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Electrostatic precipitators

An electrostatic precipitator is a filtration device that removes fine particles, like dust and smoke, from a flowing gas using the force of an induced electrostatic charge minimally impeding the flow of gases through the unit. Electrostatic precipitator are more economic because of less energy consumption and less maintenance requirements. Electrostatic precipitators are used at:

  • steel, iron industry
  • metal production plants
  • chemical Industry
  • viscose industry
  • Cement, gypsum industry (furnace, mills, dryers)
  • Power plants
  • Coal dryers and coal mills
  • Waste incinerating plants
  • Gas plants

P&P offers electrostatic precipitators in two different versions

  • Wet Electrostatic precipitators (WESP)
  • application with Aerosols
  • P&P is using special materials and honeycomb or round tubes
  • Dry electrostatic precipitators ( for example -> high temperature applications)
  • Material carbon steel in several versions vertical & horizontal

Benefits electrostatic precipitator vs. other technologies:

  • Filtering fine dust >=0.1 μm!!!!
  • Also fits for high temperatures (~300°C long term usage, ~600°C short time duty)
  • less energy consumption (significant less pressure losses, no additive vents)
  • no compressed air system for cleaning necessary (outside-temperatures below 0°C possible)
  • significant less service time (only cleaning, 1x control inspection/year)
  • no additive noise

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Precipitator performance is very sensitive to two particulate properties:

  1. Electrical resistivity;
  2. Particle size distribution.

These properties can be measured economically and accurately in the laboratory, using standard tests. Resistivity can be determined as a function of temperature in accordance with IEEE Standard 548. This test is conducted in an air environment containing a specified moisture concentration. The test is run as a function of ascending or descending temperature, or both. Data is acquired using an average ash layer [further explanation needed] electric field of 4 kV/cm. Since relatively low applied voltage is used and no sulphuric acid vapour is present in the test environment, the values obtained indicate the maximum ash resistivity.

In an ESP, where particle charging and discharging are key functions, resistivity is an important factor that significantly affects collection efficiency. While resistivity is an important phenomenon in the inter-electrode region where most particle charging takes place, it has a particularly important effect on the dust layer at the collection electrode where discharging occurs. Particles that exhibit high resistivity are difficult to charge. But once charged, they do not readily give up their acquired charge on arrival at the collection electrode. On the other hand, particles with low resistivity easily become charged and readily release their charge to the grounded collection plate. Both extremes in resistivity impede the efficient functioning of ESPs. ESPs work best under normal resistivity conditions.

Resistivity, which is a characteristic of particles in an electric field, is a measure of a particle's resistance to transferring charge (both accepting and giving up charges). Resistivity is a function of a particle's chemical composition as well as flue gas operating conditions such as temperature and moisture. Particles can have high, moderate (normal), or low resistivity.

 

 

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Electrostatic Filters

  • Electrostatic Filter Wet Process (Honeycombs or tubes)
  • Electrostatic Filter Dry Process (for high temperatures < 600°C)

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