The Boilers In Toplofikatsia Ruse Are Equipped With Mill Systems With An Intermediate Dust Hopper. Grinding Of The Fuel - Coal Takes Place In Drum - Ball Mills Using Grinding Bodies - Balls. General Requirements Material - Steel. Production Method – Forged, Stamped, Rolled. Size – Ø 60 Mm, Limit Deviations “+3”, “-2” Mm. 2. Technical Requirements. The Steel Balls Are Produced In Accordance With The Requirements Of Standard Bds 2798-84. The Steel Balls Shall Be Of Carbon Steel With The Following Chemical Composition: C 0.7÷0.85 Mn 0.7÷1.2 Si 0.3÷0.5 P To 0.035 S To 0.035 Cr 0.3÷0.45 Mo 0.1÷0.3 Hardness – The Hardness Of The Balls After Heat Treatment Should Be Hrc/Hb –56÷58/ 578÷624 Across The Entire Cross-Section Of The Bodies No Defects Are Allowed On The Surface Of The Balls, Which Take The Dimensions Outside The Limit Deviations Specified In The General Requirements Fragility - No Higher Than 1%.
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