Electrostatic Precipitator

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Electrostatic Precipitator

  1. 1. A STUDY ABOUT “ELECTROSTATIC PRECIPITATOR” By, NINAD BAB ARAO GHORMADE
  2. 2.  Introduction :- An electrostatic precipitator is a large, industrial emission-control unit. It is designed to trap and remove dust particles from the exhaust gas stream of an industrial process. Precipitators are used in these industries:  Power/Electric  Cement  Chemicals  Metals  Paper
  3. 3.  Invention :- The first use of corona discharge to remove particles from an aerosol was by Hohlfeld in 1824. However, it was not commercialized until almost a century later. In 1907 Dr. Frederick G. Cottrell.
  4. 4. Boiler Chimney
  5. 5. Boiler Electrostatic Precipitator Chimney
  6. 6.  Construction :-  A. Collecting Plates
  7. 7.  B. Discharge Electrodes
  8. 8.  C. Rappers
  9. 9.  D. Hoppers
  10. 10. Fig: Constructional Diagram
  11. 11.  Principle :- Electrostatic precipitation removes particles from the exhaust gas stream of an industrial process. Often the process involves combustion, but it can be any industrial process that would otherwise emit particles to the atmosphere. Six activities typically take place:
  12. 12.  Advantages of electrostatic precipitator:-  This is more effective to remove very small particles like smoke, mist and fly ash. Its range of dust removal is sufficiently large (0.01 micron to 1.00 micron). The small dust particles below 10 microns cannot be removed with the help of mechanical separators and wet scrubbers cannot be used if sufficient water is now available. Under these circumstances, this type is very effective.  This is also most effective for high dust loaded gas (as high as 100 grams per cu. meter)  The draught loss of this system is the least of all forms(1 cm of water)  It provides ease of operation.  The dust is collected in dry form and can be removed either dry or wet.
  13. 13.  Disadvantages of a electrostatic precipitator  The direct current is not available with the modern plants, therefore considerable electrical equipment is necessary to convert low voltage (400 V) A.C to high voltage (60000 V) D.C. This increases the capital cost of the equipment as high as 40 to 60 cents per 1000 kg of rated installed steam generating capacity.  The running charges are also considerably high as the amount of power required for charging is considerably large.  The space required is larger than the wet system.  The efficiency of the collector is not maintained if the gas velocity exceeds that for which the plant is designed. The dust carried with the gases increases with an increase of gas velocity.
  14. 14.  Conlusion :- Electrostatic precipitators have been a reliable technology since the early 1900's. They were originally developed to stop serious smoke and air issues and have definitely helped the environment. Today electrostatic precipitators are found mainly on large power plants, cement plants, incinerators, and various boiler applications.
  15. 15.  Reference :-  http://www.neundorfer.com/electrostatic_precipitators  http://web.njit.edu/electrostaticprecipitator  http://en.wikipedia.org/Electrostatic_precipitator  http://www.thermaxindia.com/electrostatic-precipitators
  16. 16. THANK YOU

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