Florida agency ready to approve sorbent testing at Lansing Smith

The Florida Department of Environmental Protection on June 20 put out a notice of its intent to approve testing by Gulf Power of sorbents for possible future emissions control purposes at the coal-fired Lansing Smith Units 1 and 2.

Units 1 and 2 are tangentially fired, dry bottom coal-fueled boilers that began commercial operation in 1965 and 1967, respectively. Other Gulf Power documents give their sizes as Unit 1 (162 MW net) and Unit 2 (195 MW net). They have a common 199-foot stack and are equipped with the air pollution control and measurement equipment that includes:

  • Hot and cold side electrostatic precipitators (ESPs) to control particulate matter (PM);
  • Low NOX burners and non-selective catalytic reduction (SNCR) systems to control NOX; and
  • Continuous emissions monitoring systems (CEMS) to measure and record NOX and SO2 emissions and a continuous opacity monitoring system (COMS) to measure and record the opacity of the exhaust gas.

Gulf Power, a unit of Southen Co. (NYSE: SO), applied for approval of this project on June 10. The project is considered a test burn program of several emissions control sorbent additives called ClearChem, Hydrated Lime, Trona, and Activated Carbon. The test burn program will also involve the firing of Colombian coal in conjunction with the sorbent additives in an attempt to reduce emissions of SO2, hydrogen chloride (HCl), and mercury (Hg). The additives will be injected into the boiler, ESPs, or ductwork during the test burn program to decipher the optimal injection zone for the sorbents.

According to EnerChem Inc., the chemical ClearChem is based on micronized reagents (CaCO3, Ca(OH)2), and can be injected directly into the boiler at a very low cost, the DEP noted. The additive has minimal impact on industrial boilers and ESPs and according to the company the flyash after injection is marketable. Gulf Power will be testing the chemical additive at multiple unit loads in an attempt to minimize SO2, Hg and acid gases.

Trona will be used in the test project in an attempt to reduce SO2 emissions. The proposed test using Trona as a sorbent will be conducted at multiple loads with a maximum injection rate of 6,215 pounds per hour.

The additional mass loading increases the volume of ash to be handled, the DEP pointed out. Colombian coal contains about 3% less ash than the current coal fired in the boilers, therefore some of the potential emissions increase from the sorbents will be offset by the use of the lower ash fuel. With the addition of Trona, hydrated lime, and activated carbon there is at least the possibility of some minor changes in the coal, ash handling systems, and pollution control equipment to facilitate the overall emissions reduction objective.

In a March 1 filing at the Florida Public Service Commission, Gulf Power outlined these 2012 major coal suppliers and tonnages for Lansing Smith:

  • Interocean Coal Sales, 102,231 tons;
  • Oxbow Carbon, 39,158 tons; and
  • Patriot Coal Sales, 239,035 tons.
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.