Multiple approaches for large-scale CO₂ capture by adsorption with 13X zeolite in multi-stage fluidized beds assessment

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Prado, D. S. ; Vilarrasa-Garcia, E. ; Sampronha, E. ; Beleli, Y. S. ; Moreira, F. S. ; Paiva, J. L. ; Le Roux, G. A. C. ; Bastos-Neto, M. ; Azevedo, D. C. S. ; Silva, E. C. N. ; Seckler, M. M.

• Tipo de documento: Artigo Científico
• Fonte: ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY; v. 30, n. 5, p. 27-pg., 2023-11-06.

Resumo

Adsorption is a promising technology for reducing CO2 emissions from combustion gases. However, some issues must be considered when designing large-scale units with low environmental impact and cost. In this contribution, some of these issues are addressed. Firstly, sugarcane bagasse is selected as a meaningful model system. 13XBF Kostrolith zeolite is used as the adsorbent, and adsorption equilibrium data are determined using a magnetic suspension balance from Rubotherm. 13XBF showed a high CO2 capacity and CO2/N-2 selectivity under post-combustion scenario conditions. Secondly, the fluidized bed process was optimized using a 3-stage adsorber and a 3-stage desorber, with heat exchangers that can be used in each stage. The constrained variable in the adsorption column is the solid-to-gas mass feed ratios. It was found that substantial CO2 recovery with 98% purity can be achieved and that the heat load in the desorption column accounts for the highest energy-optimized cost in the process. Thirdly, a detailed CFD model for the fluid dynamics and heat transfer of fluidization for one stage is presented. Bubbles were defined using a hyperbolic filter as predicted by the model, which was consistent with the semi-empirical model and emphasized the significance of bubble size in gas-solid heat transfer, which is essential to the effectiveness of adsorption/desorption. The bubble portion and its effects on the temperature are estimated. Finally, a semi-empirical approach is applied to understanding the controlling factors in a fluidized bed adsorption stage. Results show that the mass transfer from the bubbles to the emulsion is likely the most important resistance to the fluidized adsorber. (AU)

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