BigPatents India

A bowl mill for a coal pulverizer with an air mill for primary entry of air comprises a generally closed separator body (2) with a central axis and a bowl-like grinding table (3) mounted on a shaft (4) rotatable about the central axis. The grinding table (3) cooperates with a plurality of grinding rolls (6). The air mill is provided with multiple entry annular openings (17â
™,17â,18â™,21, 25) on its outer wall for multiple entry of hot primary air from the inlets (17,18,19) resulting in better uniformity in air flow around the air mill section and for minimizing formation of eddies and vortices.