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      Heat balance of the cement mill      
      Calculation of the water injection required        
                     
      Date          
      Company      
      Cement plant    
      Mill N°        
      Technical data of the mill            
      Type of circuit (0 if open circuit, 1 if closed circuit)  
      Mill diameter m        
      Total length of the shell m        
      Usefull length 1st chamber m        
      Ball charge in chamber 1 tons          or volume load  
      Usefull length 2nd chamber m         
      Ball charge in chamber 2 tons          or volume load  
      Absorbed power kW        
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      Production data of the mill            
      Output t/h        
      Circulating factor (Feed/Fines) (1 if open circuit)      
      T°ambient air °C        
      % false air after mill % (normally used: 15%)  
      T°water °C        
      Cement temperature  °C (at mill outlet)    
      Air temperature at mill outlet °C        
      Components % total % H2O Temp.°C        
      clinker        
      gypsum        
               
               
               
      Total            
      Feed moisture content %H2O        
      Water in the feed l/h        
      Feed temperature °C        
      Ventilation available m3/h         
      Actual ventilation inside mill m3/h   or m/sec  
      Separator tails temperature °C        
      Heat balance calculation            
      Heat IN (Kcal) grinding        
          material        
          air        
          water        
          total        
      Heat OUT (Kcal) shell        
          cement        
          air        
          water        
          total Correlation      
      Difference (Kcal)   (*)    
      Water injection required total l/h      
          chamber 1 l/h      
          chamber 2 l/h      
      (*) If the correlation is lower than 97-98%, it can mean that:          
       - Moisture of alimentation is too high            
       - Ventilation is too high              
       - Temperature of rejects is too low            
      Hyphothesis:              
      Efficiency of energy:   0,85          
      Cp cement (Kcal/kg °c)   0,19          
      Cp water (Kcal/kg °c)   0,44          
      Cp air (Kcal/Nm3 °c)   0,31          
      Dissip shell (Kcal/m2)   760          
      Vap/ Kg H2O at 100°c in Kcal 537          
      1 KWh = 3600 KJ = 860 Kcal   860          
                     
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    All rights reserved © 2012-2015 The Cement Grinding Office