The Michigan Department of Environmental Quality’s Air Quality Division is proposing to act on a Permit to Install (PTI) application from Wyandotte Municipal Services covering the proposed installation and operation of two new boilers and a combustion turbine with heat recovery steam generator (HRSG).
Prior to acting on this application, the AQD is holding a public comment period until July 17 and a public hearing, if requested in writing.
The existimg facility is located in Wyandotte, Wayne County, Michigan. Wyandotte is a community-owned and operated entity that provides electricity, water, telephone, internet and cable television services to city residents. Wyandotte currently operates three boilers (Units 5, 7, and 8), and three engine generators for back-up power. Unit 5 is a natural gas-fired boiler and is used for back-up to the other two boilers. Unit 7 is a wall-fired pulverized coal-fired boiler that is also capable of firing natural gas and propane. Unit 8 is a circulating fluidized-bed boiler capable of firing coal, untreated virgin wood chip waste and tire-derived fuel.
Wyandotte is proposing to install new natural gas-fired equipment: two boilers known as Unit 9 and Unit 10; and a combustion turbine with heat recoveery steam generator (HRSG). Wyandotte would also permanently shut down the Unit 8 boiler. The proposed new natural gas-fired boilers are rated at 160 million British thermal units per hour (MMBtu/hr) and 90 MMBtu/hr. The combustion turbine is natural gas-fired and is rated at 20 MW output or 247 MMBtu/hr heat input. The natural gas-fired duct burner for the HRSG is rated at 90 MMBtu/hr, and is not capable of operating separately from the combustion turbine.
Besides the proposed new equipment, and the shutdown of the Unit 8 boiler, no other equipment is affected by this permitting.
The Unit 8 boiler is a 25-MW, 900 psi circulating fluidized-bed boiler with a maximum steam generating capacity of 275,000 pounds per hour. Natural gas is used in the boiler for start-up. The boiler utilizes limestone injection to control SO2 emissions and a baghouse for particulate matter control.