Characterization of tar from sawdust gasified in the pressurized fluidized bed
Characterization of tar from sawdust gasified in the pressurized fluidized bed
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加压流化床气化锯末焦油的表征
DOI：
10.1016/j.biombioe.2006.06.017
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发表时间：
2007-04
影响因子：
6
通讯作者：
Huang, HaiFeng
中科院分区：
文献类型：
--
作者：
Wu, ZhiBin;Qin, YuHong;Li, Wenying;Feng, Jie;Xie, KeChang;Huang, HaiFeng
研究了新型加压流化床中木屑气化释放焦油的特性。采用凝胶渗透色谱法（GPC）测定木屑气化焦油的平均分子量和分子量分布，并采用光电二极管阵列（PDA）平行检测器对210 ~ 380nm范围内的紫外（UV）光谱进行分析。在压力为0.5 ~ 2.0 mpa、温度为800℃时，焦油的分子量分布与平均分子量相近，在254nm处吸收的紫外光谱显示，不同压力下木屑空气气化焦油具有芳香性，且芳香性随压力的增加而增加。温度从700℃升高到900℃，不同分子量分布组分的相对含量表明，焦油中小分子量组分的含量较高。由此可见，在气化条件下，焦油随着温度的升高而逐渐分解。在700 ~ 900°C范围内，254nm紫外吸收结果显示了相似的芳族特征，表明存在较大的多核芳环体系、不饱和共轭长链烷基、杂环结构和杂原子取代烷基。
The paper investigated the features of tar releasing from sawdust gasification in a new designed pressurized fluidized bed. Gel permeation chromatography (GPC) was used to determine the average molecular weight and the molecular weight distribution of sawdust gasified tar, also a photodiode array (PDA) detector was used in parallel to analyze the Ultraviolet (UV) spectra from 210 to 380nm. At the pressure of 0.5–2.0MPa and 800°C, tar had the similar molecular weight distribution and the average molecular weight, the UV spectra absorbed at 254nm revealed tar of sawdust air gasification at different pressures had aromatic character which increased with the increment of the pressure. By increasing the temperature from 700 to 900°C, the relative amount of different molecular weight distribution fractions showed that tar contained higher fractions of small molecular weight components. It so gave an indication that tar progressively broke down with the increment of temperature under gasification conditions. The results from the UV absorbed in 254nm showed a similar aromatic characteristic between 700 and 900°C, which expressed the presence of larger polynuclear aromatic ring systems, unsaturated conjugated long chain alkyl, heterocyclic structures and alkyl of heteroatom substitutions.
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