TITLE:
Experimental Research on the Co-Combustion Characteristics of High-Calorific Bituminous Coal and Anthracite
AUTHORS:
Zhu Cui, Yangyang Ma, Jiahui Zhao, Dazhuang Liu, Xin Zhang
KEYWORDS:
Coal Co-Combustion, Thermogravimetric Analysis, Non-Additive TG Deviation, Isoconversional Kinetics, XRD, SEM-EDS, Mineral Transformation, Ash Evolution
JOURNAL NAME:
Open Journal of Energy Efficiency,
Vol.15 No.3,
September
24,
2026
ABSTRACT: Understanding how coals of different ranks interact during combustion requires linking macroscopic combustion behavior with reaction kinetics, mineral transformations, and microstructural evolution. Here, high-calorific-value bituminous coal (GY), anthracite (WY), and their 1:1 blend (GYW) were examined by thermogravimetric/derivative thermogravimetric analysis (TG-DTG), a mass-weighted non-additivity assessment, model-free isoconversional kinetics (DAEM, FWO, and Starink), X-ray diffraction (XRD), and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS). GY ignited earlier than WY (Ti = 294.12˚C versus 412.95˚C), consistent with its higher volatile-matter content. GYW showed small, sign-changing departures from the mass-weighted reference. With Δw = TGexp − TGcal, positive Δw denotes greater retained mass (apparent inhibition), whereas negative Δw denotes lower retained mass (apparent promotion); at 10˚C/min, the extrema were +0.981% near 590˚C and −0.739% near 528˚C. Because each condition was retained as a duplicate (n = 2) and the observed deviations (0.22% - 1.65% across the reported conditions) were within the