Combustion Characteristics and Kinetics of Blast Furnace Dust and Coal Blends
煤粉添加高炉除尘灰混合燃烧特性及动力学研究

Combustion characteristics and kinetic parameters of blast furnace dust and coal blends using non-isothermal combustion method were studied by thermo-gravimetric balance. The combustion characteristic parameters of samples in different ratios, such as ignition temperature, peak temperature at the maximum weight loss rate, burnout temperature and the maximum combustion rate, were studied by thermo-gravimetric analysis, and the kinetic parameters such as activation energy Ea and frequency factor A were also investigated. The experimental results showed that Ea and A both decreased with increasing of blast furnace dust content in the blend, and the "kinetic compensation effect" existed in the two parameters. Ea decreased in the first and second stages of combustion of blast furnace dust and coal blends, but the influential degree changed largely for different coals. The calculation results of Ea showed that the blast furnace dust could improve the ignition property of coal, moreover there existed a synergistic effect in the combustion of blast furnace dust and coal blends, with the best property of 5% blending.