Chemical CSP storage system based on a manganese aluminium spinel

Performance of an Indirect Packed Bed Reactor for Chemical Energy Storage

“…The TES thermophysical and kinetics properties are reported in Table 1 [30]. Air was assumed both as reactant through the packed bed at about 1 bar (HTF2), and, according to the scientific literature for similar applications [32], pressurized at 10 bar as heat transfer fluid in the heat exchanger channels (HTF1).…”

“…To obtain significant data from the simulation activities, it was necessary to consider stable pelletized thermochemical TES materials, with available experimentally validated thermophysical data. For this reason, a manganese/aluminum spinel was selected, according to the work of Morabito et al [ 30 ], which presents low cost and toxicity along with a discharging temperature that allows to operate with very efficient heat/electricity power conversion blocks. The TES charging/discharging cycles are temperature-controlled, meaning that both processes are carried out at the same oxygen pressure [ 30 ], following the reaction: …”

“…Although this configuration is advantageous concerning energy transfer efficiency, it presents limitations about the allowable HTF mass flow, which is related to the storage thermal power. In fact, the pressure drop inside a packed bed is plainly a function of the particle size and the HTF linear velocity [ 30 ]; therefore, a decrease in the former parameter leads to an increase in energy density but also to constraints for the maximum permitted HTF flow rate. As a consequence, unless unrealistic geometries are considered with very large flow sections and short reaction/heat transfer paths, it can be supposed that an indirect configuration could be preferable for packed beds.…”

“…So far, no similar configurations were proposed for applications at temperatures above 500 °C; therefore, the purpose of this work was to analyze the fluid-dynamic behavior of a heat exchanger/reactor employing an oxide based thermochemical system. In this respect, it was necessary to consider a TES synthesized and characterized as pellets of proper size, and, for this purpose, a non-toxic and cost-effective manganese aluminum spinel was selected [ 30 ].…”

The EU Training Network for Resource Recovery through Enhanced Landfill Mining—A Review

“…Consequently, within NEW-MINE, MgO-stabilized SrO was synthesized and successfully tested for heat storage via the SrO/SrCO 3 cycle [102]. This research was considered outside NEW-MINE with respect to radiation propagation in a heat exchanger transforming solar radiation into high-temperature heat [103], thermochemical energy storage in the CaO/CaCO 3 [104] [105] system and two reviews on thermochemical energy storage [106,107]. The most recent NEW-MINE publication in this field deals with thermochemical heat storage via the CuO/Cu 2 O redox cycle and describes the synthesis of granules with a gravimetric energy storage density in the range of 470 to 615 kJ kg −1 [108].…”