Plant Wansley CC
Owned by Southern Company
Operated by Southern Power
1073 MW, two 2 × 1 7F.04-powered combined cycles equipped with GE D11 steam turbines, located near Carrollton, Ga
Plant manager: Mike Moro
Challenge. During an outage, when the generator does not contain hydrogen, the control system didn’t have an obvious way of indicating this critical information to people in the control room.
Solution. Install the new Cimplicity plant overview screen into the Mark VIe control system. With this modification, the color of the generator and gas turbine changes automatically on the screen when in an abnormal state (figure). This screen normally is displayed on one of the large monitors, allowing anyone in the control room to know at a glance what gas is in the generator.
Results. The logic works by using the hydrogen analyzer feedbacks to determine what gas is in the generator. Under normal conditions, with hydrogen in the generator, the analyzers are switched to “Percent H₂ in Air.” When the generator is being purged with CO₂, the analyzers are switched to “Percent H₂ in CO₂.” Finally, when the generator is completely purged of CO₂ and hydrogen, and contains air, the analyzers are switched to “Percent Air in CO₂.”
Project participants:
Jason Justice, Ryan Biggs, Doug Burnette, Shane Cummings, and Kevin Martinez
