Work

Optimizing the manufacturing conditions of CaO/Ca(OH)2 for thermochemical energy storage utilizing a bubbling fluidized bed to reduce particle degradation

Year: 2024

Type: article

Abstract: Thermal energy storage in the temperature range from 400 °C to 600 °C has been the focus of technological development in recent years. The thermochemical material system CaO/Ca(OH) 2 has been identified as promising due to its high storage capacity, abundant availability, and nontoxicity. When used in a fluidized bed , its low heat conductivity can be overcome, and the process scalability is increased. However, particle breakage due to chemical and mechanical stress during the cyclization operation can lead to defluidization and, with it, the end of the storage operation. This study investigates the influence of the process conditions during the production of the storage material CaO/Ca(OH) 2 from calcination of CaCO 3 on the particle stability in a lab-scale fluidized bed reactor ( d i = 80 mm, H = 350 mm, 850 °C, 4 bar). Mild conditions ( T calc < 750 °C) extend the material‘s lifetime from 25.5 to 40.5 cycles. The increase in lifetime is related to the increase in particle density and decrease of the mean pore diameter . The mild conditions are possible due to the catalytic effect of H 2 O on the reaction rate of the calcination , resulting in the reduction of the reactions’ apparent activation energy from 205.0 kJ/mol (N 2 -atmosphere) to 157.1 kJ/mol.

Source: Journal of Energy Storage

DOI: 10.1016/j.est.2024.114665

Authors: Leander Morgenstern, Florian Kerscher, Hartmut Spliethoff

Institution: Technical University of Munich

Language: English

Topic: Chemical Looping and Thermochemical Processes

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $3,030