Abstract
Since the oxidant in the MILD combustion is diluted by recirculated flue gas, the combustion characteristics of the pulverized coal in the MILD combustion are significantly different from the conventional combustion. In this work, thermogravimetric analysis is used to study the combustion characteristics and kinetic characteristics of pulverized coal under low oxygen concentration atmosphere. The results show that pulverized coal has a higher burnout temperature under low oxygen concentrations. Increasing the heating rate or replacing N2 with CO2 improves the combustibility of pulverized coal. In the O2/CO2 atmosphere, due to the low oxygen concentration and the high burnout temperature, the high heating rate may make the contribution of coal gasification greater than that of oxidation. In addition, the Coats-Redfern method is used to calculate the kinetic parameters of pulverized coal MILD combustion under different conditions, and the activation energy ranges from 27.22 kJ/mol to 162.53 kJ/mol.
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