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Application Of Wet Compression For Aeroderivitive Combustion Turbines

by

Sanjeev Jolly, P.E.
Scott Cloyd
Caldwell Energy Company
Louisville, KY

James Hinrichs
PURENERGY LLC
San Diego, CA

ABSTRACT

While the application of wet compression to boost turbine capacity has been successfully applied to industrial frame machine, only recently has this technology been applied to aeroderivatives like the LM-2500. The principles of applying wet compression are similar to the industrial frame machines, but there are subtle differences that affect the design of the spray system, inlet duct modification, control system integration, and turbine protective devices. This paper discusses design differences and the performance enhancement of an LM-2500PE that was retrofit with wet compression at PurEnergy’s Kingsburg Congeneration Facility in Kingsburg, California. The LM-2500 is an interesting application because the compressor and power turbine are on different shafts which introduce speed and pressure variations between the gas generator and power turbine that affect the performance augmentation resulting from wet compression. Operating limits for surge and speed were also encountered which were not previously encountered on the single shaft industrial frames. The incremental performance per gallon of water is notably different from the industrial turbines which will be shown for comparison of the augmentation results along with a comparison of wet compression to other power augmentation technologies.

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