Roxboro Station Units 1 - 4
Wet Flue Gas Desulfurization Systems

Progress Energy
Roxboro, North Carolina

Babcock & Wilcox (B&W) wet flue gas desulfurization (FGD) systems feature a combination of design components to provide a high level of reliability and removal efficiencies. These include B&W’s signature tray tower design to provide superior gas to liquid contact and uniform flow distribution through the absorber spray zones; its patented inlet awning, interspatial headers to reduce absorber height, pump power requirements, and internal support costs; forced oxidation system; and advanced mist eliminators.

Boiler/Plant Information

  • 3 x 700 MW (Units 2, 3 and 4),
  • 1 x 400 MW (Unit 1)
  • Boiler type: Pulverized coal fired
  • Design fuel: Bituminous
  • Additional environmental equipment: Electrostatic precipitator, selective catalytic reduction system, and waste water treatment system

Project Summary

  • Engineering, procurement and commissioning of a wet flue gas desulfurization system
  • System designed to remove 97% of the entering SO2 without organic acid addition
  • Type: Limestone forced oxidation with gypsum byproduct
  • Commercial operation:
    - April 2007 (Unit 2),
    - December 2007 (Unit 4),
    - May 2008 (Unit 3),
    - December 2008 (Unit 1)

B&W Scope

  • Four wet FGD absorbers – functional design by B&W, supply by Stebbins
  • Three limestone ball mill systems (2 operating, 1 spare)
  • Four vacuum filter systems (3 operating, 1 spare)


The project met engineering, fabrication and delivery objectives. 

New Build

We consistently demonstrate the ability to successfully execute innovative solutions for our customers, from new equipment to large, complex full-scope engineering and construction projects.

Upgrades / Retrofits

Modifying, improving and maintaining existing equipment are vital considerations for the long-term viability and profitability of all operations.

Parts / Services

An extensive network of worldwide regional service centers, field service engineers and technical support personnel are available to provide the customized service and aftermarket solutions for your requirements.