Dust-purification-techniques

Dry Electro filter

Figure : Dry electro filter (source: http://www.epa.gov/air/oaqps/eog/course422/ce6a1.html)

The advantages of dry Electro filter are:

• Very high capture output are reached, even above 99%

• Very small particles can be well caught using electro filter. There is no theoretical limitations to the particle size

• Generally dry dust can be broken away from, this offers the possibility for reuse of the broken away from dust

• Electro filters are suitable for treating very large gas flows, whereas also high temperatures can be allowed

• Application of special material can be made the electro filter
  arranged for very corrosive gas flows

• The output of electro filters is possible building of several fields
  or areas are later raised

• Low pressure drops: 0.05 - 0.3 kPa

The disadvantages of dry Electro filter are: 

• Electro filters generally less suited for processes with variable company circumstances concerning the offered dust concentration. This objection can be caught partially by automatic tension regulation. Variable company circumstances is no problem, if the installation has been devised for the most serious situation

• There less has suited for the disposal of dust with a very high or very low electric capacitance

• Particles with in proportion to the mass has a large surface can be removed difficulty because these are taken away by the turbulent gas flows 

• The difficult to separate dust can produce a problem concerning the size of the gas flows and required the efficiency the spatial occupation 

• Sensitive for maintenance

• Explosion danger at flammable dust (for example sooth)

The main application areas are power plants and waste combustion installations.

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