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

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

Renewable Energy, 2022, vol. 196, issue C, 617-624

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.

Keywords: Bio-wastes; Clean utilization; Molten nitrate; Thermal conversion behavior; Nitrification (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:196:y:2022:i:c:p:617-624

DOI: 10.1016/j.renene.2022.06.123

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