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  CALCULATION OF DRYING CAPACITIES FOR AIRSWEPT COAL MILL (by the heat balance)  
  Date          
  Cement plant      
  Coal Mill N°          
  System
         
  Mill Diameter m        
  Mill Length m        
  Mill surface area m2        
  Drying chamber diameter m        
  Drying chamber length m (transfer diaphragm included)    
  Chamber volume load %        
  Mill absorbed power kW        
  Output t/h        
  Specific power consumption kWh/t        
  False air at mill discharge %        
  Composition of the alimentation (Type of coal):          
 
%        
 
%        
  Total          
  Total coal Moisture %        
  Corresponding to  l/h        
  VENTILATION:            
  Coal main fan m3/h        
  Reference temperature °C        
  Type of gas
         
  Gaz temperature °C        
  Ambient temperature °C        
  Residual moisture %        
  Circulating load (Feed/Fines)      
  Fresh feed temperature °C        
  Total feed temperature °C        
  Mill outlet air temperature °C        
  Outlet material temperature °C        
  Tails temperature °C        
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  Required gas quantity for drying m3/h        
  Quantity in Nm3/h Nm3/h        
  HEAT BALANCE:            
               
  IN - Grinding Kcal        
  IN - Material Kcal        
  IN - Gas Kcal        
  IN - Water Kcal        
  IN - Total Kcal        
  OUT - Shell Kcal        
  OUT - Material Kcal        
  OUT- Gas Kcal        
  OUT - Water + Vapour Kcal        
  OUT - Total Kcal        
  Difference IN - OUT Kcal        
  Correlation (*) %        
  (*) Correlation must be higher than 99%          
               
  RESULTS:            
  Ventilation Nm3/h        
  Water vapor Nm3/h        
  Total Nm3/h        
  Total Capacity m3/h        
 
  Important comments:      
  Is it enough presently? (If no, increase hot gas temperature if possible)    
  Air speed (*) m/sec        
  Is it too quick?      
  Is it OK for pneumatic transport?    
  DRYING CHAMBER VOLUME            
  Volume m3        
  Capacity            
  Corresponding to l/m3.h    
               
  If insufficient volume, volume to foresee          
  For present moisture m3 or length to foresee m  
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All rights reserved © 2012-2015 The Cement Grinding Office