Material investigations on the thermal stability of solar salt and potential filler materials for molten salt storage

Hot corrosion behavior of commercial alloys in thermal energy storage material of molten MgCl2/KCl/NaCl under inert atmosphere

“…It can be produced by hydrolysis of water adsorbed in the chloride salts during the heating (see reaction (1)). We assume that no reaction occurs in the molten MgCl 2 /KCl/NaCl and no HCl gas above the salt is swept out, which means that the molten MgCl 2 /KCl/NaCl keep an equilibrium, shown in reaction (7). Therefore, the concentrations of the MgOH + , Mg 2+ , O 2and H + ions are constant.…”

“…In order to improve the power tower system performance, work on improving the stability of Solar Salt at high temperature has been done in our research group [7].…”

Investigation of the long-term stability of quartzite and basalt for a potential use as filler materials for a molten-salt based thermocline storage concept

“…As titrant Merck Titrisol ® 0,01mol/L or 0,1mol/L, dependent on the expected oxide level in the sample, was diluted in 1L of deionized Water and a control titration was measured with analytical grade sodium carbonate. The used analysis method for measuring the salt composition is described more detailed by Bonk et al (2017). Published in; Solar Energy 171 (1) 2018, 827-840…”

“…However, related to filler materials in interaction with Solar Salt, not only atmospheric CO 2 may be a source of carbonate formation. Bonk et al have demonstrated that carbonates in fillers (CaCO 3 -phases or similar) can be leaked out of the filler compartments resulting in carbonate formation in the melt (Bonk et al, 2017). Figure 17 shows the nitrite, nitrate, carbonate and oxide contents in Solar Salt stored with the different filler materials over time.…”

“…a) melting enthalpies, and (b) melting onsets of Solar Salt stored with different filler particles as indicated. Data was reprinted from ref(Bonk et al, 2017) …”