Research On Classification Characteristic Of The Turbo Air Classifier

The development history of the turbo air classifiers was reviewed at first. Then many types of classifiers in the world were introduced, and some problems of the turbo air classifiers were pointed out.The structure and the principle of the turbo air classifier were also presented in the thesis. The emphasis included the structure, the improvement and the characteristic of the turbo air classifier.By the research of airflow velocity and the rotate speed of the classifying wheel, the conclusion was drawn. It was that with the rotate speed increasing, the granularity diameter would be fine, and the classification efficiency would increase first and then decrease. With the airflow velocity rising, the granularity diameter would turn course. The classification efficiency would increase first and then decrease.By analyzing the testing data, it showed that the equipment for different material would be different; and the effect of the same parameters to different material is different. So the structure design would be adjusted according to the material characteristic.Deducing from the theory, it could draw a conclusion which is the same with the test result. The all-purpose CFD code is used to simulate it numerically. When the rotate speed increases to certain extent, the countercurrent phenomenon of the particles appears. The separated granules come back to the classification district and influence the classification efficiency.