Secondary Capture of Chlorine and Sulfur during Thermal Conversion of Biomass
Secondary Capture of Chlorine and Sulfur during Thermal Conversion of Biomass
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DOI：
10.1021/ef049874n
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发表时间：
2005-02
期刊：
影响因子：
5.3
通讯作者：
J. N. Knudsen;P. Jensen;A. W. Lin;K. Dam‐Johansen
中科院分区：
文献类型：
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作者：
J. N. Knudsen;P. Jensen;A. W. Lin;K. Dam‐Johansen
在较大的燃烧设施中，焦炭与氯和硫之间的二次反应可能很重要。本文对生物质焦热转化过程中氯和硫的相互作用进行了实验研究。在实验室规模的固定床反应器中，研究了生物质焦在400−950°C的温度范围内对HCl和SO2的捕获。观察到的反应速率足以在固定床燃烧器的典型条件下发生显著的HCl和SO2再捕获。与生物质中固有的氯和硫含量相比，在整个温度范围内，焦样品中可以保留相对较高的氯和硫含量，在∼600°C时，氯和硫的保留率最高。光谱和化学分析表明，HCl主要被固有的金属物种捕获，而SO2主要被有机基质捕获。因此，最大氯截留率是由固有的物质决定的。
In larger combustion facilities, secondary reactions between char and chlorine and sulfur may be important. In this work, the interactions of chlorine and sulfur with biomass char during thermal conversion have been experimentally investigated. A laboratory-scale fixed-bed reactor was applied to study the capture of HCl and SO2 by biomass char in the temperature range of 400−950 °C. The observed reaction rate was sufficient for significant recapture of HCl and SO2 to occur under conditions typical for fixed-bed combustors. A maximum in the chlorine and sulfur retention existed at ∼600 °C. Relatively high amounts of chlorine and sulfur could be retained in the char samples over the entire temperature range, compared to the inherent chlorine and sulfur content in the biomass. Spectroscopic and chemical analyses revealed that HCl was mainly captured by the inherent metal species, whereas SO2 was mainly captured by the organic matrix. As a result, the maximum chlorine retention was dictated by the inherent me...