Characterization of Zhundong lignite and biomass co-pyrolysis in a thermogravimetric analyzer and a fixed bed reactor
Characterization of Zhundong lignite and biomass co-pyrolysis in a thermogravimetric analyzer and a fixed bed reactor
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DOI：
10.1016/j.energy.2017.11.141
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发表时间：
2017-12
期刊：
影响因子：
9
通讯作者：
Feiqiang Guo;Xiaolei Li;Yan Wang;Yuan Liu;Tiantao Li;Chenglong Guo
中科院分区：
文献类型：
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作者：
Feiqiang Guo;Xiaolei Li;Yan Wang;Yuan Liu;Tiantao Li;Chenglong Guo
利用热重分析仪和固定床反应器研究了准东褐煤与松木木屑的共热解特性。研究发现，得到的活化能普遍低于计算值。特别是在0.2~0.6的转化率范围内，混合物的大部分相对偏差值都低于−10%，说明准东褐煤和松木屑在非等温热解过程中挥发分的释放具有正的协同效应。固定床等温裂解实验得到的气产率大于计算值，而焦油和焦炭的实验值都变低了。当ZD和PS的质量比分别为1：1和2：1时，焦油和气体产物表现出明显的协同效应，说明可以提供足够的供氢体来促进降解反应。CO、H_2、CO_2和CH_4四种主要气体组分的实验产率均高于计算值。扫描电子显微镜结果表明，准东褐煤和松木屑残炭都变得更加多孔，准东褐煤中的金属盐挥发并凝聚在准东褐煤和松木屑表面，在共热解过程中可能起到催化剂的作用。
The co-pyrolysis characteristics of Zhundong lignite and pine sawdust were investigated in a thermogravimetric analyzer and a fixed bed reactor. This study found that the obtained activation energies were generally lower than the calculated values. Particularly in the conversion range of 0.2–0.6, most of the relative deviation values was lower than −10% for the blends, indicating positive synergistic effect between Zhundong lignite and pine sawdust in volatiles release during non-isothermal pyrolysis. From the isothermal pyroylysis in the fixed bed reactor, the experimental values of gas yield were greater than the calculated, while both experimental tar and char yields became lower. Pronounced synergy effect occurred at ZD and PS mass ratio of 1:1 and 2:1 for tar and gas product, indicating that enough hydrogen-donors could be provided to promote degradation reactions. The experimental yields of four main gas components, CO, H2, CO2and CH4, were all higher than that of the calculated values. SEM results indicated both Zhundong lignite and pine sawdust residue chars became more porous, and metals salt in Zhundong lignite volatilized and condensed on the surface of Zhundong lignite and pine sawdust, which may perform as catalyst during co-pyrolysis.