The Ohio Environmental Protection Agency on Sept. 18 issued a draft air permit-to-install (PTI) for the 742-MW, gas-fired power project of Carroll County Energy LLC.
The company has applied for a PTI to install a natural gas-fired, combined cycle gas turbine station in rural Carroll County, Ohio.
“The Project is intended to operate as a base-load facility and is proposed to be available to operate up to 8,760 hours per year, incorporating a range of load conditions,” the draft PTI said. “The Project also seeks the flexibility to operate with frequent starts in order to meet energy demands. Air emissions from the proposed Project primarily consist of products of combustion from the [combustion turbine generators] CTGs, [heat recovery steam generator] HRSG duct burners, and ancillary equipment and will be subject to Prevention of Significant Deterioration (PSD) requirements.”
The project will utilize General Electric (GE) 7FA combustion turbine technology. Duct firing will be incorporated into the design. An auxiliary boiler will be used to assist plant start-up and maintain warm-start conditions during standby periods. Back-up fuel oil for CTG and HRSG duct firing operations will not be used; except for the diesel-fired emergency equipment, the project will operate on natural gas only. The project will utilize air cooling and, therefore, water use and discharge volumes will be very low.
The project site consists of a 76.5-acre parcel of land located in Carroll County near Carrollton, Ohio. In addition to the site, Carroll County Energy has acquired rights to an adjacent 23-acre parcel for use as a construction laydown and parking area. Two utility electrical interconnections are under consideration, both within three miles of the site. Natural gas is also available in close proximity, with an existing Tennessee Gas Pipeline system located within 0.5 mile of the site.
The project will include the following major and ancillary equipment:
- two combustion turbine generators;
- two heat recovery steam generators with supplemental duct firing;
- one steam turbine generator;
- one air cooled condenser;
- pne 1,112-kW emergency diesel generator;
- one natural gas-fired, 99-million British thermal units (MMBtu) steam production auxiliary boiler;
- one 400-horsepower emergency fire pump; and
- storage tanks for aqueous ammonia, ultra low sulfur diesel fuel and water.
Carroll County Energy on Aug. 7 filed a pre-application notice with the Ohio Power Siting Board that it plans to build this gas-fired combined-cycle power plant in Carroll County. It used a figure of 700 MW for the project size.
“The proposed 700 MW combined cycle generation facility will be powered by natural gas and will be located on approximately 77 acres of privately owned land which is adjacent to a 23 acre site available for construction lay down,” said the brief notice. “The site will be in Washington Township, Carroll County, Ohio with access off of State Route 9 and will be located near an [American Electric Power] 345 KV transmission line.”