Thermochemical energy storage concept based on a fluidized bed reactor cascade with different storage materials
Thermochemical energy storage is a novel thermal energy storage technology that offers high energy density per volume and nearly loss-free storage at ambient temperature. The concept is based on the utilization of reversible reactions to store and release heat.
Fluidized bed reactors are promising for this application because they offer high heat transfer coefficients and isothermal operating conditions. Although isothermal operation is advantageous for the reaction, it is also desired to cool the waste heat source, which cannot be achieved if the reaction occurs at a high temperature level. On the other hand if a reaction at low temperature level is chosen, the exergy losses of the process would rise significantly. A cascaded storage concept consisting of 2 or more reactions leads to an efficient energy storage process with low exergy loses
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The implementation of an additional reactor in the first stage in which a portion of the produced calcium oxalate (CaC2O4) from the last stage is hydrated has apart of the supplemental heat provided to the system, the effect of absorbing a portion of the water in the fluidization gas. The water that has to be removed from the gas stream amounts to a significant portion of the process losses, therefore this configuration leads to a more efficient utilization of the heat source.
- Efficient waste heat recovery
- Cascaded arrangement leads to high energy and exergy recovery
- Water absorbtion at high temperature levels
- Heat Recovery
- Energy Storage
StichworteWaste Heat Recovery, Thermochemical Energy Storage, Magnesium Oxide, Calcium Oxide, Calcium Oxalate, Fluidized Bed Reactors