Steam Electric Plant (SEP) Units 7 and 8 Coal-to-Gas Boiler Conversion
Project Highlights
- Conversion of two pulverized coal boilers units providing steam to 33,000-kW and 65,000-kW turbine generators.
- Firm subsequently awarded contract to upgrade control systems and addition of new control room.
Project Description
Conversion of two units at the City of Ames, Iowa steam electric plant from coal to natural gas. Unit 7 is a tangentially fired pulverized coal boiler supplying steam to a 33,000-kW non-reheat turbine generator, while Unit 8 is a wall-fired pulverized coal boiler supplying steam to a 65,000-kW non-reheat turbine generator.
The project followed an extensive evaluation of options for Ames officials to comply with Mercury Air Toxics Standards regulations and continue to utilize the units to cofire refuse-derived fuel to reduce the amount of waste sent to landfills.
Ames awarded the contract to Sargent & Lundy after determining that the firm’s “comprehension of the project, their project plan and approach, and the relevant knowledge of their team… was superior to the other semi-finalists.”
Project Scope
The initial project scope included the engineering services for conversion of the units and construction management support during installation. Work began with the project team developing the equipment specification for the conversion and completing an evaluation of the existing control systems. The design allowed for future coal firing in the units. Based on the team’s performance, Sargent & Lundy was awarded additional work to design a full upgrade of the units’ control systems, including the addition of a new control room.
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