Wet scrubbers

Wet Scrubber - Flue Gas Desulfurization (FGD)

Wet Scrubber

B&W’s proven technology, flexibility of design options and advanced features of our wet flue gas desulfurization (FGD) systems help to reduce emissions in new or retrofit applications.

Our wet FGD systems, or wet scrubbers, have operated efficiently, economically and reliably since 1971.

Current designs can achieve more than 99% SO2 removal, with system availability greater than 99.5%. Our absorber design also provides reduced operating and maintenance costs.

As a multi-pollutant control device, B&W’s wet scrubbers also help control filterable (solid) particulate, acid mist and mercury.

Features and benefits include:

  • Forced or inhibited oxidation – provide options for selling gypsum byproduct or eliminating wastewater discharge
  • Single or dual tray designs – promotes gas/liquid contact and uniform gas distribution for improved emissions reduction
  • Large, single absorber capability to treat multiple boilers – smaller plant footprint and reduced operating costs
  • Choice of reagents – provides flexibility
  • Interspatial spray headers – more effective overlapping spray coverage for shorter absorber towers, reduced pump power, lower building height, less external recirculation piping, and easier nozzle inspection and maintenance
  • Moisture separators – rugged and effective design helps prevent slurry carryover

In addition to flue gas absorbers, we supply complete systems, including reagent preparation, dewatering and related system equipment. Our wet FGD experts provide design and engineering as well as start-up, commissioning and support services.

Applicable boiler sizes:

  • 50 MW to 1300 MW

Removal efficiencies:

  • Up to 99%


  • Primarily limestone; also lime, magnesium-enhanced lime, sodium carbonate, and ammonia.


  • All solid fuels — primarily coal.

Request a Quote

For all of your Wet FGD needs, including:

  • New Equipment
  • Upgrades
  • Service
  • Replacement Parts

Success Stories

American Electric Power - West Virginia, USA

Mitchell Station Units 1 and 2
EPC of wet FGD systems, ESP, SCR and trona injection system for two 800 MW units

First Energy W.H. Sammis Plant – Ohio, USA

B&W W.H. Sammis Plant Environmental Retrofits
EPC of SCR and wet FGD systems earn plant “Construction Project of the Year” honor

Detroit Edison, Monroe Units 1 Through 4

Monroe Units 1, 2, 3 and 4
Wet flue gas desulfurization (FGD) systems installed for SO2 removal on four 825 MW PRB-firing units

FirstEnergy’s Fort Martin Station – West Virginia, USA

B&W Fort Martin Units 1 and 2 Project
Two delivered and constructed wet FGD systems remove 98% of entering SO2

Progress Energy Asheville Station – North Carolina, USA

Asheville Station Units 1 and 2
Award-winning project to supply two wet FGD systems for PC-firing units

Hatfield Ferry Station – Pennsylvania, USA     

B&W Hatfield’s Ferry Station Units 1, 2 and 3 Project
Design and erection of wet FGD systems, with module fabrication to bypass transportation constraints