The structural characteristics and gasification performance of cokes of modified coal extracted from the mixture of low-rank coal and biomass

This study aimed to effectively utilize low-rank coal and biomass residue in the coking process . The gasification performance of cokes prepared from the modified coal was investigated, meanwhile the structural characteristics of different cokes were analyzed by Raman spectroscopy, X-ray diffraction and infrared spectroscopy. The results showed that solvent thermal extraction process could dramatically remove the ash content and gradually enhance the caking performance and carbon content for low-rank coal. The ash content, carbon content, penetration distance, and caking index of modified coal were 0.86 wt%, 78.18 wt%, 35.48 mm, and 95%, respectively. Structural analysis results showed that the order degree and graphitization degree of BIOC-HPC coke were superior to those of coking coal coke, and the overall compactness of BIOC-HPC coke was improved. Compared with the coking coal coke, the gasification performance of coke could be improved by adding modified coal; the optimal addition ratio of the modified coal in coal blending for coking was between 10 wt% to 15 wt%. The gasification kinetic analysis indicated that the RPM model was the optimal model for simulating the gasification process of modified coal coke, and the activation energy was between 211.36 kJ/mol and 228.81 kJ/mol.