IGTI 2011 June 8th, 2011 - Turbine Inlet Air Cooling · Microsoft PowerPoint - Fogging Presentation...
Transcript of IGTI 2011 June 8th, 2011 - Turbine Inlet Air Cooling · Microsoft PowerPoint - Fogging Presentation...
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IGTI 2011IGTI 2011
June 8June 8thth, 2011, 2011
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EVAPORATIVE COOLING FOGGING TECHNOLOGY
Cam cooling compressor inlet air to within 1°F of ambient wet bulb temperature at wet
b lb t t 50° Fbulb temperatures > 50° F.
CT Power Increase 4% to 12%CT Power Increase 4% to 12%
Lead Time 30 – 45 days
Installed Cost $20 - $60 / kWInstalled Cost $20 - $60 / kW
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PSYCHROMETRIC ANALYSIS
SATURATION
T = 290
660 F WB 950 F DB
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TEMPERATURE CHARACTERISTICS
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Inlet Fogging Systems
Inlet configurations can promote droplet growth
Large droplets have resulted in excessive blade erosion –greatly exceeding wet compression experience
Fogging s stems m st be caref ll integrated ith the inletFogging systems must be carefully integrated with the inlet air system
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System RequirementsSystem Requirements
• Fogging Systems use Demin Water• Fogging Systems use Demin Water• Foggers use 1.5 kW or less of power per gallon of
water used• A typical 7FA requiring 21F of cooling uses 30 GPM
of water• Droplet sizes of 20 micron for a D90 are desired• Air side pressure loss less than 0.1 in wc• The heat rate is improved by about 4% for a 21F• The heat rate is improved by about 4% for a 21F
system
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First Generation Fogging Systems
• Pumps dedicated to specific cooling zones –
Excessive cycling
1°
– Excessive cycling – Loss of cooling increment during
pump maintenance• Pumps operated near design
2°
3° • Pumps operated near design conditions– Seal life reduced
St d d t k i
3
7°• Standard component packaging
– Excessive vibration• Impact-pin nozzles7° p p
– Droplet size control & maintenance
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Nozzle Development
Pin less Nozzle for new andImpact Pin Type Nozzle Pin-less Nozzle for new and service replacement
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Independent PDPA Testing
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4 Zones of Fogging In Operation4 Zones of Fogging In OperationFog Droplets Light and Uniform
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Second Generation FoggingSecond Generation FoggingFocus on System Reliability
• Common discharge manifold– Pump schedule based on hours / starts– Pump maintenance reduces max flow p
capability not zone control– Enables redundant pump to be used
• Pump design margin (speed & pressure) – Extends seal life
1°
2° – Extends seal life• Components custom packaged• Pin-less nozzles
– Smaller droplets
2
3°p
– Less installation / maintenance risk• O-ring nozzle seal
– Reduces replacement time and cloggingI li filt d l l i
7°
7°• In-line filters – reduces nozzle clogging
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Common Manifold Design
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Water Agglomeration
Water l i
Water coalesces on t t l
coalescing on vertical structural steel ran to
structural steel -shedding large drops
the duct floor.
g pinto inlet air stream
Water puddles in trough created byWater puddles in trough created by duct floor and trash screen structural steel
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Fogging System Integration
Filter ho se inlet d ct silencer and• Filter house, inlet duct, silencer and compressor manifold treatment (lining, coating drains)coating, drains)
• New unit inlet duct configuration optimization• Droplet size control and spacing• Droplet size control and spacing• Control logic and integration with Combustion
Turbine Control SystemTurbine Control System• Water quality specification
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Third Generation FoggingThird Generation Fogging Evaporation Enhancements
• Enhanced water distribution at design conditioncondition
• Enhanced water distribution at off design conditionsconditions
• Reduced droplet size• Water droplet management (patent pending)• Water droplet management (patent pending)• Single VFD Pump Design
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VFD Fogger Skid