Duke Energy Florida approved for Hines inlet chiller project

The Florida Department of Environmental Protection on Jan. 8 issued the final air construction permit allowing Duke Energy Florida to install air chillers at the compressor inlet of each of the eight combustion turbine-electric generators at the Hines Energy Complex located in Polk County, Florida.

This project won’t actually increase the overall generating capacity of the plant, but will allow the plant to operate at full capacity during the summer heat. The existing facility is comprised of four power blocks:

  • Power Block 1 consists of two combined cycle combustion turbine generators (CTs) with unfired heat recovery steam generators (HRSGs), for a nominal total of 500 MW, a 99 million British thermal unit per hour (MMBtu/hr) auxiliary boiler, and a 97,570 barrel fuel oil storage tank. Emissions from each CT and HRSG combination are vented through a single stack.
  • Power Block 2 has two combined cycle CTs with unfired HRSG, and an associated single steam-turbine electrical generator, for a nominal total of 530 MW. Emissions from each CT and HRSG combination are vented through a single stack.
  • Power Block 3 has two combined cycle CTs with unfired HRSG, and an associated single steam-turbine electrical generator, for a nominal total of 530 MW. Emissions from each CT and HRSG combination are vented through a single stack.
  • Power Block 4 consists of two combined cycle CTs with unfired HRSG, and an associated single steam-turbine electrical generator, for a nominal total of 530 MW. Emissions from each CT and HRSG combination are vented through a single stack.

The project is to install air chillers at the compressor inlet of each of the CTs. The equipment involved is:

  • Installation of Water Chilling System: Duke Energy Florida is authorized to install a water chilling, storage and supply system comprised of: mechanical water chillers, a 13 million gallon thermal storage tank, pumps, heat exchangers and one or more cooling towers with a total evaporative capacity of approximately 1 million gallons per day. The system will supply chilled water to the equipment described in the condition below.
  • Installation of Combustion Turbine (CT) Inlet Air Chilling Systems: The utility is authorized to install water-cooled compressor inlet air chillers on all eight CTs. When actuated, chilled water will be circulated through heat exchangers (air cooling coils mounted on each CT air compressor inlet filter) in order to chill the compressor inlet air to approximately 50° F.

This past fall, the Florida Public Service Commission approved Duke Energy Florida, a unit of Duke Energy (NYSE: DUK), to add the Hines project as a short-term capacity solution, and to build the new 1,640-MW Citrus combined-cycle project as a longer-term solution. Incidentally, the DEP on Dec. 16, 2014, issued the final air construction permit for the Citrus project.

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.