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Wet Flue Gas Desulfurization Systems Midwestern Case Study

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

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

3 x 676 MW Boiler type: Pulverized coal fired Design fuel: Bituminous Additional environmental equipment: Electrostatic precipitator (ESP) and selective catalytic reduction (SCR) system

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

Results

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