Co-combustion characteristics and kinetic analysis of char blends with bituminous coal

This study evaluates the effect of blending coal on the combustion characteristics and kinetics of char through the testing of five coal and char blends under the conditions of 873-1173K and 21% oxygen in a micro-fluidized bed analysis system. The results show that blending bituminous coal can shorten the reaction time of char, improve reactivity and reaction rate, and reduce apparent activation energy. The optimal proportion is 50%. When the proportion are 0%, 25%, 50%, 75% and 100%, the transition temperature of the combustion Zone I are 1073 K, 1073 K, 1073 K, 1023 K and 973 K, and the intrinsic activation energy in the combustion Zone I of the blends are 119 kJ/mol, 111 kJ/mol, 107 kJ/mol, 97 kJ/mol and 144 kJ/mol respectively.