Exergy Analysis of Concentrated Solar Power Plants with Thermochemical Energy Storage Based on Calcium Looping

Chen, Xiaoyi; Jin, Xiaogang; Ling, Xiang; Wang, Yan

doi:10.1021/acssuschemeng.0c01586

Cited by 32 publications

(10 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The classical reaction system of CaCO 3 thermal decomposition and its reverse CaO carbonation reaction have received alternative attention toward the application of the reversible reaction for CO 2 capture and thermal energy storage technologies. − …”

Section: Introductionmentioning

confidence: 99%

Acceleration Effect of Atmospheric Water Vapor on the Thermal Decomposition of Calcium Carbonate: A Comparison of Various Resources and Kinetic Parameterizations

Tone

Hotta

Koga

2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The effect of water vapor on the thermal decomposition of five different CaCO 3 samples was investigated to reveal the origin of the acceleration effect caused by water vapor. Biomineralized CaCO 3 samples decomposed at a relatively low temperature and were limitedly sensitive to variations in atmospheric water vapor pressure (p(H 2 O)). During the thermal decomposition of the mineral and synthetic CaCO 3 samples, an acceleration effect of water vapor was observed; however, the degree of the effect differed among the samples. A sample with smaller specific surface area and larger particle size (mineral aragonite) decomposed at higher temperatures but exhibited more significant reaction temperature reduction with increasing p(H 2 O). The kinetic analysis of the thermal decomposition of CaCO 3 (mineral aragonite) under different p(H 2 O) values revealed a variation in the surface reaction (SR) kinetics with p(H 2 O), indicating the enhancement of the SR at greater p(H 2 O). The subsequent reaction proceeded through a contracting geometry scheme, during which the CaO crystal growth and pore formation in the surface product layer were enhanced by the effect of water vapor. A universal kinetic analysis for the thermal decomposition of CaCO 3 under different temperatures and p(H 2 O) values was demonstrated by introducing an accommodation function (AF) of p(H 2 O), obtaining a single set of kinetic triplets and the exponent in the AF. The effect of water vapor on the kinetics was parameterized by the exponent in the AF, which can be a potential tool for evaluating the thermal decomposition of CaCO 3 in the Ca-looping system for CO 2 absorption and energy storage.

show abstract

Section: Introductionmentioning

confidence: 99%

Acceleration Effect of Atmospheric Water Vapor on the Thermal Decomposition of Calcium Carbonate: A Comparison of Various Resources and Kinetic Parameterizations

Tone

Hotta

Koga

2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…A literature review of recent studies on the CaL system shows a profound interest in sorbent properties, reactor design and operation, process integration, and economic analyses. − Lately, there has been progress in the design of more efficient and potentially cost-effective plant schemes. Multiple options have been contemplated, such as fuel consumption and equipment size reduction, , improvement in heat transfer from hot calcination products to colder carbonation sorbents, , reactivation of the sorbent, and integration with solar technologies. ,− …”

Section: Introductionmentioning

confidence: 99%

Influence of Long-Term CaO Storage Conditions on the Calcium Looping Thermochemical Reactivity

Amghar,

Perejón,

Ortiz

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Long-term storage capability is often claimed as one of the distinct advantages of the calcium looping process as a potential thermochemical energy storage system for integration into solar power plants. However, the influence of storage conditions on the looping performance has seldom been evaluated experimentally. The storage conditions must be carefully considered as any potential carbonation at the CaO storage tank would reduce the energy released during the subsequent carbonation, thereby penalizing the round-trip efficiency. From lab-scale to conceptual process engineering, this work considers the effects of storing solids at low temperatures (50–200 °C) in a CO2 atmosphere or at high temperatures (800 °C) in N2. Experimental results show that carbonation at temperatures below 200 °C is limited; thus, the solids could be stored during long times even in CO2. It is also demonstrated at the lab scale that the multicycle performance is not substantially altered by storing the solids at low temperatures (under CO2) or high temperatures (N2 atmosphere). From an overall process perspective, keeping solids at high temperatures leads to easier heat integration, a better plant efficiency (+2–4%), and a significantly higher energy density (+40–62%) than considering low-temperature storage. The smooth difference in the overall plant efficiency with the temperature suggests a proper long-term energy storage performance if adequate energy integration is carried out.

show abstract

“…Some researchers have summarized the commercial 1 and largescale 2 application of CSP-TES plants based on calcium looping (CaL), studied the optimization of the CSP-TES system, 3 and used exergy analysis to evaluate the efficiency of CSP-TES integration. 4 It is estimated that CSP plants with TES systems have reached 70% of the total installed capacity by 2021. 5 Thermochemical energy storage (TCES) based on chemical cycle reactions has obvious advantages such as high energystorage density.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The concentrated solar power (CSP) plant-integrated thermal energy storage (TES) system has good development prospects. Some researchers have summarized the commercial and large-scale application of CSP-TES plants based on calcium looping (CaL), studied the optimization of the CSP-TES system, and used exergy analysis to evaluate the efficiency of CSP-TES integration . It is estimated that CSP plants with TES systems have reached 70% of the total installed capacity by 2021 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Vacancy Defects of the Calcium Oxide Surface on the Nonequilibrium Phase Transition of Alkali Metal Salts

et al. 2022

View full text Add to dashboard Cite

Molten alkali metal salt effectively promotes the performance of calcium looping (CaL). Deep insight into the nonequilibrium phase-transition characteristic of alkali metal salt is better for the control of the temperature in CaL, which not only ensures the complete melting of metal salt but also prevents the reaction from inhibiting caused by higher temperatures. In this work, therefore, the molecular dynamics simulation method is used to explore the nonequilibrium phase-transition characteristic of Na 2 SO 4 . The results show that the equilibrium melting temperature of nanosodium sulfate on the calcium oxide surface is 810 K, which is lower than the macroscopic melting temperature. Meanwhile, the high heating rates led to the atoms in Na 2 SO 4 unable to break through the thermal stability limit, resulting in overheating of the crystal. Both the surface premelting and overheating melting temperature of the crystal are increased. When the heating rates are 0.25, 0.5, and 1.0 K/ps, the overheating melting temperatures are 845, 885, and 930 K, respectively. More than that, the surface defects enhance the interaction between CaO and Na 2 SO 4 because of the surface being charged. The increases in the interaction not only effectively break the stability of the crystal lattice of Na 2 SO 4 on the defective surfaces but also promote the energy transport inside Na 2 SO 4 . Therefore, as the defect concentration increases from 0 to 3% and 5%, the overheating melting temperature of Na 2 SO 4 gradually decreases from 845 to 836 and 815 K.

show abstract

Exergy Analysis of Concentrated Solar Power Plants with Thermochemical Energy Storage Based on Calcium Looping

Cited by 32 publications

References 46 publications

Acceleration Effect of Atmospheric Water Vapor on the Thermal Decomposition of Calcium Carbonate: A Comparison of Various Resources and Kinetic Parameterizations

Acceleration Effect of Atmospheric Water Vapor on the Thermal Decomposition of Calcium Carbonate: A Comparison of Various Resources and Kinetic Parameterizations

Influence of Long-Term CaO Storage Conditions on the Calcium Looping Thermochemical Reactivity

Influence of Vacancy Defects of the Calcium Oxide Surface on the Nonequilibrium Phase Transition of Alkali Metal Salts

Contact Info

Product

Resources

About