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      CALCULATION OF DRYING CAPACITIES FOR RAW MILL (by the heat balance)    
      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          
      Mill Length m          
      Mill surface area m2          
      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?
               
      Mill absorbed power kW          
      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          
      (*) mainly the kiln fan              
      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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        For average moisture     For maximum moisture      
      Required gas quantity for drying m3/h   m3/h    
      Quantity in Nm3/h Nm3/h   Nm3/h    
      HEAT BALANCE:              
        For average moisture     For maximum moisture      
      IN - Grinding Kcal   Kcal    
      IN - Material Kcal   Kcal    
      IN - Gas Kcal   Kcal    
      IN - Water Kcal   Kcal    
      IN - Total Kcal   Kcal    
      OUT - Shell Kcal   Kcal    
      OUT - Material Kcal   Kcal    
      OUT- Gas Kcal   Kcal    
      OUT - Water + Vapour Kcal   Kcal    
      OUT - Total Kcal   Kcal    
      Difference IN - OUT Kcal   Kcal    
      Correlation (*) %   %    
      (*) Correlation must be higher than 99%            
      RESULTS:              
        For average moisture     For maximum moisture      
      Ventilation Nm3/h   Nm3/h    
      Water vapor Nm3/h   Nm3/h    
      Total Nm3/h    Nm3/h    
      Capacity m3/h   m3/h    
      If birotator, for chamber 2 (*) m3/h   m3/h    
      Total capacity m3/h     m3/h     
      (*) If it is a birotator mill, the air speed in the second chamber will be 1 m/sec         
      (*) There isn't hot gas in the second chamber          
      Is it enough presently?          
      Air speed (*) m/sec   m/sec    
      Is it too quick?      
      (*) air speed in chamber 1 if birotator mill            
      (*) air speed in chamber 2 if compound mill            
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      Maximum moisture acceptable with the present drying conditions %   ---> see correlation (*) %  
      (*) Correlation must be higher than 99%            
      Moisture acceptable in the case of gas/air temperature increase and existing ventilation      
      New gas/air temperature °C          
      Acceptable moisture %       ----------------------------> see correlation (*) %  
      (*) Correlation must be higher than 99%            
     
     
      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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