Morphology and microstructure of co-pyrolysis char from bituminous coal blended with lignocellulosic biomass: Effects of cellulose, hemicellulose and lignin
Morphology and microstructure of co-pyrolysis char from bituminous coal blended with lignocellulosic biomass: Effects of cellulose, hemicellulose and lignin
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烟煤与木质纤维素生物质共热解炭的形态和微观结构：纤维素、半纤维素和木质素的影响
DOI：
10.1016/j.applthermaleng.2017.01.061
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发表时间：
2017-04
影响因子：
6.4
通讯作者：
Wang Shuzhong
中科院分区：
文献类型：
--
作者：
Wu Zhiqiang;Yang Wangcai;Chen Lin;Meng Haiyu;Zhao Jun;Wang Shuzhong
煤与木质纤维素类生物质和煤的共热解是其他共热化学转化的关键步骤，而共热解半焦的转化是共气化和共燃烧的速率控制步骤。本文研究了生物质模型化合物（纤维素、半纤维素和木质素，简称CE、HCE和LIG）对共热解半焦结构变化的影响。采用拉曼光谱和扫描电镜（SEM）研究了共热解半焦的碳结构和表面形貌。对不同拟合函数和峰数的拉曼光谱解卷积方法进行了综合比较，发现不少于9个峰的Gaussian-Lorentzian函数解卷积效果最好。三种生物量模型对微结构的变化有不同的影响。CE的加入提高了半焦结构的有序性。HCE促进了微结构的无序化，在质量分数为50%时达到最大值。25%和50%LIG质量比的共热解半焦微观结构变化不明显，75%LIG质量比的共热解半焦的无序化程度增加。应用分形分析方法，用二维和三维分形维数对煤焦表面形貌进行了定量描述。CE降低了共热解的分形维数，HCE和LIG的影响依赖于质量比。
Co-pyrolysis of coal and lignocellulose biomass and coal is the key step of other co-thermochemical conversion, and conversion of co-pyrolysis char is the rate-determining step of co-gasification and co-combustion. In this paper, the influence of biomass model compounds (cellulose, hemicellulose, and lignin, abbreviated as CE, HCE and LIG) on the co-pyrolysis char structure transformation was investigated. Carbon structure and surface morphology of co-pyrolysis char were examined by Raman spectroscopy and scanning electron microscope (SEM). A comprehensive comparison of Raman spectral deconvolution methods based on various fitting functions and peak numbers was explored, and Gaussian-Lorentzian-function with no less than nine peaks showed the best performance. Three biomass model show different effects on the transformation of microstructure structure. The addition of CE increased the ordering of char structure. HCE promoted the disordering degree of microstructure structure and reached the maximum at 50% HCE mass ratio. The microstructure structure changes of co-pyrolysis char for 25% and 50% LIG mass ratios were not evident, while 75% LIG increased the disordering degree of the co-pyrolysis char. Fractal analysis was applied for describing the char surface morphology quantitatively with two and three-dimensional fractal dimensions. CE decreased the fractal dimensions of co-pyrolysis, and the influence of HCE and LIG depended on the mass ratio.
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影响因子：
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作者：
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通讯作者：
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