Insights into the co-combustion attributes and mutual effects of high-alkali lignite and flotation carbon-rich fractions from coal gasification fine slag

作者：Yang Guo, Demian Wang, Xinjie Liu, Jianjun Wu, Fanhui Guo, Yixin Zhang, Shiling Yuan, Chunan Du, Meng Lin, Junliang Liu · 发表于：Results in Engineering · 年份：2025 · DOI：10.1016/j.rineng.2025.105310 · 被引用次数：11 · 研究领域：Coal and Its By-products、Thermochemical Biomass Conversion Processes、Coal Combustion and Slurry Processing

The reutilization of waste coal gasification fine slag (GFS) as an energy source through co-combustion technology has been demonstrated to be a more economically and environmentally viable solution. The reutilization of waste coal gasification fine slag (GFS) via co-combustion with high-alkali lignite (LC) offers economic and environmental benefits. This study investigates enhancing the thermal reactivity of flotation carbon-rich fractions (FC) from GFS through co-combustion with LC while mitigating LC-induced slagging. Combustion performance, interactions, kinetics, and slagging tendencies were analyzed using thermogravimetric analysis (TG), kinetic modeling, and principal component analysis (PCA). Results demonstrated that co-combustion significantly improved reaction efficiency and performance. Synergistic interactions dominated the co-combustion process at 40-60% FC blending ratio, though antagonistic effects occurred during the initial ignition and final burnout stages. The interaction mechanism stemmed from the porous microstructure of FC, enhanced heat transfer, and catalytic effects from alkali metals (Na/K) of LC. PCA highlighted a stronger systemic influence of LC due to its high reactivity and alkali metals content, which reduced the reaction activation energy and accelerated combustion kinetics. In addition, the base-to-acid ratio regression model confirms a negative correlation between FC proportion and slagging risk. Furthermore, the optimal blending ratio of FC...