The Wet Electrostatic Precipitator removes dust and/or aerosol in wet conditions. WESP separates particles and aerosols from the raw gas stream. This is done by charging the aerosol droplets in an electric field and by deposing them on the surface of the collector tubes. The discharged sulfuric acid droplets run downwards to the sump of the filter.

The air stream enters the precipitator from the bottom and passes a pre-filter section, where large aerosol droplets are separated. A further function of the prefilter bed is to straighten the flow of the gas stream before entering the precipitator tubes.

This is essential to optimize the flow conditions inside the collector tubes in order to achieve a high cleaning efficiency.

Aerosol Electrostatic precipitation
Flowing through the collector tubes at low velocity, the aerosols are charged negatively by the corona of the discharge electrodes, which hang coaxially within the tubes. The charged aerosols move to the positively charged collector tubes, where they are precipitated and thus separated from the gas. The precipitated acid forms a liquid film and flows downwards to the bottom of the filter, whereas the clean tail gas leaves the filter from the top.

Key Advantages

  • No continuous liquid film required
  • The control system provides self-regulation of the discharges ensuring much higher availability, lifetime, and low maintenance costs
  • Separated fluids can be recycled into the process
  • No cooling water needed
  • The casing is made of corrosion resistant synthetic material

Typical application

  • Coal industry
  • Oil industry
  • Petcoke industry
  • Chemical waste, in sulfuric acid plants
  • Metallurgical sulfuric acid plants
  • Regeneration of spent sulfuric acid