducive to the passage of qualified fly ash fine powder into the impeller, and the unqualified coarse powder return grinding mill to be reground;
(3) Excellent precision seal structure
This is a key step to prevent the coarse particles of fly ash from being mixed into the inner surface of the impeller from the end face of the impeller. It can be designed as a special multi-layered labyrinth structure. Not only is there a lot of turns, the gap between the labyrinths is adjustable, and the blades at the entrance will also produce auxiliary centrifugal forces, prevent large particles from entering the labyrinth, sealing effect is excellent.
(4) Arrange the grading wheel in the best position
Another factor in achieving good grading is that the fly ash particles entering the grading zone must be fully dispersed, otherwise the grading wheel will disperse the agglomerated particles out of the wheel as large particles and regrind, which not only reduces the production of fine powder, but also increase the energy consumption of the mill. Therefore, the relative height difference between the grader and the milling machine in the milling zone is very important. The position of the grader should be selected in the area where the milling process of the mill is dispersed. Too close or too far to the classification is unfavorable.
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9th June 2018