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      Filters        
                 
      4   Comparison between electrostatic precipitators and bag filters    
                 
          Parameters Pulsed air filter Electrostatic precipitator  
          Quantity of gas required No limit No limit  
          Dust concentration No limit No limit  
            Precautions in case of abrasive dust Collection devices and pre-  
              distribution of gas easy to combine  
          Gas temperature Critical for filter media <450 ° C  
            Possibility of clogging if close to the Critical if close to the dew point  
            dew point due to corrosion  
          Particle size Sensitive to fine particles Sensitive due to the increase of  
              resistivity, the cohesion of the particles  
              and reentrainment  
              Suppression of corona effect with  
              submicron particles  
          Resistivity of the dust No influence Very critical for the dimensioning  
          Specific collecting area Depends on the concentration and the Depends on the desired efficiency  
            pressure drop    
          Dewpoint Sensitive for some filter media Positive influence if high dew point  
          Acid dewpoint Sensitive for some filter media Positive influence if high dew point  
            Critical if close to the dew point Critical if close to the dew point  
            (clogging) (corrosion)  
          Clean air < 20 mg/m³ 20 - 50 mg/m³  
          Total pressure drop 120-200mmH2O 30-60mmH2O  
          Specific power 1 - 3,5 kW/(m³/s) with fan 0,1 - 2 kW/(m³/s) according the resistivity  
          Life of equipment 3-4 years for filter media 15-20 years  
            15 years for bag cages    
          Maintenance cost Higher Lower  
                 
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