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Inlet Air Fogging Upgrade for 2 x GE 7FB.04 Turbines in Wisconsin

High-efficiency MeeFog Pump Skid inside a heated pump shelter

Two existing OEM-supplied fog systems were replaced with MeeFog systems. The original systems had five pumps that required excessive maintenance and a winterization procedure that took days to accomplish. The MeeFog system has one water lubricated pump located inside a heated pump shelter. Staging valves provide 16 cooling stages. A VFD slows the pump down as staging valves close to maintain 2,000 psi discharge pressure. Winterization is automatic, drain valves open when the ambient temperature falls below a set point. The fog controls were integrated into the Ovation DCS.

Project Conditions:

Location: Wisconsin
Hot day conditions: 89 °F and 52% RH
Model: GE 7FB.04
Elevation: 658 feet
Mee’s scope of work: Turnkey including installation
Max power boost per GT: 14.50 MW

Fog System Design:

Cooling Stages: 16
Operating Pressure: 2,000 psi
Fog Droplet Size: 19 microns (Dv90)
MeeFog™ Nozzle Count: 780
Nozzle Flow Rate: 0.045 gpm
Max. Skid Water Flow: 35 gpm
Max. Power Requirement: 60 HP

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