A thermodynamic and kinetic study of the de- and rehydration of Ca(OH)2 at high H2O partial pressures for thermo-chemical heat storage
By Franziska Schaube, Lisa K. Koch, A. Wörner, H. Müller-Steinhagen. 2012
318 citations recorded by the source corpus.
Abstract Heat storage technologies are used to improve energy efficiency of power plants and recovery of process heat. Storing thermal energy by reversible thermo-chemical reactions offers a promising option for high storage capacities especially at high temperatures. Due to its low material cost, the use of the reversible reaction Ca(OH) 2 ⇌ CaO + H 2 O has been proposed. This paper reports on the physical properties such as heat capacity, thermodynamic equilibrium, reaction enthalpy and kinetics. To achieve high reaction temperatures, high H 2 O partial pressures are required. Therefore the cycling stability is confirmed for H 2 O partial pressures up to 95.6 kPa and the dehydration and hydration kinetics are studied. Quantitative data are collected and expressions are derived which are in good agreement with the presented measurements. At 1 bar H 2 O partial pressure the expected equilibrium temperature is 505 °C and the reaction enthalpy is 104.4 kJ/mol.
Subfields: Biomedical Engineering, Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/2145b0f39fd7f5c432403de3a54f62ff706a8d10
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Citations in the corpus
- Ca(OH)2/CaO reversible reaction in a fluidized bed reactor for thermochemical heat storage (2014, methodology): “…storage related to the storage step w related to the duration of the charging or dis- charging step Environment Systems of Chiba University, as Chemical Heat Pump system (CHPs) (Ogura et al., 2003, 2004) and the German Aerospace Center (DLR) (Schaube et al., 2011, 2012a,b; Schmidt et al., 2014).”
- Experimental results of a 10 kW high temperature thermochemical storage reactor based on calcium hydroxide (2014, background): “Complete reversibility, cycling stability and sufficiently fast reaction kinetics of the system have been demonstrated in thermal gravimetric analysis studies [8].”