Combustion characteristics and thermokinetics of coconut shell, coal water slurry, and biomass

The combustion characteristics of coconut shell, coal water slurry, and biomass were studied by combustion thermogravimetry at different heating rates. The DTG curves of all samples exhibit three distinct peaks. The comprehensive combustion characteristic index (S_N) of coconut shell and biomass was higher, and the ignition point and burnout temperature were lower. At the same heating rate, the S_N of coal water slurry is the highest, the S_N of coconut shell, coal water slurry and biomass increased by 337%, 259%, and 429%. Based on the distributed Coats–Redfern integral method, the combustion kinetics of the samples was analyzed. The activation energy of low temperature combustion zone is higher than that in high temperature combustion zone. As the heating rate increases, the activation energy of the samples decreases slightly, but the overall trend remains similar. When n = 2, the fitting curve has a good linear relationship, and the correlation coefficient R² is all above 0.99.