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Comparing the thermal conversion behavior of bio-wastes in three molten nitrates

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  • Yang, Yuhan
  • Wang, Tiancheng
  • Zou, Chan
  • Xu, Kai
  • Hu, Hongyun
  • Gao, Linxia
  • Li, Xian
  • Yao, Hong

Abstract

Molten salt could act as both heat transfer fluid and catalyst in bio-waste pyrolysis. The temperature and composition of anions and cations of molten salts have significantly different effect on the pyrolysis behavior of bio-waste. In this study, three kinds of molten nitrates have been applied to conduct thermal conversion experiments of two kinds of bio-waste (beech and waste paper). The results showed that NO2− has a higher reactivity towards the bio-waste than NO3−. In detail, a faster reaction rate of biowaste pyrolysis and higher yield of gas products were found in NaNO3–KNO3–NaNO2 and NaNO3–NaNO2 than NaNO3–KNO3. From the GC-MS analysis, it can be concluded that K+ inhibited the dehydroxylation process of phenols at 300 °C, while the phenols were completely converted to the aromatic hydrocarbonas the temperature went up. In addition, nitrogenous heterocycle was produced due to the reaction between furans, aldehydes, ketones and NO2−/NO3−, and the nitration process was found to be enhanced as the temperature rose. Inorganic components contained in bio-waste remaining in molten salt may affect its catalytic properties. Therefore, the effect of KCl–K2SO4–CaCO3 on the pyrolysis behavior of bio-waste in molten nitrate was also investigated. The inorganic components increased the weight loss temperature, while the thermal conversion of bio-wastes was promoted after reaching the reaction temperature. The study in this paper provides guidance for the selection of appropriate molten nitrate system and temperature for bio-waste treatment.

Suggested Citation

  • Yang, Yuhan & Wang, Tiancheng & Zou, Chan & Xu, Kai & Hu, Hongyun & Gao, Linxia & Li, Xian & Yao, Hong, 2022. "Comparing the thermal conversion behavior of bio-wastes in three molten nitrates," Renewable Energy, Elsevier, vol. 196(C), pages 617-624.
    • Handle: RePEc:eee:renene:v:196:y:2022:i:c:p:617-624
    DOI: 10.1016/j.renene.2022.06.123
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    References listed on IDEAS

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    1. Yang, Fu & Hu, Hongyun & Gao, Qiang & Yang, Yuhan & Tang, Hua & Xie, Kang & Liu, Huan & He, Yao & Yao, Hong, 2020. "Study on the influence of small molecular gases on toluene reforming in molten salt," Renewable Energy, Elsevier, vol. 153(C), pages 832-839.
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    4. Yang, Yuhan & Wang, Tiancheng & Hu, Hongyun & Yao, Dingding & Zou, Chan & Xu, Kai & Li, Xian & Yao, Hong, 2021. "Influence of partial components removal on pyrolysis behavior of lignocellulosic biowaste in molten salts," Renewable Energy, Elsevier, vol. 180(C), pages 616-625.
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