Catalytic decomposition of biomass tars: use of dolomite and untreated olivine
Catalytic decomposition of biomass tars: use of dolomite and untreated olivine
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DOI：
10.1016/j.renene.2004.07.014
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发表时间：
2005-04-01
期刊：
影响因子：
8.7
通讯作者：
Kiel, JHA
中科院分区：
文献类型：
--
作者：
Devi, L;Ptasinski, KJ;Kiel, JHA
尽管生物质作为可再生能源正受到越来越多的关注，但仍待解决的剩余问题之一是减少来自生物质气化的产物气体中存在的高水平焦油。本工作的目的是研究橄榄石和白云石对焦油的破坏活性。一些研究人员研究了橄榄石作为生物质气化的床料。但目前还不知道焦油在橄榄石存在下的行为，以及橄榄石是否对焦油有破坏作用。来自实验室规模的常压鼓泡流化床气化炉（位于ECN）的滑流通过放置添加剂的二级固定床反应器。为了便于理解，结果以以下焦油类别表示：GC-不可检测的焦油（类别1）、杂环化合物（类别2）、芳族化合物（类别3）、轻质多环芳族化合物（类别4）、重质多环芳族化合物（类别5）。一般的观察结果是，对于两种添加剂，随着温度从800 ℃升高到900 ℃，所有焦油类的转化率都增加。水溶性杂环化合物可以通过热处理容易地转化。在900 ℃的温度下，水溶性杂环化合物完全转化。纯沙子中的重多环芳烃减少了48%。在900 degreesC下，向砂中添加17重量%的橄榄石导致多环芳烃减少71%，而添加17重量%的（预煅烧）白云石转化率为90%。当在热气净化过程中加入橄榄石和白云石时，也观察到其他焦油类转化率的提高。在900 ℃下，白云石和橄榄石可将4.0 g m（0）（-3）的焦油总量分别降低到1.5和2.2 g m（0）（-3）。尽管总焦油浓度降低，但观察到对焦油露点的影响有限。(C)2004爱思唯尔有限公司保留所有权利。
Although biomass is getting increased attention as a renewable energy source, one of the remaining problems still to be solved is the reduction of the high level of tar present in the product gas from gasification of biomass. The purpose of the present work is to study the activity of olivine and dolomite for tar destruction. Some researchers investigated olivine as bed material for biomass gasification. But it is not yet known how tars behave in the presence of olivine and whether olivine has some activity towards tar destruction. A slipstream from a lab-scale atmospheric bubbling-fluidised-bed gasifier (located at ECN) is passed through a secondary fixed-bed reactor where the additives are placed. For easy understanding, the results are represented in terms of the following tar classes; GC-undetectable tars (class 1), heterocyclic compounds (class 2), aromatic compounds (class 3), light polyaromatic compounds (class 4), heavy polyaromatic compounds (class 5). The general observation is that the conversion of all tar classes increases as the temperature was raised from 800 to 900degreesC for both additives. The water-soluble heterocyclic compounds can be easily converted by thermal treatment. At the temperature of 900degreesC, the water-soluble heterocyclic compounds are completely converted. A 48% decrease in heavy PAHs is observed with pure sand. Addition of 17 wt% olivine to the sand leads to a 71% decrease of PAHs at 900degreesC, whereas addition of 17 wt% (pre-calcined) dolomite converted 90%. Also improvement in conversion of other tar classes is observed when olivine and dolomite are added during hot gas cleaning. A total tar amount of 4.0 g m(0)(-3) could be reduced to 1.5 and 2.2 g m(0)(-3) using dolomite and olivine, respectively, at a temperature of 900degreesC. Inspite of this reduction in total tar concentration, a limited impact on the tar dewpoint is observed. (C) 2004 Elsevier Ltd. All rights reserved.