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MATERIAL CHALLENGES FOR ADVANCED STEAM PLANTS

MATERIAL CHALLENGES FOR ADVANCED STEAM PLANTS. Dr. M. Shekhar Kumar Materials Technology Division Central Power Research Institute Bangalore. Challenges.

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MATERIAL CHALLENGES FOR ADVANCED STEAM PLANTS

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  1. MATERIAL CHALLENGES FOR ADVANCED STEAM PLANTS Dr. M. Shekhar Kumar Materials Technology Division Central Power Research Institute Bangalore

  2. Challenges • Challenge faced by the power generation industry to meet increasing demand through increased efficiency and reduction of operation and maintenance costs and also meeting environmental and safety regulations • Need for development of advanced materials • Material changes over the years have resulted in operation at 170 bar and 540 C –efficiency of 35% • Need to step up steam parameters

  3. Drawbacks on the boiler side • Fireside corrosion of water walls and superheater • Creep, Crack and Rupture • Steam side oxidation • Fracture toughness • Thermal Fatigue • Acid corrosion on the exhaust side

  4. Drawbacks on the Turbine side • Strength, ductility and toughness • Wear and erosion • Creep, Crack and Rupture • High cycle fatigue • Scaling • Embrittlement • Lack of mechanical property data

  5. Material Options • Super Alloys • Ferritic Steels • Stainless Steels • Coatings • Composites • Intermetallics

  6. Material Considerations • Strength to resist deformation and rupture at design conditions • Fatigue strength and damping capacity when cycling stresses are involved • Ability to resist stress concentrations • Resistance to oxidation, corrosion and erosion • Ability to resist damaging metallurgical changes during operation • Ease of fabrication, field construction and maintenance • Good physical properties to minimise thermal stresses • Cost

  7. LOW ALLOY STEEL

  8. Austenitic Steel

  9. Candidate Boiler Materials

  10. MATERIALS FOR STEAM TURBINES

  11. Conclusions • Advances in materials development need focus • Potential use of ceramics, ceramic matrix composites and ceramic/metal joining technologies • Protective coatings • Emphasis on materials for efficiencies greater than 55% • Allied services

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