Improvement of a semipermeable shell for encapsulation of calcium hydroxide for thermochemical heat storage solutions: Material design and evaluation in laboratory and reactor scale

摘要: Abstract Thermochemical heat storage concepts offer a promising contribution to an economic, efficient and sustainable future energy supply. The reaction system CaO/Ca(OH)2 is amongst the most considered systems for Concentrated Solar Power (CSP) applications, but as cost efficiency good availability of material are accompanied by poor powder properties, complex costly reactor solutions required. Hence, modifications promise option reliable long-term operation. present work discusses considerations on inter- intraparticular changes options particle size stabilization. With background previous work, experimental section presents successful approach enhancement mechanical stability ceramic shell admixing selected additives powdery precursor. To assign possible complex, mutual interactions additives, based full factorial design experiments. Investigations microstructure performed gas-adsorption mercury intrusion measurements enriched combining light- scanning electron microscopy respective samples. obtained significantly enhanced thermal conductivity. Cycling proven over ten cycles in laboratory scale. Due minimization contact area between core its stabilizing utilizing spherical particles, it demonstrated that only minor formation thermochemically inert side product detectable.