Nebraska City Unit 2 Coal-Fired Power Plant

As Kiewit’s first modern coal-fired power plant construction project, the Nebraska City Unit 2 facility has been an exciting success. The new plant at Nebraska City more than doubles the current power output at the original facility that was built in the 1970s.

A Kiewit-led joint venture was awarded the contract to engineer, procure, construct, start-up and test a 660-megawatt coal-fired power plant with an IHI subcritical pulverized coal boiler; five IHI coal mills; a Toshiba steam turbine; TEI condenser and feedwater heaters; Flowserve condensate, circulating water, closed cooling water and boiler feedwater pumps; and an 18-cell cooling tower. The new plant incorporates state-of-the-art emission controls, including an Alstom spray dryer absorber and pulse jet fabric filter baghouse; a selective catalytic reduction system; and fly-ash and bottom-ash handling systems.

Additionally, a powdered activated carbon injection system provides a 12-day supply of powdered-activated carbon that is conveyed to the spray dryer absorber supply ducts and used for mercury control in the flue gas at the facility. All components of the system work together to feed the powdered activated carbon from a carbon silo into the spray dryer absorber inlet duct through 24 duct injection lances, thereby minimizing the mercury component in the flue gas to the client’s specified levels.

The plant was named as one of POWER magazine’s 2009 top plants.