A sulfur based thermochemical energy storage cycle for baseload power generation is being developed under the support of US DOE Sunshot program. Solar heat is stored in elemental sulfur via thermal decomposition of sulfuric acid and disproportionation of sulfur dioxide into elemental sulfur and sulfuric acid. Heat energy is recovered upon sulfur combustion. On-sun decomposition of sulfuric acid in a solar furnace has been demonstrated between 650 and 850°C. Near equilibrium conversion was obtained at high temperature but conversion was reduced due to catalyst poisoning at the lower temperatures. Sulfur dioxide disproportionation modeling showed the reaction driving force is maximized at the high system pressure and low system temperature. The effect of system pressure was validated experimentally. However, the disproportionation rate was found to increase with system temperature as a result of increased reaction kinetics. Homogenous iodide catalysts were used to further enhance the degree of disproportionation and the reaction rate. The process steps required to recover the catalyst for reuse have been verified.
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ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology
July 14–19, 2013
Minneapolis, Minnesota, USA
Conference Sponsors:
- Advanced Energy Systems Division
- Solar Energy Division
ISBN:
978-0-7918-5551-5
PROCEEDINGS PAPER
Sulfur Based Thermochemical Energy Storage for Concentrated Solar Power
Dennis Thomey,
Dennis Thomey
German Aerospace Center, Cologne, Germany
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Martin Roeb,
Martin Roeb
German Aerospace Center, Cologne, Germany
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Robert Buckingham,
Robert Buckingham
General Atomics, San Diego, CA
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Christian Sattler
Christian Sattler
German Aerospace Center, Cologne, Germany
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Bunsen Wong
General Atomics, San Diego, CA
Dennis Thomey
German Aerospace Center, Cologne, Germany
Lloyd Brown
General Atomics, San Diego, CA
Martin Roeb
German Aerospace Center, Cologne, Germany
Robert Buckingham
General Atomics, San Diego, CA
Christian Sattler
German Aerospace Center, Cologne, Germany
Paper No:
ES2013-18283, V001T11A009; 6 pages
Published Online:
December 22, 2013
Citation
Wong, B, Thomey, D, Brown, L, Roeb, M, Buckingham, R, & Sattler, C. "Sulfur Based Thermochemical Energy Storage for Concentrated Solar Power." Proceedings of the ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. ASME 2013 7th International Conference on Energy Sustainability. Minneapolis, Minnesota, USA. July 14–19, 2013. V001T11A009. ASME. https://doi.org/10.1115/ES2013-18283
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