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      Grinding technology of limestone with ball mills
             
      7. Ventilation (part 2):    
             
      7.9. Calculation of the necessary ventilation:
      If: diameter = D in m    
      volume load = J in %    
      lining thickness = e in mm  
      air speed = v in m/sec    
      false air = f in %    
      Q = quantity of air in m3/h  
       
     
       
      we have:      
             
      Example:      
      D = 4.2m      
      e = 80mm      
      j = 33%      
      f = 10%      
      we want v = 1.5 m/sec     
      => Q = 51 107 m3/h (we will choose a fan of 55 000 m3/h)
      7.10. Calculation of the fan:  
      In the example hereabove, we need a fan of 55 000 m3/h.
      But the supplier needs also to know the pressure drops in the circuit to size the fan.
      The following figures must be taken into consideration:
      - For the mill, to see before  
      - static separator: ± 100 mmWG  
      - cyclone: ± 80 mmWG    
      - bag filter: ± 150 mmWG    
      - electroprecipitator: ± 40 mmWG  
      - dynamic pressure: ± 20 mmWG  
      - ducts: ± 80 mmWG    
      Example:      
      For the mill here above, equiped with a static separator, a cyclone and a bag filter, we foresee:
      200mm pressure drop for the mill,  
      Total pressure drop = (mill + static + cyclone + dynamic + ducts + bag filter)
      Then, 200 + 100 + 80 + 20 + 80 + 150 = 630 mmWG available to the fan.
             
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