Particulate Control

Wet Electrostatic Precipitators

Wheelabrator Particulate Control Wet Electrostatic Precipitator


  • High degree of customization to meet customer needs
  • Removal of fine particles and acid mist
  • Durable and long lasting alloy construction
  • Full penthouse/insulator enclosure for ease of maintenance
  • Intermittent spray washing capability as secondary means of cleaning
  • Continued support training, startup, tuning, inspections and more

Wet Electrostatic Precipitators (WESP) are polishing devices to remove fine particles and condensed aerosols such as sulfuric acid mist. Our Wet ESP technology dates back to the 1970’s with first installations on coal tar units.  We have since built upon this technology with our acquisition of Croll-Reynolds Clean Air Technologies.

We offer both a horizontal flow design for large utility and industrial applications and a vertical flow modular design for smaller applications.

Our reference list includes 70+ industrial units and 2.6 GWe of utility boilers including 2 installations on 800 MWe coal-fired boilers

We have supplied over 70 industrial Wet Electrostatic Precipitators.


  • Utility Boilers 2.6 GWe
  • Chemical & Plastics (haz waste, incinerator, plastics manufacturing)
  • Electronics (fiber optic, semiconductor)
  • Food Process (corn, chicken, grappa, peanut roast)
  • Metals & Mining (ore roasting, steel recovery, phosphate production)
  • Used for removal of:
    Solid particles:  PM2.5 into sub-micron range
    Aerosols:  H2O, H2SO4, condensed organics
    Metals:  SVM, LVM, particulate Hg
  • Does not collect:
    Acid gases:  SO2, HCl, HF
    VOC:  non-condensed organics
    Metallic vapors:  non-condensed inorganics

  • Last air pollution control device – “polishing device”
  • Saturated flue gas environment, temperature < 150°F (65°C)

Wheelabrator Horizontal Irrigated Plate Wet Electrostatic Precipitator Diagram

HIPWESP (Horizontal Irrigated Plate WESP)

  • Horizontal gas flow for wide range of gas volumes
  • Multiple electrical sectionalization for high removal capability
  • Continuous collecting plate irrigation provides superior performance to spray cleaning designs
  • Intermittent spray washing for corrosion protection of wetted equip
  • Vertical, shop assembled collecting curtains. Alloy construction.
  • 2 or 4 pt high voltage suspension
  • Rigid discharge electrodes for increased performance and enhanced reliability
  • Full penthouse/insulator encl.
  • Access at top and bottom of fields

Condensing Wet Electrostatic Precipitators

Condensing WESP

  • Vertical gas flow for small footprint
  • Superior performance to spray cleaning designs due to continuous plate irrigation via condensation
  • Intermittent spray washing capability as secondary means of cleaning
  • Modular construction for ease of installation. Rectangular or round.
  • Round tubes for symmetrical electrical field
  • 4 pt high voltage suspension
  • Rigid discharge electrodes for increased performance and reliability
  • Multiple electrical fields possible
  • Pre-conditioning via water sprays or scrubbing

How it Works


Wet Electrostatic Precipitator Theory Flow chart

Step 1: Charging
  • Gas ions formed by corona discharge
  • Particulate charged by gas ions

Step 2: Collection
  • Ions transport particles to collect plate
  • Particulate charge given to collect plate

Step 3: Cleaning
  • Particulate trapped in liquid film
  • Collecting plate continuously irrigated

Special Features

Wet Electrostatic Precipitators Rigid Discharge Electrode closeup

Rigid Discharge Electrode (RDE)
  • Virtually unbreakable design – superior to wire-type designs in performance and reliability
  • Sharp pointed corona generators to combat current suppression

Wet Electrostatic Precipitator special collection plate

Continuous Irrigation and Collecting System
  • Special collection plate design promotes complete water coverage along height of collecting curtain
  • No particulate buildup allows for maximum amount of power input into the WESP = enhanced performance and smaller WESP

Wet Electrostatic Precipitators diagram of enclosure

Full penthouse/insulator enclosure for easy access and maintenance

Recent Projects

Wet Electrostatic Precipitator Peabody Prairie state

Peabody Prairie State

Location: Lively Grove, IL, USA
Customer: Prairie State Energy
Design: 2 x Plate Horizontal Flow
Capacity: 2 x 800 MWe
Start-Up Year: 2011
Fuel: Bituminous Coal
Gas Flow: 2 x 2,265,000 ACFM
(2 x 3,848,259 m3/hr)unt.

Wet Electrostatic Precipitator built in City of Springfield Dallman

City of Springfield Dallman

Location: Springfield, IL, USA
Customer: City of Springfield
Design: Plate Horizontal Flow
Capacity: 200 MWe
Start-Up Year: 2009
Fuel: Bituminous Coal
Gas Flow: 640,000 ACFM
(1,087,366 m3/hr)

PCS Phosphate Wet Electrostatic Precipitators in Aurora NC

PCS Phosphate Aurora

Location: Aurora, NC, USA
Customer: PCS Phosphate
Design: Tubular Vertical Flow
Start-Up Year: 2001-2003
Gas Source: Phosphate Calciners
Gas Flow: 6 x 71,600 ACFM
(6 x 122,000 m3/hr)

Wet Electrostatic Precipitator built for LG&E in Trimble Kentucky

LG&E Trimble County 2

Location: Trimble County, KY, USA
Customer: LG&E
Design: Plate Horizontal Flow
Capacity: 750 MWe
Start-Up Year: 2010
Fuel: Bituminous,
Sub-Bituminous Coal
Gas Flow: 2,100,000 ACFM
(3,567,922 m3/hr)

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