Combustion performance and reaction activity of coal char

China is abundant in lignite,while its application is greatly limited by its characteristics.With the help of thermal gravimetric analyzer,study the reaction activity of chars.Analyse the combustion characteristics of blended fuel combining char whose pyrolysis final temperature is 1273 K and raw coal with different proportion.Analyse the combustion kinetics with Coats-Redfern method.The combustion reactivity of char can be charactered by the apparent activation energy.The results show that,the char reaction activity decreass with the increase of final temperature of pyrolysis,the added lignite help increase the combustion characteristics of char,while compared with the raw coal,the combustion stability of blended fuel change little.Continue to increase the ratio of lignite,the activation energy of blended fuel gradually increase,it become harder to light.The added lignite influence the combustion characteristics and reactivity of blended fuel.Under the same preparation condition,the combustion kinetic index of bituminous coal char and lignite char vary widely.That indicate that,the combustion reaction activity is related to the coal type.