Behavior of Ca(OH)2/CaO pellet under dehydration and hydration

Fujii, Iwane; Ishino, Masaru; Akiyama, S.; Murthy, M.S.S.; Rajanandam, K.S.

doi:10.1016/0038-092x(94)90036-1

Cited by 53 publications

(20 citation statements)

References 2 publications

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“…Pelletization can be a valid way of facilitating the handling of materials and an enhancement of the storage density for a CaO/Ca(OH) 2 /H 2 O system. In this context, Fujii et al investigated the behavior of a single Ca(OH) 2 pellet with additives of Cu, Zn, Al, and Al(OH) 3 for solar heat storage . They reported that Al‐doped samples have a higher rate of reaction than pure, Cu, and Zn doped samples, and the Al‐doped samples kept the shape during hydration.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, Fujii et al investigated the behavior of a single Ca(OH) 2 pellet with additives of Cu, Zn, Al, and Al(OH) 3 for solar heat storage. 25,26 They reported that Al-doped samples have a higher rate of reaction than pure, Cu, and Zn doped samples, and the Al-doped samples kept the shape during hydration. To improve the mechanical strength of the pellets, Criado et al investigated the composite combining sodium silicate 27 and Ca-silicate 28 with Ca(OH) 2 /CaO.…”

Section: Introductionmentioning

confidence: 99%

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Performance of thermochemical energy storage of a packed bed of calcium hydroxide pellets

et al. 2019

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Thermochemical energy storage (TCES) using reversible gas‐solid reactions is a promising technology owing to the high energy density and capability of long‐term storage. TCES using a calcium oxide/calcium hydroxide/water (CaO/Ca(OH)2/H2O) reaction system has attracted considerable attention because of the low material cost and environmental friendliness of the reactants. Previous experimental studies have focused on the TCES performances of packed beds of calcium oxide/calcium hydroxide powder. However, pelleted materials can be more favorable than powdered materials from a practical viewpoint. The aim of this study is to evaluate the performance of TCES of a packed bed of calcium oxide/calcium hydroxide pellets. In this work, a total of 60 g of calcium hydroxide pellets (diameter of 1.9 mm and length of 2‐10 mm) was evaluated using a 100‐W scale packed bed reactor. The heat storage density of the bed was 1.0 MJ L‐bed−1, and an average heat output rate of 0.71 kW L‐bed−1 was observed for the first 10 minutes under a hydration pressure of 84.6 kPa. The stability of the reaction conversion of the bed was demonstrated during 17 cycles of experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of thermochemical energy storage of a packed bed of calcium hydroxide pellets

et al. 2019

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“…Although portlandite was not detected on Figure 1, probably due to its vestigial presence, regarding Table 1, the weight losses verified between ∼390°C and 500°C might be also due to Ca(OH) 2 dehydration, since CaO can be formed ∼500°C under atmospheric pressure [17]. On Figure 1 is possible to identify calcite in samples composition.…”

Section: Ricon19 -Remine International Conferencementioning

confidence: 86%

Applying Chemometrics to Evaluate Tungsten Mining Residues Potential As Partial Cement Replacement

Almeida¹,

Silva

Faria

et al. 2020

KEG

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Electroremediation and deep eutectic solvents are well-documented clean-up processes for metals extraction from solid matrices. Depending on the purpose, these treatments may generate a residue free of pollutants and critical raw materials. Several studies were conducted to re-insert treated secondary resources in building materials. However, there is a research gap in the improvement of reactive properties of these secondary resources. In addition, there is a lack of pozzolans that can optimize cementitious materials. This study investigates the pozzolanic reactivity of tungsten mining residues after receiving electrodialytic treatment in the presence of natural deep eutectic solvents. In all cases, thermal treatment after electroremediation potentiated the pozzolanic reactivity of tungsten mining residues, between 64% to 87%. The introduction of these pozzolanic resources in cementitious-based materials may increase their performance, enlarge the range of applications in the construction industry, reduce the environmental impact, and contribute to a circular economy. Keywords: electro-based technology, tungsten mining waste, construction material, pozzolanicity.

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“…A pilot‐scale moving bed was also investigated by Schmidt et al to study the enhancement of flowability of storage materials. Fujii et al studied the properties of calcium oxide/hydroxide pellets in the development of a solar energy conversion system . Sakellariou et al studied the improvement in the mechanical durability of pelletized materials during repetitive reactions.…”

Section: Introductionmentioning

confidence: 99%

“…Fujii et al studied the properties of calcium oxide/hydroxide pellets in the development of a solar energy conversion system. 14 Sakellariou et al 15 studied the improvement in the mechanical durability of pelletized materials during repetitive reactions. Shkatulov and Aristov focused on the change in dehydration temperature, and developed composite materials with lower dehydration temperature.…”

Section: Introductionmentioning

confidence: 99%

Composite material for high‐temperature thermochemical energy storage using calcium hydroxide and ceramic foam

et al. 2019

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Thermochemical energy storage using a calcium oxide/calcium hydroxide/water (CaO/Ca(OH)2/H2O) reaction system is a promising technology for thermal energy storage at high‐temperatures (400°C‐600°C). The purpose of this study is to develop a practical composite material by enhancing heat transfer through the reaction bed and mitigating problems of pure CaO/Ca(OH)2 materials, such as formation of centimeter‐scale agglomerates and change in the bulk volume during repetitive reactions. The present study focused on a novel composite material using a silicon carbide/silicon (SiC/Si) foam. In the literature, performance of thermochemical energy storage of the composite using the ceramic foam remains unclear. In this study, we evaluated the performance of the composite material (~63 g) by a 100‐W‐scale packed bed reactor. The volumetric heat output rate (for the first 5 minutes, under maximum hydration pressure) of the composite was 1.3 kW L‐bed−1, which was 1.4 times higher than that previously reported for a bed of pure Ca(OH)2 pellets. The composite material, in which the CaO/Ca(OH)2 samples were subdivided inside pores with a mean diameter of 400 μm, retained high reactivity during cycle reactions, and maintained its bulk volume. Therefore, the composite material developed in this study shows promising application for high‐temperature thermochemical energy storage.

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Behavior of Ca(OH)2/CaO pellet under dehydration and hydration

Cited by 53 publications

References 2 publications

Performance of thermochemical energy storage of a packed bed of calcium hydroxide pellets

Performance of thermochemical energy storage of a packed bed of calcium hydroxide pellets

Applying Chemometrics to Evaluate Tungsten Mining Residues Potential As Partial Cement Replacement

Composite material for high‐temperature thermochemical energy storage using calcium hydroxide and ceramic foam

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