COAL BASED THERMAL POWER PLANTS COAL MILLS FOR …
· Designers use large steel balls ranging from 2 to 6 or more between two grinding rings for pulverizing There are also other types like conical rollers with shallow bowl; deep bowl etc where load is applied on the rollers and the bowl rotates while pulverizing These types of mill are designed normally up to 60 tons per hour for a specific coal; however there are vertical mills with 90 tons