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Wet Flue Gas Desulfurization Systems Midwestern Case Study

Wet FGD 3D Unit 1 And 2 676 MW Babcock Wilcox

Wet Flue Gas Desulfurization Systems Units 1, 2 and 3 Midwestern

Midwestern U.S. Utility

The wet flue gas desulfurization (FGD) system from Babcock & Wilcox (B&W) features a combination of design components to provide a high level of reliability and removal efficiencies. These include B&W’s signature tray tower design that provides excellent 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

Project Summary

  • Engineering, procurement and construction 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
  • Project awarded: April 2004
  • Operational dates: December 2006, May 2007, and October 2007
  • Two additional B&W absorbers scrubbing a fourth boiler at the plant.

B&W Scope

  • Three wet FGD absorbers (1 per boiler)
  • Three limestone milling systems (1 system per boiler)
  • Gypsum dewatering system that includes four horizontal table filters (3 operating, 1 spare)
  • Construction of all B&W supplied equipment through Babcock & Wilcox Construction Co., Inc. (BWCC), a B&W subsidiary


The project met every engineering, fabrication and construction schedule milestone. The commissioned units have met performance guarantees.

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Wet FGD 3D Unit 3

Unit 3