| The utilization of fossil fuels emits a large amount of CO2, Greenhouse Effect caused by which is the main reason of Global Warming. Calcium-based absorbent cyclic carbonation-calcination reactions(CCRs) have a wide application prospect among a numbers of CO2 separation technologies. In this paper, the relevant exploration and research have made based on the application of fluidized bed in CCRs process, and the variation of carbonation conversion ratio over multiple CCRs cycles and decomposition kinetics of CaCO3 in the pure CO2 atmosphere have studied with a Thermogravimetric Analyzer.The variation of carbonation conversion ratio over multiple CCRs cycles was studied with a Thermogravimetric Analyzer, compared with the fitting results by Abanades's model as the general parameters, then proposed the optimum values for the present experiment. The apparent activation energy for CaCO3 decomposition in the pure CO2 atmosphere was about 3766.8kJ/mol, the most probable mechanism function was G(α)=1-(1-α)1/2.The calcium-based absorbent from limestone over multiple CCRs cycles in a quartz-tube fluidized bed was studied experimentally. The results showed that: the reaction time of carbonation and calcination reduced when the cycle number increased. The carbonation conversion ratio reduced successively because of the specific surface area decreased and pore structure deteriorated. The CO2 concentration and sulfation reaction of absorbent in the carbonation atmosphere had influence on the carbonation conversion ratio.A cold-state experiment apparatus of fluidzed bed with internal circulation and dual connection which applied to CCRs process was established. Obtained the pressure distribution of circulation loop. The variation of solids circulation rate and pressure drop of external bubbling bed in different operating conditions were discussed. The average solid particle concentration according to the pressure drop of external bubbling bed was analyzed. |
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