Study on the characteristic temperatures of coking based on the Gieseler fluidity of coking coal

ZHANG Wencheng; WANG Guohui; PENG Shuo

doi:10.3969/j.issn.1007-7677.2026.01.06

Abstract：Seventy coal samples were selected as the research subjects,and Gieseler fluidity tests were conducted to analyze the characteristic coking temperatures of coking coal in depth.The study focuses on examining how character-istic coking temperatures affect the caking properties,degree of coalification,and coking performance of coking coal,while also analyzing the structural characteristics of coking coal to gain deeper insights into the coke-forming mecha-nism.The results revealed correlations among characteristic coking temperatures,which reflect the generation,ex-pansion,and solidification processes of the plastic layer during coking.The temperature interval ΔTg showed signifi-cant correlations with the maximum thickness of plastic layer Y and Gieseler fluidity index lgMF.The maximum fluidi-ty temperature Tm and solidification temperature Ts exhibited notable correlations with volatile Vdaf and maximum vit-rinite reflectance Rmax.Additionally,the solidification temperature Ts demonstrated strong correlations with the me-chanical strength of coke,coke reactivity,and post-reaction strength.The coking characteristic temperatures reflect the structural properties of coking coal,which is of great significance for coal blending and coking.