小龙潭劣质褐煤的热解特性及其动力学模型.doc

小龙潭劣质褐煤的热解特性及其动力学模型



摘要:(TG)和微分热重(DTG)曲线得出:随着热解升温速率的提高,TG曲线向高温侧移动,产生热滞后现象,最大热解速度明显加大;随着煤粉粒度的增大,最终失重量减少;随着热解温度的升高,热解产物的生成量逐渐增加,在400~600℃之间,热解产物的生成速度最快,热解最剧烈;通过线性拟合发现该煤样的热解反应机理为三维扩散反应机理模型,并在已知反应机理函?档那榭鱿虑蠼獬隽嗣貉?的热解反应动力学模型.
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关键词:劣质褐煤; 热解特性; 反应机理; 动力学模型
中图分类号: TK 6文献标志码: A
Abstract: Experimental study on pyrolysis of Xiaolongtan lowgrade brown coal using thermogravimetry was to the analysis of TG and DTG curves,it could be concluded that as the maximum pyrolysis rate increased,TG curves moved to the high temperature phenomenon of thermal hysteresis total weight loss was reduced with the incre
asing of coal particle amount of pyrolysis products increased as the pyrolysis temperature highest amount of pyrolysis products was achieved when the pyrolysis temperature was over the range from 400℃ to 600℃.And the most intense reaction was linear fitting,it could be found that threedimensional diffusionreaction mechanism model satisfied the reaction mechanism of brown coal last,the reaction ics model of brown coal pyrolysis was attained.
Keywords: lowgrade brown coal; pyrolysis characteristics; reaction mechanism; dynamic model
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