Co-combustion behavior and catalytic mechanism of high CaO/SiO2 biomass mixed with anthracite for blast furnace injection: Experiment, modeling and DFT investigation

作者：Han Dang, Runsheng Xu, Jianliang Zhang, Mingyong Wang, Guoli Jia, Lingxiao Xu · 发表于：Chemical Engineering Journal · 年份：2024 · DOI：10.1016/j.cej.2024.151239 · 被引用次数：17 · 研究领域：Thermochemical Biomass Conversion Processes、Coal and Its By-products、Coal Properties and Utilization

The physical and chemical properties of apricot tree (AT), corncob (CC), and anthracite (CC) were systematically analyzed. Their combustion behaviors and blends were examined using a non-isothermal thermogravimetric method, which revealed the catalytic mechanism of biomass mineral composition in the combustion process. The presence of high CaO content resulted in better combustibility , particularly with an addition ratio of more than 50 % AT, which enhanced anthracite combustion. Kinetic analysis indicated that the random pore model had a better fit than the volume reaction model. At 75 % addition of AT and CC, the lowest apparent activation energies were observed, with values of 100.5 kJ/mol and 110.23 kJ/mol, respectively. Density functional theory calculations demonstrated that the presence of CaO caused reconfiguration in the coal's molecular structure, making it easier for aliphatic chains attached to six-membered rings to detach. The co-combustion process and catalytic combustion mechanism of biomass and coal were discussed, highlighting CaO's ability to remove oxygen-containing functional groups and aliphatic chains, while facilitating O 2 diffusion within the molecular structure. Conversely, SiO 2 tended to generate silicates, leading to the deactivation of CaO's catalytic effect.