Effect of the impurity magnesium nitrate in the thermal decomposition of the solar salt

Prieto, Cristina; Ruiz-Cabañas, F. Javier; Rodriguez-Sanchez, Alfonso; Abujas, Carlos R.; Fernández, A. Inés; Martínez, Mónica García; Oró, Eduard; Cabeza, Luisa F.

doi:10.1016/j.solener.2018.08.046

Cited by 30 publications

(14 citation statements)

References 14 publications

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“…Hence, there is a genuine chance that the optical band gap may be affected. For instance, the studies on magnesium nitrate impurity in the contribution of NOx emissions during the thermal decomposition of the solar salt for thermal energy storage; has been reported [10]. As mentioned earlier, one of the most potential material for thermochemical heat storage is Ca(OH)2/CaO [1,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Harish¹,

Kumar²,

Kumari³

et al. 2021

J. Nano- Electron. Phys.

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Here we report synthesis and characterization of chemically synthesized calcium hydroxide (Ca(OH)2) with and without deliberate presence of NaNO3 as an impurity. Calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) is used as precursor and alkaline NaOH solution is used as precipitant to synthesize the Ca(OH)2 samples. The samples were characterized by XRD, FESEM, FTIR spectroscopy, DTA, TGA and UV-Vis spectroscopy techniques. From the UV-Vis spectroscopy results, it is found that the Ca(OH)2 with NaNO3 impurity has higher bandgap than the sample without NaNO3. The weight loss in TGA is also more for the Ca(OH)2 with impurity than the one for without impurity. The results are discussed in terms of composition formed during synthesis process.

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Section: Introductionmentioning

confidence: 99%

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Harish¹,

Kumar²,

Kumari³

et al. 2021

J. Nano- Electron. Phys.

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“…This brings a new view to the selection of the type of salts to use in a CSP plant. Previous studies focused on showing that even though the use of salts from mines can produce more NOx emissions in the plant start-up, mainly due to the contained impurities, this can be overcome with a correct plant start-up process [22]. This paper shows that the nitrate salts life-cycle should also been considered.…”

Section: Discussionmentioning

confidence: 97%

Life Cycle Assessment (LCA) of a Concentrating Solar Power (CSP) Plant in Tower Configuration with and without Thermal Energy Storage (TES)

et al. 2021

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Despite the big deployment of concentrating solar power (CSP) plants, their environmental evaluation is still a pending issue. In this paper, a detailed life cycle assessment (LCA) of a CSP tower plant with molten salts storage in a baseload configuration is carried out and compared with a reference CSP plant without storage. Results show that the plant with storage has a lower environmental impact due to the lower operational impact. The dependence on grid electricity in a CSP tower plant without storage increases its operation stage impact. The impact of the manufacturing and disposal stage is similar in both plants. When analyzed in detail, the solar field system and the thermal energy storage (TES) and heat transfer fluid (HTF) systems are the ones with higher impact. Within the storage system, the molten salts are those with higher impact. Therefore, in this study the impact of the origin of the salts is evaluated, showing that when the salts come from mines their impact is lower than when they are synthetized. Results show that storage is a key element for CSP plants not only to ensure dispatchability but also to reduce their environmental impact.

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“…In the case of A516 (Figure 2), the image at 200 h (left) shows a uniform corrosion layer with a small area (spectrum 1) without corrosion, detecting the base material in the EDS analysis. The corrosion layer is mainly composed by Fe-O with magnesium content as an active impurity from the salt [16]. Cross sectional study was analyzed at the end of the test (1000 h) and it is shown in Figure 3.…”

Section: Methodsmentioning

confidence: 99%

Dynamic Corrosion Test Using LiNO3 Containing Molten Salt for CSP Applications

et al. 2020

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Low melting point thermal energy storage (TES) materials have been proposed in the last years to reduce the storage cost in concentrating solar power (CSP) technology. One of the most interesting additive due to the enhancement in thermal properties is lithium nitrate. However, there is a lack of dynamic corrosion tests to simulate real operation conditions in CSP plants. In this work, we present a dynamic reactor set up where a mixture of 30 wt.% LiNO3 + 57 wt.% KNO3 + 13 wt.%. NaNO3 is moved through a mechanical stirrer obtaining a lineal speed of 0.30 m/s. A commercial carbon steel A516 was tested as container material at 390 °C during 1000 h. Fe2O3 and Fe3O4 were obtained as the main corrosion products by scanning electron microscopy (SEM) and x-ray diffraction (XRD) with a metallographic corrosion rate of 0.015 mm/year.

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Effect of the impurity magnesium nitrate in the thermal decomposition of the solar salt

Cited by 30 publications

References 14 publications

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Influence of Impurity on the Properties of Chemically Synthesized Calcium Hydroxide

Life Cycle Assessment (LCA) of a Concentrating Solar Power (CSP) Plant in Tower Configuration with and without Thermal Energy Storage (TES)

Dynamic Corrosion Test Using LiNO3 Containing Molten Salt for CSP Applications

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