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    Coal Grinding Technology (4th Part)            
                       
    13   Graphics - Drying capacities            
        Here below are three charts summarizing the drying needs with the following conditions:      
        Observation: Weber and Heat Balance methods are used to make the graphs        
        - Airswept mills            
        - Mill's diameters: 2,5-3-3,5-4m            
        - Ratio Length/Diameter: 2,4            
        - Ratio Length drying chamber/Diameter: 0,6            
        - Filling degree: 28%            
        - Percentage of the critical speed: from 77% (2,5m) to 74% (4m)          
        - False air at mill discharge: 10%            
        - Composition: 100% bituminous coal            
        - Coal moisture: 6%            
        - Kiln gas             
        - Ambient temperature: 20°C            
        - Residual moisture: 1,5%            
        - Circulating load (A/F): 3            
        - Fresh feed temperature: 20°C            
        - Mill outlet air temperature: 75°C            
        - Outlet material temperature: 80°C            
        - Tails temperature: 70°C            
                       
      13.1 Gas Quantities Nm3/kg of coal in function of the inlet gas temperature:          
                       
      13.2 Gas Quantities in m3/h in function of the inlet gas temperature:          
                       
                       
      13.3 Speed Quantities in m/sec in function of the inlet gas temperature:          
                       
                       
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