摘要
为推进甲烷爆炸感应期内探测与抑制技术的发展,利用小尺度气体爆炸实验装置进行了12个体积分数的甲烷爆炸实验,采用光谱比较法、谱线强度比较法和加权因子法等火焰发射光谱分析方法对实验得到的甲烷爆炸感应期内C2自由基及其特征光谱出现频率、相对强弱等特征进行分析。研究表明,甲烷爆炸感应期内存在C2自由基,并且Phillips近红外系统谱带、Mulliken’s系统谱带、Swan系统谱带、Fox-Herzberg系统谱带出现概率较高,被探测到的概率较大,适宜用作辨识甲烷爆炸信号。C2含量在甲烷体积分数9.5%附近时最大,在9.5%之前,随着甲烷体积分数的增加而增大,在达到9.5%之后,随着甲烷体积分数增加而减小。实验条件下C2各特征光谱中,Phillips近红外系统谱带、Swan系统谱带、Fox-Herzberg系统谱带分别在771,590,289 nm处特征光谱相对较强,这些光谱强度较强的谱线适于用作辨识自由基和瓦斯爆炸信号的依据。
The characteristic spectrum of C2 in the induction period of methane explosion was analyzed by comparison method of spectrum and spectral line intensity and weighted factor method,which belongs to the small-scale methane explosion experiments with 12 different methane concentrations. This study was helpful for developing the technique of the gas explosion detection and suppression. It is educed that C2 exists in the flame of methane explosion in induction period. Phillips bands,Mulliken＇s bands,Swan bands and Fox-Herzberg bands in the flame appear frequently with a high detecting probability. So,the characteristic spectrum of these bands can be used for detecting methane explosion. The content of C2 gets the most when the methane concentration gets 9. 5%,before that the content of C2 increases with the methane concentration increasing,and after that the content of C2 decreases with the methane concentration increasing. In the experiment,the spectral intensity of Phillips bands,Swan bands,and Fox-Herzberg bands is relatively bigger at 771,590,289 nm respectively,which can be used to identify the radicals and the signals of methane explosion.
出处
《西安科技大学学报》
CAS
北大核心
2015年第2期248-252,共5页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(51104164
51174157)
武警学院青年教师计划课题(QNJS201324-25)
关键词
甲烷爆炸
感应期
C2自由基
特征光谱
methane explosion
induction period
C2
characteristic spectrum
