Thermodynamics of Ca(OH)2/CaO reversible reaction: Refinement of reaction equilibrium and implications for operation of chemical heat pump

Gupta, Aman; Armatis, Paul D.; Sabharwall, Piyush; Fronk, Brian M.; Utgikar, Vivek

doi:10.1016/j.ces.2020.116227

Cited by 25 publications

(3 citation statements)

References 18 publications

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“…The thermal power produced from PC paste and modified PC pastes using SF, BHD, and combinations of these additives at a w/b ratio of 0.45 is graphically illustrated in Figure 7. The thermal power of all mixtures significantly increased to reach the 1 st peak mostly due to the reaction of C3S in the presence of water leading to the formation of calcium hydroxide, which is known as an exothermal reaction [51]. These exothermal reactions contribute to thermal generation in the mixtures during the hydration process of the cement paste.…”

Section: Isothermal Calorimetry Analysismentioning

confidence: 99%

The Effect of Baghouse Dust from Secondary Aluminum Processing Waste on Cement Hydration and Mechanical Properties

Torfin,

Byrd,

Huynh

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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This work studies the mechanical and chemical effects of utilizing baghouse dust (BHD) from secondary aluminum processing waste as a cement additive for potential use in concrete materials. The baghouse dust was added to cement pastes at replacements of 4 % and 8 % by cement mass. In addition, a combination of BHD and silica fume at different blended ratios were added to the cement mixture as a combined additive. Some reference proportions were also prepared for a comprehensive comparison. Unconfined compressive strength and the chemical composition of the extracted pore solution of the abovementioned hardened cement pastes were investigated. In addition, the effect of BHD on the hydration characteristics of the cement paste was also observed through isothermal calorimetry. It was found that an 8 % substitution of cement by BHD resulted in increased compressive strength after 1 day and 3 days of curing and a reduction of less than 2 % at 7 days of curing. Comparatively, samples with 8 % silica fume resulted in a strength increase of 17 %. As such, it was concluded that BHD addition of up to 8 % was not detrimental to concrete strength but did not improve performance either. This finding was supported by isothermal calorimetry data, which showed that the addition of BHD and the addition of silica fume both increased the initial peak of hydration and accelerated the hydration process but did not significantly impact the total energy of hydration over a period of 7 days. Finally, the high chloride content in BHD may promote corrosion in steel bars and increase concrete scaling potential.

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Section: Isothermal Calorimetry Analysismentioning

confidence: 99%

The Effect of Baghouse Dust from Secondary Aluminum Processing Waste on Cement Hydration and Mechanical Properties

Torfin,

Byrd,

Huynh

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…When energy is needed, the metal oxide is reacted with H 2 O (hydrated) and form metal hydroxide by releasing the stored energy. Calcium hydroxide (Ca(OH) 2 ) and Mg hydroxide (Mg(OH) 2 ) are the most commonly studied materials for TCS applications (Afflerbach et al, 2021;Gupta et al, 2021Gupta et al, , 2021aLi et al, 2021;Wang & Chen, 2020). Ca-and Mg-based hydroxides were initially tested by cycling study over 200 and 500 cycles, respectively, by Ervin (1977).…”

Section: Thermochemical Energy Storagementioning

confidence: 99%

A review on high‐temperature thermochemical heat storage: Particle reactors and materials based on solid–gas reactions

Bellan

Kodama

Gokon

et al. 2022

WIREs Energy & Environment

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In order to produce electricity beyond insolation hours and supply to the electrical grid, thermal energy storage (TES) system plays a major role in CSP (concentrated solar power) plants. Current CSP plants use molten salts as both sensible heat storage media and heat transfer fluid, to operate up to 560 C. To meet the future high operating temperature and efficiency, thermochemical storage (TCS) emerged as an attractive alternatives for next generation CSP plants. In these systems, the solar thermal energy is stored by endothermic reaction and subsequently released when the energy is needed by exothermic reversible reaction. This review compares and summarizes different thermochemical storage systems that are currently being investigated, especially TCS based on metal oxides. Various experimental, numerical, and technological studies on the development of particle reactors and materials for hightemperature TCS applications are presented. Advantages and disadvantages of different types heat storage systems (sensible, latent, and thermochemical), and particle receivers (stacked, fluidized, and entrained), have been discussed and reported.

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“…Funayama et al [18] used 60 g of calcium hydroxide pellets to enhance the temperature of the Ca(OH)2/CaO dehydration-hydration cycle, and the heat storage density of the bed was calculated assuming constant reaction enthalpy. The influence of temperature dependence on thermodynamic characteristics and reaction equilibrium was investigated by Gupta et al [19] theoretically and temperature amplification was observed experimentally in a 300-g packed bed reactor [20]. Most of the above studies focused on the thermochemical energy storage aspect of Ca(OH)2/CaO reaction system.…”

Section: Chemical Heat Pumpmentioning

confidence: 99%

Preliminary Pilot-scale Study and Techno-economic Analysis of Chemical Heat Pump with Conventional Nuclear Reactors

Gupta

Sabharwall

Utgikar

2022

Self Cite

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The energy economy is continually evolving, particularly in terms of primary energy sources, their conversions to useful forms such as electricity and heat, and their utilization in different sectors, in response to socio-political factors. Because nuclear source is clean and non-carbon-emitting energy source, it is crucial to consider its role in the evolution of the energy economy. A pilot-scale study was conducted for Chemical Heat Pump (ChHP) system at three different scales (25-, 100-, and 1000-kW thermal outputs) using steady state thermal model. To establish the viability of selling heat rather than electricity alone, technoeconomic analysis was undertaken for advanced Small Modular Reactor (SMR), and SMR paired with varied thermal output ChHP systems was referred to as the nuclear hybrid energy system (NHES) in this study. Using the U.S. Energy Information Administration statistics, pricing for electricity and natural gas were anticipated for U.S. regions (California, Northwest, Midwest, Southwest, New England, and PJM -Pennsylvania, New Jersey, and Maryland). Based on thermal output from ChHP, advanced SMR with 100 MWth and four alternative NHES scenarios were explored, namely 50-, 10-, 5-, and 1-MWth. Net present value, payback period, discounted cash flow return, and levelized cost of energy were evaluated for all scenarios. Based on the economic analysis, selling heat to high-temperature industrial processes is more profitable compared to selling electricity only. Higher carbon taxes showed significant improvement in economic parameters for NHESs. Providing heat to high-temperature industries could be beneficial, helping to reduce the greenhouse gas emissions by slashing the fossil fuel consumption. vi

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Thermodynamics of Ca(OH)2/CaO reversible reaction: Refinement of reaction equilibrium and implications for operation of chemical heat pump

Cited by 25 publications

References 18 publications

The Effect of Baghouse Dust from Secondary Aluminum Processing Waste on Cement Hydration and Mechanical Properties

The Effect of Baghouse Dust from Secondary Aluminum Processing Waste on Cement Hydration and Mechanical Properties

A review on high‐temperature thermochemical heat storage: Particle reactors and materials based on solid–gas reactions

Preliminary Pilot-scale Study and Techno-economic Analysis of Chemical Heat Pump with Conventional Nuclear Reactors

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