Engine & Turbine Technology
Energy efficiency driven by turbine replacement and upgrades
As the demand for electricity continues to grow around the world, the need for new and uprated turbines is also forging ahead. Sean Ottewell reports.
A medida que la demanda de electricidad continua creciendo en todo el mundo, la necesidad de nuevas y mejoradas turbinas también aumenta. Informa Sean Ottewell.
Die Energienachfrage wächst weltweit immer weiter, dadurch steigt auch die Nachfrage nach neuen und besseren Turbinen. Sean Ottewell berichtet.
E
merson Process Management has successfully replaced existing controls on the Nikiski generation plant’s GE Frame 6B gas turbine with its Ovation control technology.
Tis marks one of the few times an outside
vendor has been chosen to retrofit Mark VI controls, says Emerson. Te plant, owned and operated by Homer Electric Association (HEA), is located southwest of Anchorage, Alaska (Fig. 1).
Te controls replacement project was part of the first phase of a two-phase initiative to convert the 40MW, simple-cycle power plant to a 60MW, combined-cycle facility. Te resulting 45 per cent increase in generation capacity with a minimal increase in fuel consumption will enable HEA to cost-effectively meet the electricity needs of the Kenai Peninsula.
An additional 20MW capacity is available
through the use of duct-firing capability built into the existing heat recovery steam generator (HRSG). Tis brings the total plant capacity to 80MW, but requires additional fuel consumption.
In addition to replacing the Mark VI turbine controls, Emerson integrated the GE EX2100 excitation system into the new Ovation system, enabling it to remotely control its own functionality. Emerson also provided a simulation solution, which is used to test and verify control logic, as well as to train operators on the new system; and a remote dispatch capability that will give HEA greater operational flexibility and efficiency. “As part of this major effort to convert the plant to a combined-cycle facility, we wanted to take advantage of every opportunity to ensure the plant would operate at peak efficiency for years to come,” said Brad Zubeck, programme manager for HEA. “Moving to a single control platform is
advantageous for many reasons, among them the ability to have tighter overall control of plant operations, as well as a clearer view of key plant and turbine parameters.” Emerson’s comprehensive solution for phase one also included its AMS Suite predictive maintenance software for more efficient management of intelligent field devices, as
Fig. 1. An outside vendor was selected to replace existing controls on the gas turbine at the Nikiski generation plant in Alaska.
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