Indianapolis Power & Light gets approval on Petersburg air projects

The Indiana Department of Environmental Management on May 8 approved an air permit covering new activated carbon injection systems to be installed on all four coal units at the coal-fired Petersburg power plant of Indianapolis Power & Light.

The following facilities, needed to comply with the Utility Maximum Achievable Control Technology (MACT) rule, were approved for construction:

  • One activated carbon injection silo, serving unit 1, identified as ACI-1, planned to be constructed in 2013, with a maximum storage capacity of 160 tons, and a maximum throughput of 650 lbs/hr, controlled by a bin vent filter.
  • One activated carbon injection silo, serving unit 2, identified as ACI-2, planned to be constructed in 2014, with a maximum storage capacity of 230 tons, and a maximum throughput of 1,225 lbs/hr, controlled by a bin vent filter.
  • One activated carbon injection silo, serving unit 3, identified as ACI-3, planned to be constructed in 2014, with a maximum storage capacity of 275 tons, and a maximum throughput of 1,637 lbs/hr, controlled by a bin vent filter.
  • One activated carbon injection silo, serving unit 4, identified as ACI-4, planned to be constructed in 2014, with a maximum storage capacity of 275 tons, and a maximum throughput of 1,640 lbs/hr, controlled by a bin vent filter.

The affected generating units consist of:

  • One coal/No. 2 fuel oil fired boiler, identified as Unit 1, constructed prior to 1967, with a design capacity of 2,200 MMBtu per hour. Unit 1 uses an electrostatic precipitator and flue gas desulfurization (FGD) scrubber (installed in 1996) as control, and low NOX burner (installed in 1995) for NOX reduction.
  • One coal/No. 2 fuel oil fired boiler, identified as Unit 2, constructed prior to 1969, with a design capacity of 4,144 MMBtu per hour. Unit 2 uses an electrostatic precipitator, FGD scrubber (installed in 1996), and selective catalytic reduction (installed in 2004) as control, and low NOX burner for NOX reduction.
  • One coal/No. 2 fuel oil fired boiler, identified as Unit 3, constructed prior to 1977, with a design capacity of 5,540 MMBtu per hour. Unit 3 uses an electrostatic precipitator, selective catalytic reduction (installed in 2004) and an FGD scrubber as control.
  • One coal/No. 2 fuel oil fired boiler, identified as Unit 4, on which construction began in 1978 and which began operation in 1986, with a design capacity of 5,550 MMBtu per hour. Unit 4 uses an electrostatic precipitator and FGD scrubber as control, and low NOX burner (installed in 2001) for NOX reduction. 

IPL, a unit of AES Corp. (NYSE: AES), filed an application on these and other planned air projects in September 2012 at the Indiana Utility Regulatory Commission. IPL has settled issues in that case with parties but the docket was still open as of May 10.

The summer-rated capacity of the Petersburg units is 1,752 MW and it is 427 MW for Harding Street Unit 7. IPL said these new emissions controls are needed to comply with various environmental regulations, including the Mercury and Air Toxics Standards (also known as the Utility MACT). IPL wants to:

  • install and operate a Pulse Air Fabric Filter System (baghouse) on Units 2 and 3 at Petersburg;
  • upgrade the electrostatic precipitators on Unit 7 at Harding Street and Petersburg Units 1, 3 and 4; and
  • install other environmental controls and monitoring equipment including activated carbon injection, sorbent injection, FGD system upgrades and continuous emission monitoring equipment.
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.