Rotary Classifier Constricting Section for Coal Distribution

The classifier interior space is segmented into multiple regions by providing both upper and lower constriction sections. The lower constriction section divides the space into first and second regions, while the upper constriction section further divides them into sub-regions. This segmentation allows independent control of powder flow distribution in different areas, achieving even distribution throughout the entire classifier.

The solution extends from a single-dimensional (upper side only) obstruction approach to a multi-dimensional approach by adding constriction sections at both upper and lower sides of the classifier. This spatial extension in the vertical dimension enables comprehensive control of powder flow paths throughout the classifier height, achieving uniform distribution that was impossible with upper-side obstruction alone.

The classification blades are segmented into upper and lower halves with different sweptback angles to optimize classification precision for different particle sizes. Meanwhile, the constriction sections are designed as separate, standardized components that can be independently manufactured and assembled, improving overall assemblability while maintaining classification precision.

Different sweptback angles are applied locally to different portions of the classification blades - the upper half has one angle optimized for finer particles while the lower half has another angle for coarser particles. This local differentiation achieves high classification precision without requiring the entire blade assembly to be custom-made, thus improving manufacturability.