Florida agency okays upgrades for scrubber at Lakeland’s McIntosh plant

The Florida Department of Environmental Protection on Jan. 9 issued a final air construction permit that authorizes the upgrade of the existing wet flue gas desulfurization (FGD) system on Unit 3 at the C. D. McIntosh Power Plant to improve SO2 emissions reduction efficiency to comply with the federal Mercury and Air Toxics Standards (MATS).

The existing Lakeland Electric facility consists of three fossil fuel fired steam generators, three diesel powered engines, and two gas turbines. Unit 1 is fired with natural gas, No. 6 fuel oil or on-specification used oil. Unit 2 is fired with natural gas, propane, No. 2 fuel oil or No. 6 fuel oil. Unit 3, to get the FGD upgrades, is fired with coal, fuel oil and natural gas. Gas Turbine Peaking Unit 1 is primarily fired with natural gas or No. 2 fuel oil. McIntosh Unit 5, a 370-MW combined cycle stationary combustion turbine, is fired with natural gas, or No. 2 or superior grade fuel oil. 

McIntosh Unit 3 is a nominal 364-MW (electric) dry bottom wall-fired fossil fuel fired steam generator. Lakeland Electric is now authorized to upgrade the existing wet FGD system on Unit 3 by:

  • Modifying the tray bottoms in the existing absorber tray;
  • Adding new second level absorber tray;
  • Replacing mist eliminator trays;
  • Adding nozzles per layer (optional);
  • Changing nozzle design (optional); and
  • Increasing absorber pump speed (optional).

The existing wet FGD with forced oxidation system has two Babcock & Wilcox absorber tower modules that can each process 50% of the flue gas flow or can bypass the flue gas flow. It also has a flue gas reheat system that reheats the processed flue gas to a certain temperature in order to keep the stack liner dry. Each tower has: an absorption tray, three levels of slurry spray nozzles, primary and secondary moisture separators with spray headers for cleaning the moisture separators, forced oxidation system with blowers, lances and agitators and three absorber recirculation pumps each with a dedicated spray header.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.