Lithium nitrate purity influence assessment in ternary molten salts as thermal energy storage material for CSP plants

A Materials Screening Test of Corrosion Monitoring in LiNO3 Containing Molten Salts as a Thermal Energy Storage Material for CSP Plants

“…Meanwhile, increase of O −2 ions in the boundary layer create metal oxide anions soluble in the salt generating oxide ion O −2 in contact with the metal surface, thus, these processes could be identified by a change in electrochemical impedance as a function of time. The species generated by the reaction with O −2 ions due to the dissociation NO − 3 ions in the bulk electrolyte are showed in the Equations ( 4), (9), and (11) respectively.…”

“…Sci. 2020, 10, x FOR PEER REVIEW 6 of 21 The species generated by the reaction with ions due to the dissociation ions in the bulk electrolyte are showed in the Equations ( 4), (9), and (11) respectively. 3 ↔ 2 (7) Some additional reactions related with nickel ions were identified: Some additional reactions related with nickel ions were identified: Some additional reactions related with nickel ions were identified: According to the reaction mechanism of nickel in Figure 5, NiO can be dissociated in acid/basic medium through the activity of the oxide ion , resulting in potentially soluble nickel oxide ions.…”

“…M. Henriquez et al [9] have proposed an eutectic ternary nitrate salt with a composition of 30 wt.% LiNO 3 -13 wt.% NaNO 3 -57 wt.% KNO 3 , commonly referred to as (LiNaK)NO 3 , as a candidate nitrate salt. The use of (LiNaK)NO 3 enables an increase in the operating temperature of commercial CSP to 550 • C [10].…”

Dynamic Corrosion Test Using LiNO3 Containing Molten Salt for CSP Applications

“…The cost reduction in CSP technology has been one of the main objectives, especially in the storage block. In this direction, different additives have been proposed in order to improve the thermal properties in the solar salt (60 wt.% NaNO 3 + 40 wt.% KNO 3 ), as NaNO 2 , Ca(NO 3 ) 2 and LiNO 3 [2][3][4][5][6]. Table 1 shows the main thermal properties obtained with these additions compared to solar salt.…”

“…As shown in Table 1, the addition of LiNO 3 could reduce the melting points of these molten salt mixtures to 130 • C obtaining a work temperature range around 465 • C [6]. This reduction in the melting point temperature can improve the parasitic consumption due to freezing protection systems, also in addition to the effect of increasing the current field temperature limitation and the impact on plant capacity factor, therefore, an interesting cost reduction could be obtained in the CSP plant economic balance related with the storage block.…”