COMBUSTION CHARACTERISTICS AND KINETIC ANALYSIS OF BIOMASS CHAR-ANTHRACITE COAL BLENDS

Experimental research on non-isothermal combustion characteristics and dynamic parameters of biomass char-anthracite coal blends were conducted by thermo-gravimetric balance. The combustion characteristics parameters-such as ignition temperature, the temperature at maximum weight loss rate, burning out temperature, and maximum rate of combustion were studied by thermo-gravimetric analysis and the kinetics parameters of samples in different ratio of biomass char such as activation energy and the frequency factor were also investigated. The experimental results show that both the activation energy and the frequency factor decreased with increasing of biomass char ratio in the blends. The activation energy of the first stage and second stage exhibit "U-shaped" and "ladder-shaped" curve changing trends against biomass ratio, respectively. Analyzing from activation energy changed trend in the first and second stages, the improved flammability of blends both reflects in the first stage of the pyrogenation process (Volatile devolatilization) and the second stage of combustion (Combustion of fixed carbon). Activation energy calculating results show that biomass char can improve the ignition property of coal and have catalytic and promotive effect on combustion of coal.