Effects of Water-Soluble Sodium Compounds on the Microstructure and Combustion Performance of Shengli Lignite

作者：Yanjun Wang, Yunfei Zhao, Runxia He, Zhenghao Yan, Xuemei Li, Huacong Zhou, Na Li, Keduan Zhi, Yinmin Song, Yingyue Teng, Quansheng Liu · 发表于：ACS Omega · 年份：2021 · DOI：10.1021/acsomega.1c03695 · 被引用次数：11 · 研究领域：Coal Properties and Utilization、Thermochemical Biomass Conversion Processes、Coal and Its By-products

High Resolution Image Download MS PowerPoint Slide Different water-soluble sodium compounds (NaCl, Na 2 CO 3, and NaOH) were used to treat Shengli lignite, and the resulting effects on the microstructure and combustion performance of the coal were investigated. The results showed that Na 2 CO 3 and NaOH had a significant impact on combustion performance of lignite, while NaCl did not. The Na 2 CO 3 -treated lignite showed two distinct weight-loss temperature regions, and after NaOH treatment, the main combustion peak of the sample moved to the high temperature. This indicates that both Na 2 CO 3 and NaOH can inhibit the combustion of lignite, with the latter showing a greater effect. The FT-IR/XPS results revealed that Na + interacted with the oxygen-containing functional groups in lignite to form a “–COONa” structure during the Na 2 CO 3 and NaOH treatments. It is deduced that the inhibitory effect on combustion of lignite may be attributed to the stability of the “–COONa” structure, and the relative amount is directly correlated with the inhibitory effect. The XRD/Raman analysis indicated that the stability of the aromatic structure containing “–COOH” increased with the number of “–COONa” structures formed. Additionally, experiments with carboxyl-containing compounds further demonstrated that the number of oxygen-containing functional groups combined with Na was the main reason for the differences in the combustion performance of treated lignite.