西部煤的热解特性及动力学研究

STUDY ON THE PYROLYSIS AND KINETICS OF COAL OF WESTERN CHINA

采用热重和红外分析法从升温速率与样品粒径的相关性等方面对平朔煤和神东煤的热解特性进行研究,并从动力学上进行分析.结果表明,随升温速率增大,煤样热解反应的初始温度、终止温度以及最大失重速率对应的温度都逐渐升高,但对粒径较小的煤样来说,这些特性温度增加的幅度较大,而最大失重率没有表现出一定的规律性;煤样粒径对热解也有一些影响,但最大失重速率与样品粒径的关系不大.随升温速率增大,热解活化能和频率因子呈现出先增大后减小的趋势.

The pyrolysis characteristics of Pingshuo coal and Shendong coal were studied in detail from the relativity of heating rate and coal particle size and kinetics aspects by means of TG-DTG and FTIR technique. The results show with heating rate increasing the reaction characteristic temperature of coal pyrolysis, such as the initiative, terminative and maximum rate temperature increase gradually, and yet, the final weight loss percent does not indicate definite rule. The change trend of characteristic temperature is more obvious for the coal samples with small particle size than that for big particle size samples, but the biggest weight loss rate has nearly nothing to do with the sample sizes. As pyrolysis rate increase the activation energy and frequency factor increase firstly and then decrease.