Structure characteristics and gasification activity of residual carbon from updraft fixed-bed biomass gasification ash
Structure characteristics and gasification activity of residual carbon from updraft fixed-bed biomass gasification ash
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上升气流固定床生物质气化灰残炭的结构特征及气化活性
DOI：
10.1016/j.enconman.2016.12.091
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发表时间：
2017-03-15
影响因子：
10.4
通讯作者：
Gao, Jinsheng
中科院分区：
文献类型：
--
作者：
Huang, Sheng;Wu, Shiyong;Gao, Jinsheng
采用拉曼光谱、孔结构分析仪和热重分析仪研究了5 MW商业上吸式固定床气化电厂生物质灰中残碳的结构特征和气化活性。在所研究的生物质气化灰中，一些残碳含量相对较高的馏分可能作为气化炉的燃料回收。生物质气化灰渣中残余碳的晶体结构组织较差，其总活性位（sp（2）和sp（2）-sp（3）混合键）的大小顺序为：飞灰>稻草>底灰。气化灰渣中的残碳比稻草有更大的比表面积和更高的气化活性。与粉煤灰相比，底灰中的残余碳具有更低的比表面积、更有序的碳晶体结构和更少的总活性中心。因此，底灰中的残余碳表现出较低的气化活性。气化灰中的残余碳通常被认为是“未燃尽碳”，可能来源于部分气化碳和未反应的热解碳。(C)2016爱思唯尔有限公司版权所有。
The structure characteristics and gasification activity of residual carbon in biomass ash from a 5 MW commercial updraft fixed-bed gasification power plant were investigated using a Raman spectroscopy, a pore structure analyzer and a thermo-gravimetric analyzer. In the investigated biomass gasification ashes, some fractions with a relatively high residual carbon contents could be probably recycled as fuel of gasifier. The crystalline structure of residual carbons in biomass gasification ashes were poorly organized, and the total active sites (sp(2) and mixed sp(2)-sp(3) bond forms) of residual carbons with were ordered as: fly ash > rice straw > bottom ash. The residual carbons in gasification ashes had a higher surface area and a higher gasification activity than those of rice straw. The residual carbons in bottom ashes had a lower surface area, more ordered carbon crystalline structures and less total active sites than those of fly ash. Consequently, the residual carbons in bottom ashes presented a lower gasification activity. The residual carbon which was generally considered as "unburnt carbon" in gasification ashes were probably originated from partly-gasified carbons and unreacted pyrolytic carbons. (C) 2016 Elsevier Ltd. All rights reserved.