炼焦生产典型煤种热解动力学试验研究

Experiment and research on the pyrolysis kinetics of typical coal for coke making

对炼焦生产过程典型煤样进行了工业分析、元素分析以及热性能分析,结果表明,神府气煤在整个升温区间的失重最大,而西曲焦煤和王家岭瘦煤的失重最小,其余煤种介于两者之间。煤样的失重量与其挥发分和水分之和具有关联性。DTG分析表明,气煤的最大热解速度较大,热解较为集中,挥发分释放速度快,热解特性参数较大;而瘦煤和较高变质程度的焦煤最大热解速度较低,热解温度区间分散,挥发分释放速度慢,热解特性参数小;肥煤和1/3焦煤处于他们之间。动力学解析表明,三个独立的一级反应可以很好地描述所研究煤样的热解反应过程,几种典型煤样的活化能介于64~91 kJ/mol之间。神府和玉成煤的平均活化能最小,热解过程比较容易发生;西曲煤的平均活化能最大,热解过程进行困难。

Some typical coals for coke making were tested.Items of test included proximate analysis and ultimate analysis and thermal analysis.The results of experiment showed Shenfu gas coal had the most weight loss and Xiqu coking coal and Wangjialing lean coal had the least and weight loss of other coal samples were in between during the whole heating-up temperature range.Weight loss of the coal had a good correlation with the sum of volatile matter and water.According to analysis of TG and DTG,in comparison with other coals,the gas coal had highest maximum weight loss rate and the lean coal and the high metamorphic coking coal had the lowest.Pyrolysis temperature range of the gas coal was the most concentrative of fourteen coals and the lean coal and the high metamorphic coking coal were the most dispersive.The release rate of volatile matter of the gas coal was fast and that of the lean coal and the high metamorphic coking coal were slow.The value of pyrolysis specifications of the gas coal was big and that of the lean coal and the high metamorphic coking coal were small.The characteristic values of the fat coal and the one third coking coal were in between.Kinetics investigation revealed three single one order reaction could describe pyrolysis characteristic of fourteen coals researched well.The average activation energy values of several typical coal were between 64 kJ/mol and 91 kJ/mol.Average activation energy of Shenfu coal and Yucheng coal were the least so theirs pyrolysis process were easily,but that of Xiqu coal was the biggest therefore pyrolysis reaction of Xiqu coal was the most difficult.