By using the thermogravimetric analysis method

the influence of different coal sorts

different temperature-rising rates

and different ash/coal ratios upon kinetics of coal pyrolysis and gasification in CO2 atmosphere has been studied.Results show that the reaction rate decreases and the activeation energy increases along with the temperature-rising rate increases;the metal oxide in ash acts as catalyst along with the ash/coal ratio increases under condition of same temperature-rising rate

making the reaction rate to increase

and being remarkable especially in high-temperature range

at the same time

the activation energy in reaction decreases;and the reaction rate decreases along with the metamorphic degree of coal increases.