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      Heat balance of the cement mill      
      (Calculation of the cement temperature at mill outlet)        
                     
      Date            
      Company    
      Cement plant    
      Mill N°          
                     
      Technical data of the mill            
      Type of circuit  
             
      Mill diameter   m        
      Total length of the shell m     Open   
      Usefull length 1st chamber m     Closed  
      Ball charge in chamber 1 tons          or volume load  
      Usefull length 2nd chamber m         
      Ball charge in chamber 2 tons          or volume load  
      Speed of rotation   rpm          or %Vcr    
      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        
      Water injection chamber 1 l/h        
        chamber 2 l/h        
        total l/h        
      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        
      (*) This is the air quantity in the dust after mill outlet and going to the filter    
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      Heat balance calculation            
      Heat IN (Kcal)   grinding        
          material        
          air        
          water        
          total        
      Heat OUT (Kcal)   shell        
          cement        
          air        
          water        
          total Correlation      
      Difference (Kcal)        Iteration!  
      Cement temperature at mill outlet   °C      
      Type the cement temperature at mill outlet °C (up to get the right correlation > 0,99)  
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      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