Effect of milling mechanism on the CO2 capture performance of limestone in the Calcium Looping process

Abstract

* In contrast, highly energetic dry-milling combining impact and shear forces (EMAX) promotes CO 2 capture * CaO porosity and solid-state diffusion of CO 2 during carbonation are enhanced by EMAX ball mill

A study of the synergistic effects of Mn/steam on CO2 capture performance of CaO by experiment and DFT calculation

“…(b) and (c), a shift to the highest binding energy of Ca 2p and O 1s in C‐Mn‐CaO was found, which was not observed in the original CaO. It means that it was easier for the Ca atom and O atom in C‐Mn‐CaO to give electrons to CO 2 than the original CaO, which assisted the fast formation of CO 3 . The doping of Mn in CaO was beneficial to the electron transport from CaO to CO 2 , which accelerated the carbonation rates of CaO.…”

“…The generated CaCO 3 is transported to a calciner to regenerate CaO in a high‐concentration CO 2 atmosphere at a temperature above 900°C, which is realized by oxy‐fuel combustion. The carbonation and calcination reactions of CaO during the calcium‐looping process can realize the CO 2 capture and the regeneration of CaO . The schematic diagram of the calcium looping process for CO 2 capture is shown in Fig.…”

“…Natural calcium‐based sorbents like limestone, dolomite, and some calcium‐based industrial wastes like carbide slag, are used to capture CO 2 during the calcium looping process. However, the decay in the CO 2 capture capacities of calcium‐based sorbents with the number of carbonation / calcination cycles, resulting from sintering, is the major problem that limits CO 2 capture efficiency and the large‐scale industrial application of calcium looping .…”

Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent

“…The mechanochemical process provides a way to remove the outer layer of FeCO 3 ; this layer is generally nonporous. This fluidization regime allows the carbonation reaction to remain more active [14,34,35]. This is likely the reason the carbonation process did not need an extra-reducing agent, such as iron, to obtain siderite in all of the cycles, which is an advantage compared with the HTHP process, which needed metallic iron.…”

PEST study of CO2 capture strategy from 2007 to 2018

“…The oxyfuel process, which has been investigated for the effectiveness of CO2 capture in a cement plant [11], [12], as well as research and reviews of different applications, compared to other capture methods [13], [14]. These methods have been used as a way to try to reduce CO2 emissions in many applications, but using different ways of applying them, such as using ionic liquids to capture and store CO2 in processes based on monoethanolamine in the combustion gases of a power plant, reducing the energy consumed by up to 30% and reducing CO2 emissions [15], as well as using an amine impregnated silicic acid compound as an adsorbent for CO2 capture, obtaining that the desorption activation energy was 335 Kj/mol and the estimated thermal regeneration load for the absorber was 53.29 kJ/mol CO2 [16], [17], as well as for the study of CO2 capture by carbontae loop in a 1 MW plant [18], analyzes the influence of crushing on the CO2 capture yield of CaO derived from natural limestone, for which, depending on the process used to obtain CaO, CaO will have less carbonation and will have greater crystallization or greater carbonation and less crystallinity of Cao, producing more CO2 emissions [19]. Although the method is very useful for reducing emissions, it is characterized by high energy consumption, with which research was conducted to use a hybrid configuration of the CO2 capture process after combustion in thermal power plants using aqueous monoethanolamine as a simulated absorbent in Aspen Plus [20].…”