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Field Testing and Analysis of Air-Cooled Condenser Components Coated with Cerium oxide-doped PAAMPS Polymer Nanocomposit

Outline. Direct water spray as cooling enhancementCorrosion- and scale-resistant coatingField tests of finned tubing materialsConclusions. Background. Net power output of air-cooled binary plants down significantly in summerEnhancement methods using water shown to raise power output dramatically.

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Field Testing and Analysis of Air-Cooled Condenser Components Coated with Cerium oxide-doped PAAMPS Polymer Nanocomposit

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    1. Field Testing and Analysis of Air-Cooled Condenser Components Coated with Cerium oxide-doped PAAMPS Polymer Nanocomposite Material T. Sugama Brookhaven National Laboratory K. Gawlik National Renewable Energy Laboratory B. Sullivan Mammoth Pacific LP GRC Annual Meeting, September 11, 2006

    2. Outline Direct water spray as cooling enhancement Corrosion- and scale-resistant coating Field tests of finned tubing materials Conclusions

    3. Background Net power output of air-cooled binary plants down significantly in summer Enhancement methods using water shown to raise power output dramatically

    4. Deluge cooling

    5. Evaporative cooling of air

    6. Comparison of enhancement methods

    7. Pros and cons of direct water spray Direct water spray most effective Clean brines, treated wastewater can be used Significant scaling and corrosion issues

    8. Proposed solution Thin, polymer coating Low heat transfer resistance Corrosion barrier Scale resistant Easy to clean

    9. Organometallic polymer coating

    10. Field test at Mammoth Uncoated and coated aluminum and steel coupons Coating with and without cerium oxide Thickesses from 3.5 to 10 microns Exposure to brine for 8.5 months 24,500 wet-dry cycles

    11. Field test apparatus

    12. Uncoated

    13. SEM-EDX analysis

    14. Spectral analysis for uncorroded and corroded fins

    15. Cerium oxide reduces corrosion rate

    16. Additional thickness reduces corrosion rate

    17. Conclusions Corrosion reduced by Passive layer formed by cerium oxide nanoparticles Additional thickness Better performance anticipated with other rare earth metals, such as samarium oxide

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