Abstract
With the increasing demands on syngas quality during chemical looping gasification, investigations on oxygen carriers are becoming more and more significant. A new double-effect oxygen carrier is proposed to further promote the gasification process and capture the main by-product (CO2), which will improve the gasification rate and the quality of the syngas. Three kinds of Cu–Mn composite oxygen carriers modified by CaO with different content were prepared by mechanical mixing. The phase composition and surface morphology of the double-effect oxygen carriers before and after reactions were analyzed, which demonstrated the stability of reactions. Based on thermodynamic experiments, the double-effect oxygen carriers reacted in specific atmospheres to release O2, adsorb CO2, desorb CO2 and absorb O2. By changing the heating rate, reaction temperature and mass ratio of substances in the double-effect oxygen carrier, it can be concluded that increasing the heating rate can accelerate the reaction to some extent. The optimal temperature range for the double-effect oxygen carrier to release O2 and adsorb CO2 is 700–800 °C. To obtain pure CO2, the optimal temperature range for O2 absorption is 700–850 °C and for CO2 desorption is 850–950 °C. The addition of CaO can improve the O2 release velocity and O2 absorption velocity of the active phase of the double-effect oxygen carrier. The kinetic models of the O2 release, CO2 adsorption, CO2 desorption and O2 absorption reactions were established by the iso-conversional method. The O2 release reaction conforms to the one-dimensional diffusion model; the CO2 adsorption reaction conforms to the chemical reaction model (n = 3); the CO2 desorption reaction conforms to the one-dimensional diffusion model; and the O2 absorption reaction conforms to the spherical three-dimensional diffusion model.
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This research was financially supported by National Natural Science Foundation of China (52276102).
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Kun Wang conceived the idea of the study and analyzed the data; Yunwei Zhang and Xue meng interpreted the results and wrote the paper; all authors discussed the results and revised the manuscript.
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Wang, K., Zhang, Y., Xue, M. et al. Experimental and kinetic investigations of double-effect oxygen carriers for chemical looping gasification. J Therm Anal Calorim 148, 867–882 (2023). https://doi.org/10.1007/s10973-022-11781-y
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DOI: https://doi.org/10.1007/s10973-022-11781-y