Comparative study of pyrolysis behaviors of corn stalk and its three components
Comparative study of pyrolysis behaviors of corn stalk and its three components
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玉米秸秆及其三种组分热解行为对比研究
DOI：
10.1016/j.jaap.2013.08.005
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发表时间：
2013-11-01
影响因子：
6
通讯作者：
Kong, Fangong
中科院分区：
文献类型：
--
作者：
Lv, Gaojin;Wu, Shubin;Kong, Fangong
为了更好地了解玉米秸秆热解机理，进一步优化工艺，在管式炉中进行了不同温度（300 ~ 900 ℃）下玉米秸秆及其3种主要组分（半纤维素、纤维素和木质素）热解特性的放大实验。深入讨论了热解产物（气体、焦油和焦炭）的分布、温度的影响以及各组分对原始生物质热解的影响和贡献。研究发现，对于每种样品的热解，热解温度对不同产物的产率和性质都有很大的影响。最大焦油产率的最佳温度被发现在450 ℃和500 ℃之间。高温（>600 ℃）有利于气体产物的生成，并伴随着焦油和焦炭产率的降低。由于其独特的化学结构，从分析结果中得出了各组分热解产物特征的深刻差异。在三种组分中，半纤维素产生最高的CO2和H-2产率，纤维素具有最高的CO产率，而木质素产生显着更多的CH 4。半纤维素焦油中主要含有酮类、酸类和呋喃类物质，纤维素焦油中醛类和呋喃类物质含量较高，木质素焦油中主要含有单体酚类和2，3-二氢苯并呋喃。此外，SEM图像还揭示了焦的表面形貌的显着差异。皇冠版权所有（C）2013由爱思唯尔B. V.出版保留所有权利。
To better understand the pyrolysis mechanism for further process optimization, the pyrolysis characteristics of corn stalk and its three major components (i.e. hemicellulose, cellulose and lignin) were investigated and compared by amplifying experiments in a tubular furnace at different temperatures (from 300 degrees C to 900 degrees C). The distributions of pyrolysis products (in terms of gas, tar and char), the influence of temperature, the impacts and contributions of each single component on the pristine biomass pyrolysis were discussed in depth. It was found that, for each sample pyrolysis, the pyrolysis temperature played a huge role on the yields and properties of different products. Optimal temperatures for maximum tar yield were found to be between 450 C and 500 C. The high temperature (>600 C) was favorable to generate gas products, accompanied by a reduction of tar and char yields. Because of their unique chemical structures, profound differences about the characteristics of pyrolysis products from each component were drawn from the analysis results. Among the three components, hemicellulose produced the highest CO2 and H-2 yields, cellulose owned the highest CO yield, while lignin generated significantly more CH4. As for tars, hemicellulose tar mainly contained ketones, acids and furans, cellulose tar displayed higher aldehydes and furans, lignin tar was dominated by monomeric phenols and 2,3-dihydro-benzofuran. In addition, the SEM images also revealed the marked differences in the surface morphology of the chars. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.