High Intensity Sound Enhances Calcination and CO2 Capture of Limestone and Dolomite at Ca-Looping Conditions
2016
Ebri, J. M. P. | Valverde, J. M. | Quintanilla, M. A. S.
The calcium looping (CaL) process, based on the calcination/carbonation of CaCO₃, has emerged in the last years as a potentially low cost technology for CO₂ capture. In this work, we show that the application of high intensity sound to limestone and dolomite beds in a CaL reactor enhances significantly their multicycle CO₂ capture capacity. Experimental tests have been carried out in which pulsed sound waves are applied either during the calcination stage of each CaL cycle or in the carbonation stage. The effect of sound is to intensify the transfer of heat, mass, and momentum and becomes more marked when sound is applied during calcination by promoting CaO regeneration. The application of sound slows the decay of capture capacity with the number of cycles and, if other factors are kept equal, reduces the energy requirement to capture a unit mass of CO₂.
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