富钾生物质渣侵蚀无铬耐火材料机理研究OA

Biomass gasification is an environmentally friendly,efficient and sustainable tech-nology for utilizing biomass energy.However,the biomass slag generated during the gasification pro-cess severely erodes the refractory lining in gasifiers,and its underlying mechanisms require urgent investigation.Sessile-drop experiments were conducted under gasification conditions to examine the wetting,spreading and penetration behaviors of potassium-rich biomass slag on refractories composed of SiC-MgAl2O4 and SiC-Si3N4.The sample sections were analyzed for erosion behavior and chemi-cal composition using scanning electron microscopy-energy dispersive spectrometer(SEM-EDS).Additionally,the interaction between the refractories and potassium-rich biomass slag was simulated using FactSage software.The combined results of experimental and thermochemical simulation results reveal the mechanisms underlying the penetration and erosion processes of potassium-rich bio-mass slag on refractories.The findings indicate that SiC-Si3N4 refractory exhibits better slag resis-tance than SiC-MgAl2O4,with the final wetting angles of slag on these two refractories being 37.5° and 4°,respectively.SEM-EDS analysis reveals that potassium(K)demonstrates a stronger penetra-tion ability in MgAl2O4,leading to the oxidation of SiC in SiC-MgAl2O4 and the dissolution of small amounts of MgAl2O4 by the potassium-rich slag.In contrast,the Si3N4 matrix in SiC-Si3N4 under-goes more significant oxidation,and the generated cristobalite is dissolved into the slag,increasing its viscosity and reducing the penetration ability of the slag.