SiC/Mn co-doped CaO pellets with enhanced optical and thermal properties for calcium looping thermochemical heat storage

Li, Boyu; Li, Yingjie; Dou, Yehui; Wang, Yuzhuo; Zhao, Jianli; Wang, Tao

doi:10.1016/j.cej.2021.130305

Cited by 78 publications

(16 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The doping of optical absorption-enhanced elements (i.e., Fe, Mn, Cu, Co, and Cr) − is commonly employed to increase the solar absorption capability of CaO-based composites, as listed in Table S1. Teng et al found that ion doping of optical absorption-enhanced elements was superior to particle-doping mode in enhancing the solar absorption capability of CaO-based composites.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermochemical Energy Storage Performance of Fe-/Mn-Doped, Zr-Stabilized, CaO-Based Composites under Different Thermal Energy Storage Modes

Sun

Bai

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

CaCO3/CaO materials possess the advantages of low cost, high energy storage density, and working temperature, which offer these materials the potential to be used in thermochemical energy storage systems for concentrated solar power plants. However, CaCO3/CaO materials possess poor antisintering and optical absorption abilities, largely limiting their practicability for direct solar utilization. In this study, binary ion doping of Fe/Mn and Zr-based stabilizer incorporation were simultaneously conducted to improve the cyclic thermal energy storage/release performance of CaCO3/CaO materials. The spectral absorbance of synthetic CaO-based composites (ranging from 77.8% to 84.0%) doped with binary ions of Fe/Mn is greatly increased in comparison to that of pure CaO (∼12.2%) due to the generation of black Ca2Fe2O5 and Ca4Mn3O10. The cyclic thermal energy storage/release performances of synthetic CaO-based composites were comparatively investigated under two thermal energy storage modes (CSP-N2 and CSP-CO2). The Zr-doped, CaO-based composites exhibit a cycling stability superior to those of Zr-free CaO-based composites due to the generated inert CaZrO3 with desirable antisintering ability, and the superiority is more prominent under CSP-CO2 mode. After 50 cycles, the CaO-based composite with a molar ratio of Ca:Zr = 100:6.7 exhibits a remarkably stable energy release density of 1.02 MJ/kg under CSP-CO2 mode, retaining 88.9% of its initial energy release density.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermochemical Energy Storage Performance of Fe-/Mn-Doped, Zr-Stabilized, CaO-Based Composites under Different Thermal Energy Storage Modes

Sun

Bai

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…15,16 As a result, a dense solid layer of the product cannot be formed. The used nanoparticles mainly include TiO 2 , 17 SiO 2 , 18 MgO, 19 ZrO 2 , 20 Al 2 O 3 , 21 MnO 2 , 22 and so forth. Although the nanoinert carrier effectively isolated the absorbent, the number of reaction sites of the absorbent with the increase in the number of inert carriers declines and suppresses the efficiency of CaL.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The solid phase inert carrier produced the Zener pinning force to work on the calcium-based absorbents, causing the increases in the resistance of grain boundary migration. , As a result, a dense solid layer of the product cannot be formed. The used nanoparticles mainly include TiO 2 , SiO 2 , MgO, ZrO 2 , Al 2 O 3 , MnO 2 , and so forth. Although the nanoinert carrier effectively isolated the absorbent, the number of reaction sites of the absorbent with the increase in the number of inert carriers declines and suppresses the efficiency of CaL .…”

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

“…Therefore, combining the incorporation of structure stabilizers and granulation is a promising approach to prepare the desirable CaO-based energy storage materials for the TCES system. Li et al , proved that extrusion–spheronization was an effective granulation method to prepare the CaO-based composite pellets with stable thermal energy storage/release capability. Bai et al also found that the structurally improved, TiO 2 -incorporated CaO-based pellets prepared via extrusion–spheronization exhibited the remarkably enhanced cyclic thermal energy storage/release performance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermochemical Energy Storage Stability of CaO-Based Composite Pellets Incorporated with a Zr-Based Stabilizer

Zhou

Liu

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

Calcium looping is a potential thermochemical energy storage technology applied in a high-temperature working window. However, CaCO3/CaO materials are prone to encounter severe sintering, exhibiting poor thermal energy storage/release stability. To improve the thermochemical energy storage stability, different amounts (5, 15, and 30 wt %) of a Zr-based stabilizer were incorporated into CaCO3/CaO materials. Moreover, the graphite-casting method was adopted to prepare the Zr-stabilized, CaO-based composite pellets aiming to improve the practicability. The incorporation of the Zr-based stabilizer can effectively resist the sintering of CaO-based composite powders during a high-temperature precalcination process. It is mainly attributed to the large amounts of generated, nanosized CaZrO3 grains possessing desirable antisintering ability evenly distributed within the composites. Particularly, the Zr-stabilized, CaO-based composite pellets containing 30 wt % of CaZrO3 possess a relatively high compression strength of 2.28 ± 0.87 MPa and a desirable thermal storage density of 1.15 GJ/t after 20 cycles. Additionally, the graphite-casted, Zr-stabilized, CaO-based composite pellets have potential to be applied in a large-scale thermochemical energy storage system because the graphite-casting method is easy to be scaled-up.

show abstract

SiC/Mn co-doped CaO pellets with enhanced optical and thermal properties for calcium looping thermochemical heat storage

Cited by 78 publications

References 55 publications

Evaluation of Thermochemical Energy Storage Performance of Fe-/Mn-Doped, Zr-Stabilized, CaO-Based Composites under Different Thermal Energy Storage Modes

Evaluation of Thermochemical Energy Storage Performance of Fe-/Mn-Doped, Zr-Stabilized, CaO-Based Composites under Different Thermal Energy Storage Modes

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

Enhanced Thermochemical Energy Storage Stability of CaO-Based Composite Pellets Incorporated with a Zr-Based Stabilizer

Contact Info

Product

Resources

About