CaO/Ca(OH)2 thermochemical heat storage of carbide slag from calcium looping cycles for CO2 capture

Yuan, Yazhou; Li, Yingjie; Duan, Lunbo; Liu, Hantao; Zhao, Jianli; Wang, Zeyan

doi:10.1016/j.enconman.2018.08.021

Cited by 62 publications

(19 citation statements)

References 33 publications

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“…TCES has an inherently larger energy density, higher working temperature, and the possibility of storing energy indefinitely with negligible thermal losses compared to TES [12]. A diverse set of materials, such as metal oxides [11], sulfates [13,14], hydroxides [15][16][17], and carbonates [18,19], have been proposed for TCES. Among them, one of the most promising candidates is calcium carbonate based on the calcium looping (CaL) process [20], because of its advantages including a high working temperature (~850 °C), high energy density (~3.2 GJ/m 3 ), and high thermal conductivity [21].…”

Section: Introductionmentioning

confidence: 99%

Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants

Wang

Clough

et al. 2020

Chemical Engineering Journal

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The reversible CaO/CaCO3 carbonation reaction (CaL) is one of the most promising candidates for high-temperature thermochemical energy storage (TCES) in concentrated solar power plants (CSP). Here, a sacrificial citric acid-based carbon template was developed to produce high-performance CaO-based sorbents to mitigate the progressive deactivation with sequential carbonation-calcination cycling. The carbon template was formed through in situ pyrolysis of citric acid in a simple heating process under nitrogen. After a secondary calcination step in air, a stable porous MgOstabilized nano-CaO powder was generated and achieved high long-term effective conversion due to its resistance to pore plugging and sintering. By dry mixing citric acid with limestone-dolomite mixtures, this procedure can also be applied to synthesize MgO-stabilized CaO pellets via an extrusion-spheronization route, which resulted in comparably stable and effective conversion as the optimized CaO powder. Additionally,

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Section: Introductionmentioning

confidence: 99%

Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants

Wang

Clough

et al. 2020

Chemical Engineering Journal

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“…Our results showed that carbide slag exhibits good CO 2 capture and CaO/Ca(OH) 2 THS performances in the coupled system shown in Fig. 1 32 …”

Section: Introductionmentioning

confidence: 59%

“…During multiple CO 2 capture cycles, large amounts of CaO‐based materials are discharged from the calciner because of the low CO 2 capture activity, which could also be used in the CaO/Ca(OH) 2 THS system. In a previous study, 32 we investigated the hydration and dehydration performances of carbide slag, which was a type of industrial waste composed mainly of Ca(OH) 2 , that experienced multiple CO 2 capture cycles. A novel coupled system that integrated CO 2 capture and CaO/Ca(OH) 2 THS was proposed, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Sun

Yan

et al. 2020

Greenhouse Gases

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CaO/Ca(OH) 2 thermochemical heat storage (THS) technology is considered to be one of the most promising technologies for large-scale solar energy storage. However, the THS performance of raw CaO-based materials decreases during multiple cycles. In this work, CaO derived from calcium acetate (Ac-CaO) is prepared and applied to a coupled system that achieved simultaneous CaO/Ca(OH) 2 THS and CO 2 capture. The CO 2 capture and THS performances of Ac-CaO are always higher than those of calcined limestone owing to the preferable pore structure, whereas Ac-CaO exhibits decreasing CO 2 capture and THS performance resulting from sintering and the formation of CaCO 3 from CaO or Ca(OH) 2 with ambient CO 2 during air cooling, respectively. In the coupled CaO/Ca(OH) 2 THS and CO 2 capture system, Ac-CaO is subjected to 10 CO 2 capture cycles, 30 THS cycles, 1 CO 2 capture cycle, 10 THS cycles, 1 CO 2 capture cycle, and 10 THS cycles sequentially. The hydration and dehydration conversions of Ac-CaO in the 31st THS cycle reach 91.7 and 93.6%, respectively, which are 1.6 and 1.6 times higher than those recorded prior to the 11th CO 2 capture cycle owing to the decomposition of CaCO 3 during calcination. The carbonation conversion of Ac-CaO achieves 89.9% in the 11th CO 2 capture cycle, which is 22.3% higher than that recorded prior to the 10 THS cycles owing to reactivation from the hydration process during THS. The CO 2 capture and CaO/Ca(OH) 2 THS processes are enhanced in the coupled system using Ac-CaO; therefore, the coupled system appears promising for CaO/Ca(OH) 2 THS and CO 2 capture.

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“…Consequently, these materials have been used for carbon capture and thermal heat storage. M(OH) 2 materials and other members of this family (i.e., Cd(OH) 2 , Ni(OH) 2 , Zn(OH) 2 ) have the potential to contribute to the worldwide goal of decarbonization through carbon capture and storage, which would help to protect our planet from the catastrophic effects of climate change [84,85,86].…”

Section: Discussionmentioning

confidence: 99%

A First-Principles Study on Electronic, Thermodynamic, and Dielectric Properties of Monolayer Ca(OH)2 and Mg(OH)2

Osanloo¹,

Oyekan²,

Vandenberghe³

2022

Preprint

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We perform first-principles calculations to explore electronic, thermodynamic, and dielectric properties of two-dimensional (2D) layered, alkaline-earth hydroxides Ca(OH) 2 and Mg(OH) 2 .We calculate the lattice parameters, exfoliation energies, and phonon spectra of monolayers and also investigate the thermal properties of these monolayers such as Helmholtz free energy, heat capacity at constant volume, and entropy as a function of temperature. We employ Density Functional Perturbation Theory (DFPT) to calculate the in-plane and out-of-plane static dielectric constant of the bulk and monolayer samples. We compute the bandgap and electron affinity values using the HSE06 functional and estimate the leakage current density of transistors with monolayer Ca(OH) 2 and Mg(OH) 2 as dielectrics when combined with HfS 2 and WS 2 , respectively. Our results show that bilayer Mg(OH) 2 (EOT ∼ 0.60 nm) with a lower solubility in water, offers higher out-of-plane dielectric constants and lower leakage currents than bilayer Ca(OH) 2 (EOT ∼ 0.56 nm). Additionally, the out-of-plane dielectric constant, leakage current, and EOT of Mg(OH) 2 outperform bilayer h-BN. We verify the applicability of Anderson's rule, and conclude that bilayers of Ca(OH) 2 and Mg(OH) 2 respectively paired with lattice-matched

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CaO/Ca(OH)2 thermochemical heat storage of carbide slag from calcium looping cycles for CO2 capture

Cited by 62 publications

References 33 publications

Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants

Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

A First-Principles Study on Electronic, Thermodynamic, and Dielectric Properties of Monolayer Ca(OH)2 and Mg(OH)2

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CaO/Ca(OH)2 thermochemical heat storage of carbide slag from calcium looping cycles for CO2 capture

Cited by 62 publications

References 33 publications

Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants

Porous MgO-stabilized CaO-based powders/pellets via a citric acid-based carbon template for thermochemical energy storage in concentrated solar power plants

Coupled CO2 capture and thermochemical heat storage of CaO derived from calcium acetate

A First-Principles Study on Electronic, Thermodynamic, and Dielectric Properties of Monolayer Ca(OH)2 and Mg(OH)2

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Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate