Thermo Fluid Dynamic characterization of ternary and quaternary mixtures of MS employed in High temperature storage systems

Short description

Test method, test facilities, data base for the thermal characterization

Main technical features

Nitrate (nitrate mixtures rendered alkali and alkaline earth) can be used successfully as interim heat transport medium between a biomass boiler and a fluid for an organic Rankine cycle.

The characteristics of the blends more used are summarised, together with an experimental study comparing the two fluids physical chemical characteristics: One

Binary mixture: 40 % by weight (NaNO3/KNO360) called “solar salt’ as its use in concentrated solar installations and a ternary containing calcium nitrate (Ca (NO 3) 2/NaNO3/KNO342, 2: 15,3: 42.5 % by weight).

The basic principle of this technique is to obtain information on the test material cycles and is subjected to heating and/or cooling controlled.

Innovative aspects

The reometro used for measurements is rotational 933/2008 parallel dishes

The method involves measurement of the effort at a certain speed of rotation.

Applications

Test system to verify and compare the stability of mixtures of salts.

The sample (50 grams) was placed in a flask of quartz, which in turn is positioned inside a heating mantle. The temperature is measured with a thermocouple ternary immersed in the fluid. Three different temperatures: 420, 450 and 475 °C (the maximum temperature reached by the system), salt was kept at approximately 2 hours on each isotherm, therefore was taken.

A rate of ternary on this were measured the percentages of oxides and nitrites.

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