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NOx emissions and NO2- formation in thermal energy storage process of binary molten nitrate salts

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  • Wei, Xiaolan
  • Wang, Yan
  • Peng, Qiang
  • Yang, Jianping
  • Yang, Xiaoxi
  • Ding, Jing

Abstract

Referring to the national environmental protection standard of PR China, HJ479-2009, NOx emissions and the effect of 45# carbon steel (1045, ASTM) on it in thermal energy storage (TES) process of binary molten nitrate (BMN) salts (a eutectic salt mixture named as solar salt with the component of 60% NaNO3 and 40% KNO3) are discussed in this paper. The accumulative absorption concentrations of NOx emissions in tail gases of molten salts heated at different temperatures were measured to study the thermal decomposition situation of molten salts in TES process. Furthermore, the concentrations of nitrite ion in molten salts samples were determined and chemical thermodynamic calculations of related reactions were done to explain the results. The research shows that BMN salts contained in silica or carbon steel container in the air under certain conditions can release NOx in its use of temperature range. The concentrations of NOx emissions and nitrite ion in molten salts both increase with the rise of the temperature. After contacting with 45# carbon steel, the total concentrations of NOx emissions and nitrite ion in molten salts increased, which may be caused by Fe component in the carbon steel.

Suggested Citation

  • Wei, Xiaolan & Wang, Yan & Peng, Qiang & Yang, Jianping & Yang, Xiaoxi & Ding, Jing, 2014. "NOx emissions and NO2- formation in thermal energy storage process of binary molten nitrate salts," Energy, Elsevier, vol. 74(C), pages 215-221.
    • Handle: RePEc:eee:energy:v:74:y:2014:i:c:p:215-221
    DOI: 10.1016/j.energy.2014.05.064
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    References listed on IDEAS

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    1. Pihl, Erik & Kushnir, Duncan & Sandén, Björn & Johnsson, Filip, 2012. "Material constraints for concentrating solar thermal power," Energy, Elsevier, vol. 44(1), pages 944-954.
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    1. Wei, Xiaolan & Yang, Chuntao & Lu, Jianfeng & Wang, Weilong & Ding, Jing, 2017. "The mechanism of NOx emissions from binary molten nitrate salts contacting nickel base alloy in thermal energy storage process," Applied Energy, Elsevier, vol. 207(C), pages 265-273.
    2. Wei, Xiaolan & Qin, Bo & Yang, Chuntao & Wang, Weilong & Ding, Jing & Wang, Yan & Peng, Qiang, 2019. "Nox emission of ternary nitrate molten salts in high-temperature heat storage and transfer process," Applied Energy, Elsevier, vol. 236(C), pages 147-154.
    3. Julian Steinbrecher & Markus Braun & Thomas Bauer & Sebastian Kunkel & Alexander Bonk, 2023. "Solar Salt above 600 °C: Impact of Experimental Design on Thermodynamic Stability Results," Energies, MDPI, vol. 16(14), pages 1-16, July.
    4. Villada, Carolina & Bonk, Alexander & Bauer, Thomas & Bolívar, Francisco, 2018. "High-temperature stability of nitrate/nitrite molten salt mixtures under different atmospheres," Applied Energy, Elsevier, vol. 226(C), pages 107-115.

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