Combustion characteristics and kinetics of mixed coke dry quenching dust and low ash coal

Combustion kinetics of mixed coke dry quenching (CDQ) dust and low ash coal was investigated by thermogravimetric analysis from ambient temperature to 1173 K at 60 mL/min air flow rate under different heating rates, respectively. The results showed that CDQ dust content and heating rate had important effects on the combustion process of dust-coal blends. With the increase of CDQ dust content in the coal blends, the ignition temperature and burnout temperature decreased, the maximum loss rate and the combustible index increased, and the burning characteristic of the blends became better. The non-isothermal Flynn-Wall-Ozawa model was used to study the combustion kinetics of blends under different heating rates. When CDQ dust content varied from 0 to 10%, the activation energy decreased from 96.82 to 47.37 kJ/mol. Furthermore, adding 8% CDQ dust into the blends could decrease the activate energy of the blends effectively.