激光拉曼光谱气体分析的研究.pdf

石油化
1162
PETROCHEMICAL TECHNOLOGY
2015年第44卷第10期
激光拉曼光谱气体分析的研究
刘逸,王国清,司字辰,张兆斌
(中国石化北京化工研究院,北京100013)
[摘要]通过改进及优化激光拉曼光谱仪的相关性能,得到了较稳定的激光拉曼光谱基线;考察了环境温度、积分时间和测
试压力等因素对激光拉曼光谱响应信号的影啊,并对实验条件进行了优化;采用激光拉曼光谱仪对乙烯装置裂解气中的6种基
础气体H2,CH4,C2H4,C2H6,CH,C2H的含量进行了测定。实验结果表明,优化的实验条件为环境温度23.5℃、积分时
间25s、测试压力0.5MPa;在优化的实验条件下,激光拉曼光谱法的分析结果与气相色谱法的分析结果大致相当,且两种方
法的重复性实验的相对标准偏差均小于2%,表明激光拉曼光谱法具有较好的重复性。相对于气相色谱法,激光拉曼光谱气体
分析法有利于加快分析数据的反馈速度,并降低分析成本。
[关键词]激光拉曼光谱;气体分析;气态烃;乙烯;裂解炉
文章编号]1000-8144(2015)10-1162-06
「中图分类号]TQ075
[文献标志码]A
Preliminary Study on Gas Analysis by Laser Raman Spectroscopy
Liu Yi, Wang Guoqing, Si Yuchen, Zhang Zhaobin
(SINOPEC Beijing Research Institute of Chemical Industry, Beijing 100013, China)
I Abstract] A stable laser Raman spectrum baseline was obtained by improving and optimizing the
performances of the laser Raman spectrometer. The effects of environmental temperature, integration
time and test pressure on the Raman signals were investigated. 6 Basic components in pyrolysis gas
namely H2, CH4, CH, C2 Hs, C; Hs and C Hs, were determined by means of the laser Raman
spectrometer. It was showed that under the optimal conditions of environmental temperature 23.5
"C, integration time 25 s and test pressure 0.5 Mpa, the results analyzed by GC and the laser Raman
spectrometer were roughly equivalent, and all the relative standard deviations of the two methods
were smaller than 2%0, which meant the established Raman analysis method had good repeatability
Compared to the GC analysis, the laser Raman spectroscopy can improve the data feedback speed and
reduce the analysis cost
I Keywords J laser Raman spectroscopy; gas analysis; gaseous hydrocarbons; ethylene; cracking
在乙烯生产过程中,对裂解原料及产物的分来,快速分析技术越来越多地被应用到石化领域的
析评价,有利于把握裂解深度、了解裂解炉的运原料及产物分析中
行状况、指导工艺参数的优化。以裂解气分析为
由于烃类主要包含的脂肪链、芳香环等极性
例,现有的分析方法主要为气相色谱法,它的优点较弱的部分及CC和C一C等振动时偶极矩变化较
是分析结果全面、信息量大,但耗时较长。随着裂製小的基团在拉曼光谱中信号强烈?,且以激光为光
解炉产能的加大及裂解原料的多样性,对反馈生产源的拉曼光谱技术整合了激光功率密度高、方向
指标的分析技术也提出了更新更高的要求。近年性好、相干性好的特点?,在石化领域具有较好的
[收稿日期]2015-08-13;[修改稿日期」2015-08-28。
「作者简介]刘逸(1981-),女,重庆市人,博士,高级工程师,电话010-59202284,电邮lyi.bjhy(@sinopec.com
[基金项目]国家重大科学仪器设备开发专项课题“激光拉曼光谱气体分析仪的研发与应用”(2012YQ160007)。