Air Classifier | RHEWUM AWR
Our air classifier type AWR makes it possible to grade your bulk solids at high efficiencies
At outputs of up to 30 t/h the air classifier provides flexibility for a wide range of feed material such as cement, fly ash, raw mix, gypsum, quartz, coal, cellulose, pigments and colorants, silica, sodium bicarbonate, varnish, zirconium oxide, potato starch, flour, calcium carbonate, graphite, bentonite, china clay, talcum, refractories, rare earths, wax, PVC, toner and many more.
The air classifier handles a high specific feed rate and has low energy consumption. It provides a sharp separation and high wear resistance because it was developed for the separation of quartzite. The low maintenance design ensures long term, trouble free performance.
Function of the air classifier
The material is fed pneumatically from the bottom of the air classifier. Dispersion of the material by the fast rotating wheel is guaranteed. The velocity of the rotor sends the product to the outside wall where agglomerates ase disintegrated and the dispersed material falls down.
The falling material is tangentially flown through by an air stream. Due to the physical relation between centrifugal force, gravity and flow force, the lightweight particles are transported into the rotor. Heavy and large particles are not transported by the air stream and fall down into the cone for cor coarse material.
Design and plant layout
RHEWUM air classifiers are characterized by a smooth start due to a frequency converter. Moreover, custom made protective wear linings ensure the long-life cycle of the air classifier.
By implementing an air classifier in an existing screening unit, the capacity can be increased significantly because fine material is separated before the screening process. The installation of such a compact air classifier can be realized in every screening unit. Such plants can be differentiated into units with cyclones and units with filters.
Standard for the removal of fines from an air stream is the use of a cyclone with a fan. The fines are separated from the sifting air in the cyclone by means of centrifugal force. The dedusted air is fed back to the air classifier as working fluid in a closed circuit. The residual content of dust in the clean gas adds up to max 5%. This standard design requires low maintenance.
Alternatively, the air classifier can be operated with a filter, e.g. if the product has to be cooled in the same step. With the use of a filter, nearly 100% of the fines are separated. The clean gas of the filter fulfills every standard for limit values of emissions and can be emitted to the atmosphere if required. Furthermore, it is possible to adjust the temperature of the fines by the addition of fresh air.