Abstract
To address the challenges posed by the challenging ignition, low volatile content, and high ash content of coal gangue (CG) during separate combustions, a proposed treatment involves mixing CG with polypropylene (PP), offering the potential for centralized treatment. Co-combustion experiments were carried out at varying ratios, and a corresponding model for co-combustion was established. The thermal impact of temperature variations during co-combustion is analyzed, and the kinetic characteristics of the co-combustion process are explored. The findings indicate that the volatile matter released by PP notably decreases the activation energy of the mixed fuel in the initial combustion stage. Co-combustion at different ratios enhances overall combustion, particularly when the PP content is 20 %. At this specific ratio, the temperature-averaged thermal relative coupling coefficients are 1.64 and 2.30 times greater than those at PP contents of 50 % and 80 %, respectively. These results hold significance for the comprehensive utilization of CG.
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