摘要
本文采用CO2激光器作为加热源,研究固体燃料(煤和桉树)颗粒在氩气气氛下的快速热解过程。将激光诱导击穿光谱(LIBS)技术应用于热解产物(包括C、H、O、CN和C2)的时空分布特性研究。实验结果表明,煤和桉树的热解过程均呈现两个阶段,即脱水脱吸附阶段和大分子分解阶段。在脱水脱吸附阶段,桉树热解析出的含碳氮组分明显多于煤;在大分子分解阶段,桉树各元素析出的峰值时间明显晚于煤,同时桉树析出的挥发分组分中H和O占比更大,而煤析出的挥发分组分中CN和C2占比更大。从残余能量和H光谱强度值与C光谱强度值的比值可以看出,两者的变化规律呈现较好的一致性,证明焦油等大分子组分分布更靠近燃料表面,小分子气体组分的浓度随着高度的增加而增大。
In this paper,a CO2 laser is used as the heating source to study the rapid pyrolysis process of solid fuel(coal and Eucalyptus)particles in an argon atmosphere.Laser-induced breakdown spectroscopy(LIBS)technology is applied to study the temporal and spatial distribution characteristics of pyrolysis products(including C,H,O,CN,and C2).The experimental results show that the pyrolysis process of coal and Eucalyptus presents two stages,namely the dehydration and desorption stage and the macromolecular decomposition stage.In the dehydration and desorption stage,Eucalyptus thermally desorbed more carbon and nitrogen components than coal;in the macromolecular decomposition stage,the peak time of the precipitation of various elements in Eucalyptus is significantly later than that of coal.Besides,in the macromolecular decomposition stage,the proportion of H and O in the volatile components precipitated by Eucalyptus is larger,and the proportion of CN and C2 in the volatile components precipitated by coal is larger.It can be seen from the ratio of residual energy and H spectral intensity value to C spectral intensity value that the change rule of the two presents a good consistency,which proves that the distribution of macromolecular components such as tar is closer to the fuel surface,and the concentration of small molecular gas components increases with height above the sample surface.
作者
赵伟豪
董美蓉
李诗诗
饶刚福
陆继东
Zhao Weihao;Dong Meirong;Li Shishi;Rao Gangfu;Lu Jidong(College of Electric Power,South China University of Technology,Guangzhou,Guangdong 510640,China;Guangdong Province Engineering Research Center of High Efficient and Low Pollution Energy Conversion,Guangzhou,Guangdong 510640,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第17期421-428,共8页
Laser & Optoelectronics Progress
基金
国家自然科学基金面上基金(51976064)
广东省基础与应用基础研究基金(2020A1515010646)。
关键词
光谱学
激光诱导击穿光谱
固体燃料
快速热解
时空分布
析出特性
spectroscopy
laser induced breakdown spectroscopy
solid fuel
fast pyrolysis
temporal and spatial distribution
releasing characteristics
