Sulfuric acid-sulfur heat storage cycle
- LaJolla, CA
A method of storing heat is provided utilizing a chemical cycle which interconverts sulfuric acid and sulfur. The method can be used to levelize the energy obtained from intermittent heat sources, such as solar collectors. Dilute sulfuric acid is concentrated by evaporation of water, and the concentrated sulfuric acid is boiled and decomposed using intense heat from the heat source, forming sulfur dioxide and oxygen. The sulfur dioxide is reacted with water in a disproportionation reaction yielding dilute sulfuric acid, which is recycled, and elemental sulfur. The sulfur has substantial potential chemical energy and represents the storage of a significant portion of the energy obtained from the heat source. The sulfur is burned whenever required to release the stored energy. A particularly advantageous use of the heat storage method is in conjunction with a solar-powered facility which uses the Bunsen reaction in a water-splitting process. The energy storage method is used to levelize the availability of solar energy while some of the sulfur dioxide produced in the heat storage reactions is converted to sulfuric acid in the Bunsen reaction.
- Research Organization:
- General Atomics Site, San Diego, CA
- DOE Contract Number:
- AC01-80CS80004
- Assignee:
- GA Technologies Inc. (San Diego, CA)
- Patent Number(s):
- US 4421734
- Application Number:
- 06/377,124
- OSTI ID:
- 864808
- Country of Publication:
- United States
- Language:
- English
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