Increase in MW output
Improvement in heat rate
This plant is a 2 x 1 combined cycle facility, with two GE Frame 7EA combustion gas turbines fitted with Nooter Ericksen HRSGs (w/duct burners) feeding an ABB VAX steam turbine. The plant was originally configured as a 220 MW cogeneration station, providing 900 psig and 250 psig steam (via turbine extraction) to support operation at a neighboring refinery. Closure of the refinery resulted in unused steam capacity.
Altran evaluated potential uses for the unused steam. This included both Power Augmentation (steam injection into new combustors) and installation of a second condensing steam turbine. The resulting analysis indicated that these projects will yield a 34% increase in MW output and a 13% improvement in heat rate.
Altran provided engineering, procurement and construction management for the new Siemens STG-600, SPX condenser and evaporative cooling tower, including integration of the STG controls with the Emerson DCS. The project was placed in service June 1, 2016 to support summer peak loading.
What we delivered