Suppression of Natural Limestones Deactivation During Cyclic Carbonation
Suppression of Natural Limestones Deactivation During Cyclic Carbonation
Abstract The paper provides the sorption properties of limestones that have different levels of calcium carbonate. The sorption capacities change in cyclic calcinations as well as carbonations were studied using a laboratory apparatus using a vertical quartz reactor. The use of suitable limestones and processing conditions provided an endurance of that could reach 11kg CO2 per 100 kg of limestone. A method of reactivating the wasted limestone by with an aqueous gas saturated by water vapor was suggested to prevent the loss of capacity of the looping of carbonate. I. INTRODUCTION This research focuses on the use of limestones in high-temperature separation of CO2 from flue gas in carbonate looping. Post-combustion capture of CO2 from coal-fired power stations and district heat-plants was deemed the most appropriate application for carbonate looping. A simplified scheme of the process that is based on research literature [1], can be seen in Fig. 1. While carbonate looping is yet to be a technology that njmcdirecting.com has been expanded into industrial use There are a few pilot units operating around the globe. Alonso et al. presented the main findings of an operation at the plant utilizing CaO looping, which is integrated into an installation that burns biomass the form of a fluidized bed reactor [22. Utilization of CaO based sorbents to aid in high-temperature separation of CO2 in industrial operations has been the focus of relatively many studies. The economic viability of these materials makes them attractive candidates to solve problems related to the suppression of CO2 emissions to the atmospheric air. One of the major obstacles for the use of CaO-based sorbents in suncity industrial process is the slow decline in sorption capacity that is evident in the repeating cycles of the process of calcination (i.e. the process of thermal carbonation) as well as carbonation. Based on the results of experiments, Abanades proposed an equation (1) that describes the relationship on the TechBlog conversion of CaO into CaCO3 upon the amount of cycle [33. (1) In (1) the meaning of the symbols is as follows the meaning of xN is: xN represents the conversion of N-th cycle, the constants fm and fw are. The formula was in good agreement with the data from experiments in many conditions, but its validity was limited up to 20 cycles. In their research, Wang and Anthony thus proposed a new formula that was valid for a wide range of cycles. The authors considered a mix of thermal sintering and other irreversible processes, like the growth of crystals and the reaction with CaO with impurities present in the gas, as significant causes for the decrease in capacity of CaO-based sorbents. They also argued that the rate of degradation isn't significantly dependent on the experiment conditions [44.

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