Validated model of thermochemical energy storage based on cobalt oxides

Zhou, Xin; Mahmood, Mariam; Chen, Jinli; Yang, Tianfeng; Xiao, Gang; Ferrari, Mario L.

doi:10.1016/j.applthermaleng.2019.113965

Cited by 25 publications

(8 citation statements)

References 26 publications

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“…Cobalt oxide based TCES systems have demonstrated the best performances among pure metal oxides, with high enthalpy and excellent cycling stability (Figure 7a), and are attracting attention for pilot scale tests [99]. However, this still leaves room for improvement and attempts to reduce the material cost and toxicity via the synthesis of mixed oxides [81,[85][86][87]100]. In addition, the temperature gap between the reduction and oxidation step could be reduced with the same approach (Figure 7b).…”

Section: Tces Systems Based On Metal Oxidesmentioning

confidence: 99%

Recent Advances in Thermochemical Energy Storage via Solid–Gas Reversible Reactions at High Temperature

André

Abanades

2020

Energies

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The exploitation of solar energy, an unlimited and renewable energy resource, is of prime interest to support the replacement of fossil fuels by renewable energy alternatives. Solar energy can be used via concentrated solar power (CSP) combined with thermochemical energy storage (TCES) for the conversion and storage of concentrated solar energy via reversible solid–gas reactions, thus enabling round the clock operation and continuous production. Research is on-going on efficient and economically attractive TCES systems at high temperatures with long-term durability and performance stability. Indeed, the cycling stability with reduced or no loss in capacity over many cycles of heat charge and discharge of the material is pursued. The main thermochemical systems currently investigated are encompassing metal oxide redox pairs (MOx/MOx−1), non-stoichiometric perovskites (ABO3/ABO3−δ), alkaline earth metal carbonates and hydroxides (MCO3/MO, M(OH)2/MO with M = Ca, Sr, Ba). The metal oxides/perovskites can operate in open loop with air as the heat transfer fluid, while carbonates and hydroxides generally require closed loop operation with storage of the fluid (H2O or CO2). Alternative sources of natural components are also attracting interest, such as abundant and low-cost ore minerals or recycling waste. For example, limestone and dolomite are being studied to provide for one of the most promising systems, CaCO3/CaO. Systems based on hydroxides are also progressing, although most of the recent works focused on Ca(OH)2/CaO. Mixed metal oxides and perovskites are also largely developed and attractive materials, thanks to the possible tuning of both their operating temperature and energy storage capacity. The shape of the material and its stabilization are critical to adapt the material for their integration in reactors, such as packed bed and fluidized bed reactors, and assure a smooth transition for commercial use and development. The recent advances in TCES systems since 2016 are reviewed, and their integration in solar processes for continuous operation is particularly emphasized.

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Section: Tces Systems Based On Metal Oxidesmentioning

confidence: 99%

Recent Advances in Thermochemical Energy Storage via Solid–Gas Reversible Reactions at High Temperature

André

Abanades

2020

Energies

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“…The results suggest that the heat transfer through the reaction bed was enhanced by the Si-SiC honeycomb support. Zhou et al [18] [19,20]. Ranjha and Oztekin [21] performed a numerical analysis of a three-dimensional bed with Ca(OH) 2 /CaO as the reaction pair.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a K2CO3-based thermochemical energy storage system using a honeycomb structured heat exchanger

Kant

Shukla

Smeulders

et al. 2021

Journal of Energy Storage

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“…However, the medium reaction temperatures might constrain its applicability in advanced CSP plants with higher operating temperatures [5]. Many metal oxides including BaO 2 [24], Co 3 O 4 [25], and perovskites ABO 3 [26] have been investigated for solar TCES. Their energy densities are relatively lower than other gas−solid reactions.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Enhancement of an Ammonia-Based Solar Thermochemical Energy Storage System Implemented with Hydrogen Permeation Membrane

et al. 2021

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The ammonia-based solar thermochemical energy storage (TCES) is one of the most promising solar TCESs. However, the solar-to-electric efficiency is still not high enough for further commercialization. The efficiency is limited by the high ammonia decomposition reaction temperature, which does not only increase the exergy loss through the heat recuperation but also causes a large re-radiation loss. Nonetheless, lowering the reaction temperature would impact the conversion and the energy storage capacity. Thanks to the recent development of the membrane technology, the hydrogen permeation membrane has the potential to enhance the conversion of ammonia decomposition under the moderate operating temperature. In this paper, an ammonia-based solar thermochemical energy storage system implemented with hydrogen permeation membrane is proposed for the first time. The system model has been developed using the Aspen Plus software implemented with user-defined Fortran subroutines. The model is validated by comparing model-generated reactor temperatures and conversions profiles with data from references. With the validated model, an exergy analysis is performed to investigate the main exergy losses of the system. Furthermore, the effects of the membrane on system efficiency improvement are studied. The results show that exergy loss in the charging loop is dominant, among which the exergy losses of Heat Exchanger Eh,A, together with that of the re-radiation Er, play important roles. Compared with the conventional system, i.e., the system without the membrane, the Eh,A and Er of the proposed system are more than 30% lower because the hydrogen permeation membrane can improve ammonia conversion at a lower endothermic reaction outlet temperature. Consequently, the proposed system, presumably realized by the parabolic trough collector at ~400 °C, has a theoretical solar-to-electric efficiency of ηste, which is 4.4% higher than the conventional ammonia-based solar thermochemical energy storage system. Last but not least, the efficiency is 3.7% higher than that of a typical parabolic trough solar power plant, which verifies the thermodynamic feasibility of further commercialization.

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Validated model of thermochemical energy storage based on cobalt oxides

Cited by 25 publications

References 26 publications

Recent Advances in Thermochemical Energy Storage via Solid–Gas Reversible Reactions at High Temperature

Recent Advances in Thermochemical Energy Storage via Solid–Gas Reversible Reactions at High Temperature

Performance analysis of a K2CO3-based thermochemical energy storage system using a honeycomb structured heat exchanger

Efficiency Enhancement of an Ammonia-Based Solar Thermochemical Energy Storage System Implemented with Hydrogen Permeation Membrane

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