The boiler is the focus of several major projects during the outage.
Joe Bowman, Laramie River maintenance planning/scheduling supervisor, says crews will be replacing the intermediate section and outlet section of the secondary super heater.
“Over the years we have had several issues arise indicating that in the very near future we would begin to experience boiler tube failures in those two sections of the boiler. We will remove worn-out panels and replace them with new ones,” he says.
The boiler is also receiving an over-fire air system like Unit 1 did last year. The project is needed to reduce nitrogen oxide emissions, as will be required by upcoming regulations in the state of Wyoming. New water cannons to remove ash buildup from the boiler water walls are also being added to replace existing soot blowers that used steam, Bowman says.
On the turbine, the focus is the high-pressure/intermediate pressure turbine, which was removed and shipped to Richmond, VA, for work to its steam path. “This will make the Unit 2 turbine like the units 1 and 3 turbines with their steam path work we recently completed,” he says.
The unit is scheduled to be returned to service on May 30.