Study On Adsorption And Desorption Of Carbon Dioxide On Potassium-based Sorbents In A Fluidized-Bed

Global warming has become the the common concern of environmental issues in the21st century, the greenhouse effect lead by excessive emissions of carbon dioxide is one of the major factors causing global wanning. The emission of CO2is large in the human energy system, and CO2stays a long time in the atmosphere. How to reduce CO2emissions and reduce the concentration of CO2in the atmospheric is a common challenge of human. Therefore, the development of technically and economical feasibly CO2emission reduction technologies is crucial. The study focused on fluidized bed adsorption experiments of KHCO3loading on activated carbon. The effects of the adsorption process, such as temperature, atmosphere conditions, gas flow rate and cycle performance are discussed. This study will provide the theoretical principle and experimental data of the promotion of applications for future theoretical, and is of great practical value.In the process of preparation and characterization of the adsorbents, we use nitrogen adsorption to determine the total specific surface area, micropore volume, total pore volume, average pore diameter of the potassium-based adsorbents. By XRD experiments, we analysed the changes of potassium-based adsorbents before and after absorption. Morphological changes of potassium-based adsorbents were observed with SEM.The regeneration behavior of potassium-based adsorbents was studied in the fluidized bed device, we have come to the conclution that:When the fluidized bed temperature was controlled at60℃, potassium-based sorbent can achieve good absorption. Adding an appropriate amount of water vapor pretreatment is good for absorption. When the potassium-based sorbents regenerated in the atmosphere of N2, the best regeneration temperature is200℃. After10cycles of adsorption and regeneration, the dsorption breakthrough time of potassium-based absorbent is between1.58min～2.05min, the adsorption performance is not significantly reduced. The saturated adsorptive capacity of potassium-based adsorbents was studied in this paper, it shows that:The higher the load rate of the potassium-based sorbents, the greater the saturation adsorption capacity. When the absorption temperature is60℃, the saturated adsorptive capacity of potassium-based adsorbents is63.39mg/g. After10cycles, the saturation adsorption capacity of potassium-based adsorbents range of58.53-63.39mg/g, the saturated adsorptive capacity did not significantly decreased.