Pyrolysis of rice husk
Pyrolysis of rice husk
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发表时间：
2004-10
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影响因子：
1
通讯作者：
Anshu Bharadwaj;Y. Wang;S. Sridhar;V. Arunachalam
中科院分区：
文献类型：
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作者：
Anshu Bharadwaj;Y. Wang;S. Sridhar;V. Arunachalam
稻壳灰分高，碳转化效率低，是一种难于气化和流态化燃烧的燃料。本文报道了单个稻壳颗粒在共焦扫描激光显微镜控制气氛下的热解实验结果，并对其热解结构进行了扫描电子显微镜观察。结果表明，颗粒在横向上优先收缩，这意味着存在强大的惰性二氧化硅层，即使在高温下仍保持其结构。纤维素组分和木质素组分优先消耗在几何排列的孔和通道中。二氧化硅的作用似乎不仅仅是一个几何屏障，因此可能无法实现完全的碳转化。
Rice husk has proved to be a difficult fuel for gasification and fluidized bed combustion because of the high ash content resulting in carbon conversion inefficiency. We report the results of pyrolysis experiments of individual rice husk particles under controlled atmospheres of the confocal scanning laser microscope followed by SEM observations of the pyrolized structure of the particles. The results suggest a preferential shrinkage of the particles in the transverse direction, implying the presence of strong and inert silica layer that retains its structure despite high temperatures. The cellulose and lignin component was preferentially consumed in geometrically arranged pores and channels. The role of silica appears to be more than just a geometric shield and thus complete carbon conversion may not be achievable.