Thermogravimetric study on pyrolysis performance and mechanism of coal residue
Thermogravimetric study on pyrolysis performance and mechanism of coal residue
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发表时间：
2006
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通讯作者：
Tang Qiang
中科院分区：
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作者：
Tang Qiang
采用热重法研究了不同地区5种煤渣在不同热解温度、粒度和升温速率条件下的热解过程和热解性能，得到了煤渣热解的特征温度和热解性能参数。分析了煤渣的热解机理，得到了热解机理方程和反应动力学参数。结果表明，热解温度、煤渣种类、颗粒大小和升温速率对煤渣热解过程和热解性能有重要影响。在煤渣热解初期，热解反应受三维全局扩散机理影响，煤渣挥发分不易析出，因此活化能较大，随着温度的升高，挥发分大量析出，活化能降低。煤渣热解第二步发生液化反应，化学反应的级数为3/2，热解结束时二次挥发物的分离需要大量能量，因此活化能会增加。
Studied the pyrolysis process and performance of five kinds of coal residue from different regions under the conditions of different pyrolysis temperature,particle size and heating rate with thermogravimetric method, the characteristic temperature and performance parameter of coal residue pyrolysis were gotten.Also the pyrolysis mechanism of coal residue was analyzed,and the equations of pyrolysis mechanism and parameters of reaction kinetics were obtained.The results show that pyrolysis temperature,coal residue species,particle size and heating rate have an important effect on the pyrolysis process and performance of coal residue.The pyrolysis reaction is subjected to the mechanism of three-dimension global diffusion at the intial pyrolysis phase of coal residue,and the volatiles of coal residue don't separate out easily,so the activation energy is bigger,the volatiles separate out largely with the increasing of temperature and the activation energy will be decreased.The second step of coal residue pyrolysis is subjected to the liquefaction reaction and the progression of chemical reaction is 3/2,the separation of secondary volatiles needs energy heavily at the end of pyrolysis,so the activation energy will be increased.