高变质程度无烟煤热天平二氧化碳加压催化气化动力学——热天平等温热重法

Using sodium carbonate as the catalyst, the carbon dioxide gasification kinetics of the four high rank anthracites （Vad=2.69%～4.35%）was investigated by isothermal thermogravimetric analysis under high pressure. The range of pressure from 0.101MPa to 3.0MPa was tested. The results show that when the pressure is higher than 2.0MPa, the increase of pressure has no effect on the reaction rate. The coal conversion as a function of reaction time was measured at the temperature from 750℃ to 950℃ and at 2.0MPa, which could be preferably correlated by the shrinkingcore model (SCM). According to the reaction rate constant determined by SCM, the reactivity order of the four anthracites is: Yongan Fengshai coal >Yongan Jiashai coal>Yongding coal >Shangjing coal. The activation energies, ranging from 157.21kJ/mol to 185.89kJ/mol, are obtained. The reaction rate constant, activation energy and preexponential factor under high pressure are larger than those of the gasification in CO2 at atmospheric pressure. At 850℃ the power of CO2 partial pressure for Yongan Jiashai coal is 0.34744, which agrees well with the literature.