May 22-27, 2016
Calcium looping, a post-combustion “carbon capture and storage” process (see Figure 1), is usually carried out by means of a limestone-based sorbent in a dual interconnected fluidized bed reactor. The two stages of this process are limestone calcination and carbonation: in the former case, water vapor can be present as a product of the auxiliary fuel combustion needed to drive this endothermal step; in the latter case, water vapor is usually present in the combustion flue gas stream bearing the CO2 to be captured. This work pursues previous research concerning the hydration-induced reactivation of spent sorbents (1,2,3) further and aims at investigating the effect of the presence of water vapor on the performance of a limestone-based sorbent, with particular reference to the attrition/fragmentation tendency. To this end, experimental tests were carried out in a lab-scale apparatus, under typical operating conditions in terms of temperature and gas composition. The role of water vapor in changing the sorbent CO2 capture capacity (with respect to a base-case operation in which water vapor was absent) and the attrition/fragmentation tendency was examined (see, for example, Figure 2 up and down, respectively). Results from CO2 capture will be complemented with characterization of sorbent particles, by means of scanning electron microscopy, porosimetric and X-ray diffraction analyses.
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Fabio Montagnaro, Eduardo Gais, Antonio Coppola, Piero Salatino, and Fabrizio Scala, "Effect of steam on the performance of Ca-based sorbents in calcium looping processes" in "Fluidization XV", Jamal Chaouki, Ecole Polytechnique de Montreal, Canada Franco Berruti, Wewstern University, Canada Xiaotao Bi, UBC, Canada Ray Cocco, PSRI Inc. USA Eds, ECI Symposium Series, (2016). https://dc.engconfintl.org/fluidization_xv/32