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      Calculation of drying capacities for raw mills      
                   
      Date          
      Cement plant    
      Mill N°        
      Type
    (*)        
      (*) Birotator mill is a central discharge mill    
      (*) Airswept mill is a mill without outlet diaphragm and bucket elevator  
      (*) Monochamber mill is a mill with a grinding chamber and in some cases a drying chamber  
      (*) Compound mill is a mill with two grinding chambers  
      Mill diameter m        
      Drying chamber diameter m        
      Drying chamber length m (transfer diaphragm included)    
      Chamber 1 volume load %         
      Chamber 2 volume load % (0 if monochamber or airswept)  
      Lifting-classifying lining?
             
      Output t/h        
      False air at mill discharge %        
      Material components            
      name % % average moisture % maximum moisture      
     
         
     
         
     
         
     
         
      total: %H2O    
      Quantity of water in the feed   l/h    
      VENTILATION:        
      Existing (Main fan) m3/h         
      Reference temperature °C          
      Quantity in Nm3/h Nm3/h        
      Air speed in the mill (*) m/sec        
      (*) air speed in chamber 1 if birotator mill          
      (*) air speed in chamber 2 if compound mill          
      (*) Speed for available air quantity          
      Type of gas
             
      Gaz temperature °C        
      Ambient temperature °C        
      Residual moisture %        
      Tails temperature °C        
      Circulating load (Feed/Fines)        
      Fresh feed temperature °C        
      Total feed temperature °C         
      Mill outlet air temperature °C        
      Outlet material temperature °C        
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      RESULT FOR AVERAGE MOISTURE          
      Ventilation Nm3/h        
      Water vapor Nm3/h        
      Total Nm3/h        
      Capacity m3/h        
      If birotator m3/h (1m/sec for ch.2)      
      Total capacity m3/h        to °C    
      Is it enough presently?          
      Air speed m/sec        
      Is it too quick?        
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      RESULT FOR MAXIMUM MOISTURE          
      Ventilation Nm3/h        
      Water vapor Nm3/h        
      Total Nm3/h         
      Capacity m3/h        
      If birotator m3/h (1m/sec for ch.2)      
      Total capacity m3/h        to °C    
      Is it enough presently?          
      Air speed m/sec        
      Is it too quick?        
                   
      Maximum moisture acceptable with the present drying conditions %  
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      Moisture acceptable in the case of gas/air temperature increase and existing ventilation    
      New gas/air temperature °C        
      Acceptable moisture %        
     
     
      DRYING CHAMBER VOLUME            
      Volume m3        
      Capacity            
      For average moisture l/m3.h    
      For maximum moisture l/m3.h    
      If insufficient volume, volume to foresee          
      For average moisture m3 or length to foresee m  
      For maximum moisture m3 or length to foresee m  
                   
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