Enhancing solar absorption and reversibility in calcium looping-based energy storage via salt-promoted CaO

Choi, Dasol; Noh, Soyoung; Park, Youngjune

doi:10.1016/j.cej.2023.144036

Cited by 5 publications

(3 citation statements)

References 61 publications

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“…11 Another approach is to use Fe, Co and Ni doped CaO mixed with 10 wt% molten calcium chloride (CaCl 2 ), which showed an increase in absorption capacity rather than a decrease when performing multicycle absorption. 12 The same increase with multicycle absorption was reported for carbon capture in molten salts (CCMS), in a study where 15 wt% CaO was partially dissolved in a eutectic CaCl 2 -CaF 2 melt. The cyclic conversion of CaO to CaCO 3 was above 85 %, making it a promising capture medium.…”

Section: Introductionsupporting

confidence: 58%

A Kinetic Model of CO2 Absorption in Molten CaO-CaF2-CaCl2

IVELAND,

WESTBYE,

MARCHETTI

et al. 2024

Electrochemistry

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Post-combustion CO 2 capture is a promising method for removing CO 2 from processes where emissions cannot be mitigated by renewable energy input and where the chemical reactions required for production emit CO 2 , e.g. calcination of calcium carbonate (CaCO 3 ) for cement production. One promising capture method is carbon capture in molten salts (CCMS). CCMS is a thermal swing gas-liquid process that utilizes CaO carbonation to absorb CO 2 . The molten salt used in this work is 15 wt% CaO in eutectic CaCl 2 -CaF 2 (86.2 : 13.8 wt%). The CaCl 2 -CaF 2 -CaO system has been found to have high cyclic absorption capacity (0.6 g CO 2 /g CaO), though reaction kinetics has yet to be studied. By utilizing a novel experimental setup, data is collected, and a kinetic model is developed, which can be used in a techno-economic evaluation. The model proposes a simplified description of the CaCl 2 -CaF 2 -CaO system, with the assumption that the reaction is a first order elementary reaction where CaO and CO 2 react to form CaCO 3 without any solubility of CO 2 in the molten salt. CO 2 concentration, temperature, wt% CaO and surface area of molten salt are parameters in the proposed kinetic model. The result is a kinetic model that accurately fits the experimental data with an R 2 value above 0.98. It has been found that increasing the CO 2 concentration and decreasing the temperature yield a higher CaO to CaCO 3 equilibrium conversion.

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Section: Introductionsupporting

confidence: 58%

A Kinetic Model of CO2 Absorption in Molten CaO-CaF2-CaCl2

IVELAND,

WESTBYE,

MARCHETTI

et al. 2024

Electrochemistry

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“…A reversible reaction of interest is the calcination/carbonation of limestone (CaCO 3 CaO + CO 2 ). This reaction, which is also the basis for Calcium Looping (CaL), has been widely investigated in recent decades for post-combustion and atmospheric CO 2 capture, and for its subsequent release in concentrated form for geological sequestration or chemical reuse [18][19][20][21][22][23][24][25][26][27][28][29]. Nowadays, CaL is also of particular interest for energy purposes, thanks to the high reaction enthalpy (∆H r • = 178 kJ/mol) and low cost of the raw material.…”

Section: Overviewmentioning

confidence: 99%

Influence of Fluidised Bed Inventory on the Performance of Limestone Sorbent in Calcium Looping for Thermochemical Energy Storage

Di Lauro,

Tregambi,

Montagnaro

et al. 2023

Energies

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This research work deals with the application of the calcium looping concept for thermochemical energy storage. Experiments were carried out in a lab-scale fluidised bed reactor, which was electrically heated. An Italian limestone (98.5% CaCO3, 420–590 μm) was present in the bed alone, or in combination with silica sand/silicon carbide (this last material was chosen as per its high absorption capacity in the solar spectrum). Calcium looping tests (20 calcination/carbonation cycles) were carried out under operating conditions resembling the “closed-loop” scheme (calcination at 950 °C, carbonation at 850 °C, fluidising atmosphere composed of pure CO2 in both cases). Carbonation degree, particle size distribution, and particle bulk density were measured as cycles progressed, together with the application of a model equation to relate carbonation degree to the number of cycles. Mutual relationships between the nature of the bed material and possible interactions, the degree of CaO carbonation, the generation of fragments, and changes in particle density and porosity are critically discussed. An investigation of the segregation behaviour of the bed material has been carried out through tests in a devoted fluidisation column, equipped with a needle-type capacitive probe (to measure solid concentration).

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“…Thermochemical energy storage, characterized by high energy density, wide operating temperature range, and long-term storage, is the most suitable option for energy storage systems in new-generation CSP power plants. 8,9 The main thermochemical energy storage systems include amino energy storage, 10,11 metal hydride energy storage, 12–14 carbonate energy storage, 15,16 metal oxide energy storage, 17–21 and hydroxide energy storage. 22–24 The metal oxide system realizes the storage and release of heat through the reversible transformation (redox) of the metal ions' valence.…”

Section: Introductionmentioning

confidence: 99%

Understanding the modulation mechanism of B-site doping on the thermochemical properties of CaMnO_3−δ: an experimental and computational study

Ning,

Gan,

et al. 2024

J. Mater. Chem. A

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Enhancing solar absorption and reversibility in calcium looping-based energy storage via salt-promoted CaO

Cited by 5 publications

References 61 publications

A Kinetic Model of CO<sub>2</sub> Absorption in Molten CaO-CaF<sub>2</sub>-CaCl<sub>2</sub>

A Kinetic Model of CO<sub>2</sub> Absorption in Molten CaO-CaF<sub>2</sub>-CaCl<sub>2</sub>

Influence of Fluidised Bed Inventory on the Performance of Limestone Sorbent in Calcium Looping for Thermochemical Energy Storage

Understanding the modulation mechanism of B-site doping on the thermochemical properties of CaMnO_3−δ: an experimental and computational study

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Enhancing solar absorption and reversibility in calcium looping-based energy storage via salt-promoted CaO

Cited by 5 publications

References 61 publications

A Kinetic Model of CO<sub>2</sub> Absorption in Molten CaO-CaF<sub>2</sub>-CaCl<sub>2</sub>

A Kinetic Model of CO<sub>2</sub> Absorption in Molten CaO-CaF<sub>2</sub>-CaCl<sub>2</sub>

Influence of Fluidised Bed Inventory on the Performance of Limestone Sorbent in Calcium Looping for Thermochemical Energy Storage

Understanding the modulation mechanism of B-site doping on the thermochemical properties of CaMnO3−δ: an experimental and computational study

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Understanding the modulation mechanism of B-site doping on the thermochemical properties of CaMnO_3−δ: an experimental and computational study