Interaction of vitrinites in 1/3 coking coals with similar rank during coking process

LUO Yunhong; LIU Chaolei; LI Jinze; SUN Zhang

doi:10.3969/j.issn.1007-7677.2025.03.002

Abstract：The study on the interaction of vitrinites wth similar coal ranks during the pyrolysis process is beneficial for a better understanding of the coking mechanism of coals,which could provide experimental and theoretical basis for improving coal blending theory and carbonization mechanism.The vitrinites in Tangshan(TS)and Hegang(HG)1/3 coking coals with similar ranks were enriched,and then mixed in different proportions to coking.The gasification reac-tivity,microcrystalline structure and surface morphology of the coke were investigated by TG,XRD and SEM.The results show that the maximum gasification rate(DTGmax)of the coke decreases first and then increases with the increase of TS vitrinite content,and the TS an HG vitrinites have interaction with each other during coking process.Based on the differ-ence in the gasification rate,an interaction factor(α)is proposed to characterize the degree of interaction(α=4.93%).The results of XRD and SEM analysis show that the graphitization degree of coke derived from TS∶HG=1∶1 coal blending is higher,and the surface morphology of coke is relatively smooth and the lattice defects are less.Therefore,the interac-tion between the two vitrinites during pyrolysis processes could promote the growth of microcrystals of coke,and the mi-crocrystalline structure of coke is more orderly,which could lead to the stronger ability to resist CO2 erosion for cokes.