【摘 要】
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Nitrate based mixing salts were applied as heat transfer fluid and thermal energy storagemedia in commercial concentrated solar power(CSP)plants.Generally,the operating temperature of these salts is b
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Nitrate based mixing salts were applied as heat transfer fluid and thermal energy storagemedia in commercial concentrated solar power(CSP)plants.Generally,the operating temperature of these salts is between 200℃ to 550℃.There is a ternary nitrate combine with potassium nitrate,sodium nitrate and lithium nitrate.Different mass fraction(4％-20％)of sodium nitrite was added into this mixed nitrate.The peak position of lithium nitrate is similar to that of sodium nitrate and potassium nitrateby Raman spectrometer.And some of the peaks of the ternary nitrate cant be accurately resolved.Raman spectra of mixed nitrate with different concentrations of sodium nitrite were observed.It is found that only when the content of sodium nitrite is high(20wt％),the characteristic peaks of the sodium nitrite can be observed in the Raman spectra.And not only the ionic bond between cation and nitrate,but also the structure of nitrate was found changed.When the content of sodium nitrite is high(20 wt％),the characteristic peaks of the sodium nitrite can be observed in the Raman spectra.The ionic bond between potassium ion and nitrate and the structure of nitrate in potassium nitrate turn out a blue shift.While the ionic bond between sodium ion and nitrate and the structure of nitrate in sodium nitrate turn out a red shift.The start melting temperature and the thermal stability of this mixed nitrate changed with the content of sodium nitrite through a simultaneous thermal analyzer.The start melting temperature decreased with the increase of sodium nitrite(from 110oC to 104oC).And the quality loss under high temperature increased with the increase of sodium nitrite (from 1.87％to3.53％),which means the thermal stability decreased.
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