The thermal stability of binary alkali metal nitrates

Abe, Osami; Utsunomiya, Taizo; Hoshino, Yo

doi:10.1016/0040-6031(84)87150-6

Cited by 21 publications

(5 citation statements)

References 16 publications

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“…Further examination Figure 4 reveals that in pure NaNO 3 melt NO and O 2 almost simultaneously start to be formed at approximately 450 C, and become appreciable at temperatures higher than 550 C, which is inconsistent with a previous study. 26 As suggested by Hoshino et al the main decomposition reactions of NaNO 3 could be described as follows [26][27][28]…”

Section: The Oxidation Behavior Of Nanomentioning

confidence: 99%

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A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO₃ binary system

et al. 2012

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A new method using NaOH-NaNO 3 binary melts to treat vanadium slag is proposed. Vanadium and chromium can be simultaneously extracted in the leaching processes. Under the optimum reaction conditions, the recovery of vanadium and chromium can reach 93.7% and 88.2% in 6 h, respectively. The kinetics investigation indicates that the decomposition of vanadium slag is controlled by mass transfer in product layer. During the reaction, NaOH is believed to provide basic media and facilitate the dissolution of acidic oxides. NaNO 3 decomposes to produce a large amount of active oxygen species, such as O, O 2À 2 , and O 2À . NaOH intensifies the decomposition of NaNO 3 to NaNO 2 , but inhibits further decomposition of NaNO 2 . NaNO 3 can be regenerated by oxidation of NaNO 2 using oxygen at high temperature. The apparent activation energy of NaNO 2 oxidation in the temperature ranging from 350 to 450 C is 105.5 kJ/mol. Figure 16. Flow sheet for the leaching and recovery of vanadium and chromium.

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Section: The Oxidation Behavior Of Nanomentioning

confidence: 99%

“…It is because the NAO bond in NO À 3 is significantly polarized by OH À in NaOH melt, and NO À 3 becomes more prone to decompose with increase of temperature. 28 Moreover, there is equilibration of OH À and O 2À in NaOH molten salt, 29…”

Section: The Oxidation Behavior Of Nanomentioning

confidence: 99%

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO₃ binary system

et al. 2012

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“…Salt at temperature above the stability limit is in contact with common materials such as stainless steels and nickel alloys, there is an extensive corrosion with the release of nitrogen oxides due to the reaction between the solar salt and chromium to form chromates (Nissen and Meeker, 1983).In addition, up to 620 °C there is a thermal decomposition of the solar salt that increases the tube corrosion (Abe et al, 1984). The maximum allowable film temperature is defined as the parameter that drastically increases the corrosion rate.…”

Section: Maximum Film Temperature and Thermal Stressmentioning

confidence: 99%

Flow patterns of external solar receivers

et al. 2015

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The design of flow paths of solar-central external-receiver with molten salt as heat transfer fluid is crucial to increase the solar plant availability and for the secure receiver operation with respect to the material failure. The parameters that most affect the start-up and shut-down of the receiver are the direct normal irradiance, the sun elevation angle, and the ambient conditions. In addition, the limits of the feed-pump system and the minimum turbulent Reynolds number also limit the hours of operation to avoid receiver damage. Under nominal  : Nusselt coefficient for transition regime.

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“…One of the key challenges is that the optical and thermal performance cannot be optimized independently. Also, structural stresses or corrosion inside the tubes can cause receiver failure [1][2][3], while pressure drop and flow stability inside the tubes can lead to operational issues [2,4]. Therefore, it is essential to integrate all these calculations into the design process to achieve the desired performance.…”

Section: Introductionmentioning

confidence: 99%

Field and Central Receiver Design Methodology based on Multi-Parameter Optimization by the Design of Experiments (DOE) Technique

Barbero

Ortega

Rovira

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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This manuscript presents a novel methodology for the design of Central Tower Receivers (CTR), which involves simplified models for optical and thermal calculations and evaluation of design constraints. The proposed methodology optimizes the total yearly energy production as the criterion, considering a multiparameter analysis. This design is part of the AdInCCSol (Advanced Integration of Combined Cycles in Solar thermal power plants) project, which aims to integrate advanced thermodynamic cycles in solar thermal power plants to improve efficiencies and lower LCOE. Specifically, the manuscript presents the optimization of a 100 MW CTR plant based on a conventional cylindrical receiver that operates at an outlet temperature of 565 ºC. Unlike previous studies, the proposed methodology considers yearly calculations and takes into account most of the parameters that affect thermal and optical efficiencies, including tube diameter, receiver diameter, height, and the number of faces. The aiming strategy for each design was also optimized to achieve the best balance between optical and thermal losses while meeting stress and corrosion limits. The study was conducted using two in-house codes that integrate thermal and optic performance calculations and models for estimating design constraints, providing accurate results with low running times. The findings of the study indicate the presence of an optimal receiver area that optimizes the design for a target power of concentrated radiation flux density. Moreover, certain combinations of parameters yield similar yearly energy productions, enabling the development of designs with comparable performance and reduced costs.

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The thermal stability of binary alkali metal nitrates

Cited by 21 publications

References 16 publications

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO₃ binary system

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO₃ binary system

Flow patterns of external solar receivers

Field and Central Receiver Design Methodology based on Multi-Parameter Optimization by the Design of Experiments (DOE) Technique

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The thermal stability of binary alkali metal nitrates

Cited by 21 publications

References 16 publications

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO3 binary system

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO3 binary system

Flow patterns of external solar receivers

Field and Central Receiver Design Methodology based on Multi-Parameter Optimization by the Design of Experiments (DOE) Technique

Contact Info

Product

Resources

About

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO₃ binary system

A novel method to extract vanadium and chromium from vanadium slag using molten NaOH‐NaNO₃ binary system