Investigations of nano coated calcium hydroxide cycled in a thermochemical heat storage
| Autor: | Reinhard Trettin, S. Afflerbach, Marc Linder, T. Kowald, Matthias Schmidt, Christian Roßkopf, B. Görtz |
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| Rok vydání: | 2015 |
| Předmět: |
Work (thermodynamics)
020209 energy Energy Engineering and Power Technology Mineralogy Nanoparticle 02 engineering and technology Permeance engineering.material Thermal energy storage 7. Clean energy aerosil chemistry.chemical_compound Coating rheinhardbrunsite calcio-chondrodite 0202 electrical engineering electronic engineering information engineering calcium hydroxide Calcium oxide Calcium hydroxide agglomeration Renewable Energy Sustainability and the Environment Chemistry Economies of agglomeration 021001 nanoscience & nanotechnology Fuel Technology Nuclear Energy and Engineering Chemical engineering 13. Climate action engineering nanoparticles thermochemical heat storage 0210 nano-technology |
| Popis: | Thermochemical heat storage systems are a promising new technology for concentrated solar power plants and can contribute to improve the efficiency of industrial processes Neveu et al. (2013) [21]. However, for example for the reaction system calcium oxide/calcium hydroxide (CaO/Ca(OH)2), the good availability at low cost is accompanied by poor powder properties that demand complex reactor solutions. During thermochemical cycling agglomeration effects occur and originate inhomogeneity resulting in permanent changes of bed characteristics especially related to the heat and mass transport. One approach in order to stabilize the material is to coat the reacting material with nanoparticles in order to minimize attractive forces leading to less agglomeration. But, high temperatures, change of volume and surface configuration, permeance for reaction gas, side reactions and mechanical stresses within the storage represent challenges for nanoparticles. Therefore, in this work, Aerosil® as additive for thermochemical storage is investigated during cycling in an indirect operating pilot-scale thermochemical reactor with regard to side reactions, stability on the surface and various coating configurations. It is shown that the reaction bed properties can be highly improved depending on the modality of the insertion process whereas occurring side reactions lead to a stabilization of the surface structure at the expense of a capacity loss of the thermochemical reactor. |
| Databáze: | OpenAIRE |
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