Thermochemical cycles for energy storage: Thermal decomposition of ZnCO{sub 4} systems. Final topical report, January 1, 1982--December 31, 1984
- Houston Univ., TX (United States)
The overall objective of our research has been to develop thermochemical cycles that can be used for energy storage. A specific cycle involving ammonium hydrogen sulfate (NH{sub 4}HSO{sub 4}) has been proposed. Each reaction in the proposed cycle has been examined experimentally. Emphasis has been placed on the basic chemistry of these reactions. In the concluding phase of this research, reported herein, we have shown that when NH{sub 4}HSO{sub 4} is mixed with ZnO and decomposed, the resulting products can be released stepwise (H{sub 2}A{sub (g)} at {approximately}163{degrees}C, NH{sub 3(g)} at 365--418{degrees}C, and a mixture of SO{sub 2(g)} and SO{sub 3(g)} at {approximately}900{degrees}C) and separated by controlling the reaction temperature. Side reactions do not appear to be significant and the respective yields are high as would be required for the successful use of this energy storage reaction in the proposed cycle. Thermodynamic, kinetic, and other reaction parameters have been measured for the various steps of the reaction. Finally we have completed a detailed investigation of one particular reaction: the thermal decomposition of zinc sulfate (ZnSO{sub 4}). We have demonstrated that this reaction can be accelerated and the temperature required reduced by the addition of excess ZnO, V{sub 2}A{sub 5} and possibly other metal oxides.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States); Houston Univ., TX (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 10146950
- Report Number(s):
- NREL/TP-253-4279; ON: DE91002144
- Resource Relation:
- Other Information: PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
ZINC SULFATES
DECOMPOSITION
AMMONIUM COMPOUNDS
CHEMICAL REACTION KINETICS
THERMOCHEMICAL HEAT STORAGE
PROGRESS REPORT
ZINC OXIDES
ENERGY STORAGE
VANADIUM OXIDES
LITHIUM SULFATES
MIXTURES
SOLUBILITY
THERMOCHEMICAL CYCLES
THERMAL DECOMPOSITION
ZINC SULFATE
AMMONIUM HYDROGEN SULFATE
250800
142000
CHEMICAL
HEAT STORAGE