Mechanism and kinetic characteristics of pulverized coal combustion in two phase flow

The combustion reaction mechanism and kinetic characteristics of pulverized anthracite coal in two phase flow were studied by micro fluidized bed kinetic analyzer, and compared with those by thermogravimetry method. The results show that the combustion reaction mechanism of pulverized coal and the composition of combustion gas product change when the temperature exceeds 850℃. When the flow rate exceeds 0.10 m/s, the effect of gas diffusion is eliminated basically, and the combustion reaction rate of pulverized coal is mainly controlled by the interface reaction. The combustion reaction rate of pulverized coal increases in a power function form with oxygen partial pressure, and the influence of oxygen partial pressure on the static combustion is more remarkable. The apparent activation energy of pulverized coal combustion in two phase flow decreases by 49 kJ/mol compared with that of static combustion, and the interfacial chemical reaction resistance of pulverized coal combustion in two phase flow is also much smaller than the results by thermogravimetry method at the same temperature.