Use of Alkali Carbonate Sorbents for Capturing Chlorine-Bearing Gases from Corn Straw Torrefaction
Use of Alkali Carbonate Sorbents for Capturing Chlorine-Bearing Gases from Corn Straw Torrefaction
复制标题
使用碱金属碳酸盐吸附剂捕获玉米秸秆烘焙中的含氯气体
DOI：
10.1021/acs.energyfuels.8b01976
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发表时间：
2018
期刊：
影响因子：
5.3
通讯作者：
Levendis, Yiannis A.
中科院分区：
文献类型：
--
作者：
Ren, Xiaohan;Rokni, Emad;Zhang, Lei;Wang, Zhuozhi;Liu, Yu;Levendis, Yiannis A.
燃烧碳化生物质发电比燃烧原料生物质有许多优点，其中之一是含氯气体的排放量更低。这是因为这些气体的部分演化发生在焙烧过程中；因此，所得到的碳化生物质比其原料生物质前体具有更低的氯质量分数。研究表明，在玉米秸秆发酵过程中，进化气体（torgas）中主要的氯化物质是CH3Cl和HCl。前者在温度低于350°C时更为普遍，而后者在更高温度下更为丰富。在这项工作中，玉米秸秆在常压下，在惰性氮流中，在300°C的炉温下固化20分钟。在这种条件下，玉米秸秆的原始质量损失了近40%，氯的质量损失了73%。为了控制氯化物质的排放，焙烧气体与碳酸碱吸附剂床在25-500℃的温度范围内进行非均相反应。结果表明，吸附剂对HCl的吸附效果优于CH3Cl，吸附剂的吸附效果随吸附剂的种类和反应温度的变化而变化。在此条件下，HCl的去除率在26 ~ 80%之间变化，CH3Cl的去除率在15 ~ 22%之间变化。发现碳酸钾（K2CO3）比碳酸钠（Na2CO3）稍微有效，比碳酸钙（CaCO3）明显有效，特别是在低反应温度下。
Combustion of torrefied biomass for power generation has many advantages over combustion of raw biomass, one of which is lower emissions of chlorine-bearing gases. This is because partial evolution of these gases takes place during the torrefaction process; hence, the resulting torrefied biomass has a lower chlorine mass fraction than its raw biomass precursor. Research showed that, during torrefaction of corn straw, the predominant chlorinated species in the evolving gas (“torgas”) are CH3Cl and HCl. The former is more prevalent when torrefaction takes place at temperatures under 350 °C, whereas the latter is more abundant at higher temperatures. In this work, corn straw was torrefied at a furnace temperature of 300 °C for 20 min under atmospheric pressure in an inert nitrogen flow. Under this condition, corn straw lost nearly 40% of its original mass, along with 73% of its chlorine mass to the gas phase. To control the emissions of the chlorinated species, the torrefaction gas was heterogeneously reacted with beds of alkali carbonate sorbents kept at temperatures in the range of 25–500 °C. It was determined that the sorbents captured HCl more effectively than CH3Cl, with amounts varying with both the type of sorbent and the sorbent/gas reaction temperature. HCl removal effectiveness varied in the range of 26–80%, whereas CH3Cl removal effectiveness varied in the range of 15–22% at the conditions implemented herein. Potassium carbonate (K2CO3) was found to be slightly more effective than sodium carbonate (Na2CO3) and significantly more effective than calcium carbonate (CaCO3), particularly at low reaction temperatures.
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影响因子：
7.4
作者：
Ren, Xiaohan;Sun, Rui;Levendis, Yiannis A.
通讯作者：
Levendis, Yiannis A.
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影响因子：
8.6
作者：
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通讯作者：
K. Klabunde
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DOI：
--
发表时间：
2009
期刊：
Powder Technology 190
影响因子：
--
作者：
H. Kudo;K. Shigematsu;K. Mitani;T. Nishikubo;N. C. Kasuga;H. Uekusa;and Y. Ohashi,;Yasuo Ohtsulca
通讯作者：
Yasuo Ohtsulca
影响因子：
4.4
作者：
Panahi, Aidin;Tarakcioglu, Mahmut;Levendis, Yiannis A.
通讯作者：
Levendis, Yiannis A.