Formulation of oxidation reaction rate for deposit carbon in a coke oven chamber by thermogravimetry

Deposit carbon on the wall disturbs a stable operation in a coke-oven battery while it plays an important role to seal up the liner bricks between a coking chamber and a combustion chamber. Therefore it is important to control the thickness of deposit carbon. Thus, it is necessary to estimate oxidation reactivity of deposit carbon. In this study, the thermogravimetry was carried out and the oxidation reaction rate was formulated for deposit carbon. In the measurement, deposit carbon samples were heated up to 1273 K at four different heating rates using thermogravimetric analyzer (TGA). It was found the deposit carbon has lower oxidation reactivity than coal char and coke and higher oxidation reactivity than graphite material. In the formulation, the activation energy and the reaction mechanism model were determined by Friedman method and by master-plot method, respectively. The evaluated equation well predicted experimental data on the oxidation reaction rate of deposit carbon.