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Materials for high temperature liquid lead storage for concentrated solar power (Csp) air tower systems

TitleMaterials for high temperature liquid lead storage for concentrated solar power (Csp) air tower systems
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2021
AuthorsRinaldi, Antonio, Barbieri Giuseppe, Kosykh E., Szakalos P., and Testani C.
KeywordsAluminum alloys, Aluminum metallography, Chromium alloys, Chromium metallography, Concentrated solar power, Corrosion resistant coatings, Creep, Creep resistance, Experimental activities, Experimental projects, Heat exchange fluids, Heat exchangers, Heat resistance, High-temperature liquids, Innovative solutions, Iron alloys, Iron metallography, Liquids, Materials and technologies, Scanning electron microscopy, Solar power plants, Steel corrosion, Steel testing, Technical solutions, Ternary alloys

Today the technical limit for solar towers is represented by the temperature that can be reached with current accumulation and exchange fluids (molten salts are generally adopted and the max temperatures are generally below 600◦ C), even if other solutions have been suggested that reach 800◦ C. An innovative solution based on liquid lead has been proposed in an ongoing experimental project named Nextower. The Nextower project aims to improve current technologies of the solar sector by transferring experience, originally consolidated in the field of nuclear plants, to accumulate heat at higher temperatures (T = 850–900◦ C) through the use of liquid lead heat exchangers. The adoption of molten lead as a heat exchange fluid poses important criticalities of both corrosion and creep resistance, due to the temperatures and structural stresses reached during service. Liquid lead corrosion issues and solutions in addition to creep-resistant material selection are discussed. The experimental activities focused on technical solutions adopted to overcome these problems in terms of the selected materials and technologies. Corrosion laboratory tests have been designed in order to verify if structural 800H steel coated with 6 mm of FeCrAl alloy layers are able to resist the liquid lead attack up to 900◦ C and for 1000 h or more. The metallographic results were obtained by mean of scanning electron microscopy with an energy dispersive microprobe confirm that the 800H steel shows no sign of corrosion after the completion of the tests. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.


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Citation KeyRinaldi2021