SO2 Scrubber Repairs & Upgrades

Sulfur dioxide (SO₂) scrubbers — more formally called flue gas desulfurization (FGD) systems — are among the most complex and maintenance-intensive pollution control systems in coal-fired power generation. These systems handle highly corrosive limestone and gypsum slurries at elevated temperatures, making materials degradation a constant challenge. Unplanned FGD failures can force unit derate or shutdown and expose owners to regulatory penalties for emissions exceedances. MAC Industrial Services provides the repair and maintenance services to keep FGD systems performing reliably.

The absorber tower is the heart of a wet FGD system — and the primary site of degradation. Tower internals including mist eliminator modules, spray header systems, oxidation air distribution headers, agitator mechanical systems, and the rubber or alloy lining systems that protect the steel shell all require regular inspection and maintenance. MAC crews work within absorber towers during outages to replace damaged mist eliminator modules, repair spray nozzle headers, patch or replace deteriorated liner systems, and perform structural repairs to the tower shell and support structure.

Beyond the absorber, MAC provides maintenance and repair services for slurry recirculation pump sumps and piping, absorber bypass damper systems, gypsum dewatering equipment foundations, and the structural steel and FRP (fiber-reinforced plastic) platforms that provide access to FGD system components. We are experienced with the slurry-service piping materials used in FGD systems — rubber-lined carbon steel, alloy steel, and HDPE — and the joining methods appropriate to each.