ID Fan

Tennessee Valley Authority (TVA) Kingston Plant

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Plant Specifications

• Produces 10 billion kilowatt-hours of electricity annually
• Consumes 14,000 tons of blended low sulfur coal daily
• Nine 190 MWh boilers using 2 Westinghouse 16 MVID fans
• Fan design is double inlet, single exhaust
• Throughput 400,000 CFM @ 600 RPM shaft speed
• Each fan consists of 120 forward curved fan blades
• Units 1-4 & 9 use combustion controls and boiler optimization
• Units 5-8 utilize low NOx burners
• All nine units utilize SCR’s to further reduce emissions

Erosion Issues

• Electrostatic precipitators were added to all 9 units in 1977
• Due to plant design constraints precipitators on units 5-9 were upstream
• Fans on units 5-9 eroded due to high dust loads, approx 3.6gms/acfm
• Useful fan service life of 12-14 months with A36 steel blade and hubs
• Soot blowers added in 1999, reducing service life to 5-8 months
• Maintenance cost on fans alone — $500,000 annually

Conforma Clad Solution

• Six different protection materials/systems tested
• Conforma Clad^® brazed WC 200 selected by TVAER&TA / EPRI / WR&D
• Fan service life increased to 36 months with predictable performance
• Current design improvements expected to extend service life to 48 months
• Additional generating hours with extended outages 576 hrs
• Total MW gain due to outage avoidance 547,200
• Generation revenue gain — $32,832,000
• Plus parts and labor costs

Note:
EPRI  — Electric Power Research Institute
TVAER&TA  — TVA Energy Research & Technology Application
WR&D — Westinghouse Research & Development

Fan service life increased to 36 months with predictable performance.