程序升温热重法研究神府高温煤焦-CO2气化反应性

Measurement of CO2 Gasification Reactivity for High Temperature Pyrolyzed Coal Chars by Temperature-Programmed Thermogravimetry

摘要: 在制焦温度为1223~1773 K内,制备了慢速和快速神府煤焦,采用程序升温热重法研究了煤焦-CO2高温气化反应性。主要研究了升温速率、制焦温度和热解速率对煤焦反应性的影响,并对一种高温慢速热解焦(制焦温度为1573 K)的程序升温和等温动力学进行了比较。结果表明:升温速率对煤焦-CO2气化反应有明显影响;制焦温度较高的煤焦反应性较低;快速热解有利于提高煤焦的反应性;由程序升温法和等温法所得活化能随转化率变化呈现不同的趋势,但所得活化能的平均值分别为160.13 kJ/mol和163.21 kJ/mol,十分接近。

Abstract: The slow and rapid coal char samples were prepared at elevated temperatures ranging from(1 223 K) to 1 773 K by temperature-programmed and isothermal pyrolysis. Investigations were performed to determine the effects of heating rate,pyrolysis temperature,and pyrolysis rate on the chars,CO_2 gasification reactivity as measured by temperature-programmed thermogravimetry.Reaction kinetics of slow(pyrolysis) at 1 573 K under programmed heating was obtained and compared to that of the isothermal case.The CO_2 gas...