Graduate Thesis Or Dissertation
 

Evaluation of Materials for Use in Open-Cycle Magnetohydrodynamic Power Generation

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  • Recent interest in oxy-fuel combustion for carbon capture, as well as advancements in technologies such as magnetics, materials, and computational modeling has sparked renewed interest in magnetohydrodynamic (MHD) power generation. The increased temperatures of oxy-fuel combustion versus air-fuel combustion poses a challenge in the selection of materials for plasma exposed components. Further, the combustion products are seeded with an ionized gas such as potassium which creates a highly corrosive environment for many materials. A selection of insulator and electrode materials from the refractory oxides are evaluated for their stability in extreme environments from plasma exposure. Electrical properties are also considered to gauge conductor or insulator performance and provide accurate values to enhance generator design modeling. Of those evaluated, ceria-based materials offer the best properties as electrode materials with electrical conductivities exceeding 100 S/m at 1300˚C while magnesia exhibits electrical conductivities well below 1 S/m for temperatures under 1600˚C. Both materials were found to resist potassium corrosion in controlled experiments suggesting minimal degradation in the presence of potassium seeded MHD environments.
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  • Bowen, M.S., Johnson, M., McQuade, R. et al. Electrical properties of gadolinia-doped ceria for electrodes for magnetohydrodynamic energy systems. SN Appl. Sci. 2, 1529 (2020). https://doi.org/10.1007/s42452-020-03280-2
  • M. Bowen, K. Kwong, P. Hsieh, D. Cann, and C. Woodside, "High Temperature Corrosion Stability of Ceramic Materials for Magnetohydrodynamic Generators," Materials Performance and Characterization . Published ahead of print, May 07, 2021, https://doi.org/10.1520/MPC20200160
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  • This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed therein do not necessarily state or reflect those of the United States Government or any agency thereof.
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  • Ongoing Research
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  • 2021-07-22 to 2021-08-02

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