Dürr Megtec LLC

Lansing Generating Station, Unit 4 - Case study


Courtesy of Dürr Megtec LLC

Alliant Energy
Lansing, Iowa, USA

Plant Description
Pre-retrofit equipment

  • 270 MW boiler
  • Hot-side electrostatic precipitator (ESP)
  • Selective catalytic reduction (SCR)
  • Powdered activated carbon (PAC)
  • Fabric filter

Contract Order

Commercial Operation

B&W Project Description
The Babcock & Wilcox Company (B&W) integrated a circulating dry scrubber (CDS) system upstream of an existing fabric filter to control SO2, H2SO4, HCl, HF, mercury, and particulate matter emissions. The CDS system was designed to control emissions from burning either Powder River Basin (PRB) coal alone or with a blend of bituminous coal, achieving SO2 removal efficiency up to 98%.

The new CDS system was integrated into the existing flue work structure in approximately 6 months, while Babcock & Wilcox Construction Co., Inc., a subsidiary of B&W, completed the tie-in outage in less than 6 weeks. After approximately 3 months of operation, the system was performance tested and passed all guarantees (emissions and consumables) and completed the reliability demonstration shortly thereafter.


  • Design, supply, erection, training and commissioning
  • Circulating dry scrubber; 6 venturi design
  • Byproduct solids recirculation system; 6 solids injection locations (below the venturis)
  • Hydrated lime feed system
  • Humidification water system; 6 water injection lances (above the venturis)
  • Gas recirculation system
  • Fabric filter upgrades
  • Byproduct handling equipment

B&W CDS Technology Benefits

  • B&W optimizes its circulating dry scrubber design for each application. This approach provides the end user with an optimized system to reduce long-term
  • power and lime consumption, while providing reliable operation across wide load and fuel ranges. Plant owners benefit from lower operation and maintenance costs.

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