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Coal power plants are based on one of three types of mills for coal pulverisation— ball-mill, ball-and race-mill, and ball-and tube-mill. In order to address the ... STATUS OF BIOMASS CO-FIRING IN COAL THERMAL POWER PLANTS IN DELHI NCR REGION_FINAL VERSION.indd 10 07/03/23 4:22 PM. 11 BOX 1: SAMARTH BY MINISTRY OF POWER