Prompt Description

With the increasing demand for energy and growing emphasis on environmental protection, research on biomass and coal co-pyrolysis has gradually become a focal point in the energy sector. Lignin, as a crucial component of biomass, and its co-pyrolysis characteristics with Shenmu coal have garnered widespread attention. This study investigates lignin in different sodium forms to explore the differences in pyrolysis behavior, product distribution, and pyrolysis mechanisms during the co-pyrolysis of lignin and Shenmu coal. The objective is to provide a theoretical basis and technical support for the efficient and clean conversion and utilization of biomass and coal, thereby further promoting the sustainable development of the energy sector. The results indicate that different lignins can promote the release of volatile components during coal co-pyrolysis, but the extent of the impact varies due to their different properties. Organically bound lignin sodium (PL(COxNa)) alters the pyrolysis reaction pathways and product selectivity through catalytic action, which is conducive to gas production and reduces tar yield; the pyrolysis gas yield significantly increases to 20.67 wt%, and the tar yield decreases to 6.04 wt%; compared with pyrolysis with other lignins alone, its H₂ and CO₂ yields are higher, reaching approximately 9.0 wt% and 7.0 wt%, respectively. The addition of inorganic sodium-bound lignin (PL2.7NaOH0.3) mainly affects the pyrolysis reaction by creating an alkaline environment, resulting in a decrease in tar yield to 8.14 wt% and an increase in pyrolysis gas yield to 16.72 wt%, with relatively small changes in magnitude. BET analysis of the co-pyrolysis char shows that the structural parameters of PL(COxNa), PL2.7NaOH0.3, and SM co-pyrolysis char are optimized, with pore sizes increasing to 7.68 nm and 7.19 nm, respectively, and the pore structure is irregular, providing favorable conditions for subsequent gasification. Generate a graphical abstract.