Devolatilization Characteristics of Shenmu Coal Macerals and Kinetic Analysis
Devolatilization Characteristics of Shenmu Coal Macerals and Kinetic Analysis
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DOI：
10.1080/009083190910361
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
Q. Sun;W. Li;Haokan Chen;Bao-qing Li;Q. Sun
中科院分区：
文献类型：
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作者：
Q. Sun;W. Li;Haokan Chen;Bao-qing Li;Q. Sun
在TG 151热天平上对神木煤显微组分进行了热解实验。研究了一次和二次挥发分的析出规律及挥发分的动力学。主要挥发分是在初次挥发过程中形成的，特别是镜质体。惰质组在一次和二次挥发过程中挥发分的变化表明惰质组具有较高的热稳定性。升温速率对一次和二次挥发分的挥发分含量有影响，但在各温度范围内挥发分含量的大小顺序均为镜质组>母煤>惰质组。用分布活化能模型（DAEM）对脱挥过程进行动力学分析，发现在初始转化率为10%和最终转化率为10%时，脱挥过程的活化能存在较大的误差。并用10%~ 90%的转化率来描述热解过程中活化能的变化。镜质组的活化能在50%转化率附近出现最小值，而惰质组的活化能则随热解的进行而不断增大，表明二者的结构和化学组成不同。惰质组比镜质组具有更高的活化能和更低的热解速率。
The pyrolysis of Shenmu coal macerals was performed in TG151 thermobalance. The volatile matter evolved in primary and secondary devolatilization and devolatilization kinetics were studied. The volatile matter evolved during primary devolatilization is the major part of the total volatile matter, especially for vitrinite. The percentage of volatile matter evolved during primary and secondary devolatilization suggested that inertinite have higher thermal stability. Though the heating rate can affect the percentage of volatile matter evolved during primary and secondary devolatilization, the order of volatile matter in all the temperature range is the same: vitrinite > parent coal > inertinite. The kinetic analysis of devolatilization using distributed activation energy model (DAEM) shows that the activation energy existed relatively large error at the conversion of initial 10% and final 10%. And the conversion of 10% to 90% was used to describe the variation of activation energy during pyrolysis. The activation energy of vitrinite appeared a minimum of about 50% conversion, but that of inertinite always increased as pyrolysis went on, indicating the different structure and chemical composition between them. Inertinite has higher activation energy and lower pyrolysis rate than vitrinite.