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MATERIAL CHALLENGES FOR ADVANCED STEAM PLANTS

Explore the challenges faced by the power generation industry in meeting efficiency demands, environmental regulations, and safety guidelines. Learn about the need for advanced materials in steam plants operating at high parameters, addressing issues such as fireside corrosion, creep, fractures, and more. Discover material options, considerations, and conclusions for enhancing steam turbines. Embrace advances in materials development for higher efficiencies and improved performance.

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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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