Lansing Generating Station, Unit 4

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: 2012

Commercial Operation: 2015

B&W Project Description

Babcock & Wilcox (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.