甲烷爆炸感应期内CN/CH/CHO/CH_2O/NCN特征光谱分析

为开发可燃气体爆炸感应期内探测与抑制技术,采用小尺度实验和光谱分析的方法,对甲烷爆炸感应期内CN,CH,CHO,CH2O,NCN等含单C自由基特征光谱进行分析。得出甲烷爆炸感应期内火焰中存在CN,CH,CHO可能性较大;CN的红色谱带出现频率较高,有较大概率被探测到,适宜作为辨识甲烷爆炸的信号;CN在甲烷体积分数9.5%附近最高;CH含量随着甲烷体积分数的增加而减小;CHO含量与甲烷体积分数相关性较弱;实验条件下各自由基出现10次以上的特征光谱中,CN的红色谱带光谱强度随着波长的增加而增加,在938 nm处相对最强,CHO的Vaidya’s谱带在311,318,353 nm处光谱强度相对较强。

Analysis of characteristic spectrum of CN/CH/CHO/CH2O/NCN in induction period of methane explosion

The characteristic spectrum of CN/CH/CHO/CH2O/NCN in the induction period of methane explosion obtained from a small-scale experiment was analyzed by spectrum analysis，which is used for developing the technique of gas explosion detection and suppression.It is educed that CN，CH，CHO exist in the flame during the induction period of methane explosion in all probabilities.The CN red system bands appear frequently in the flame，and the probability of detecting them is very high.Therefore，the characteristic spectrum of these bands can be used for detecting methane explosion.The contents of CN are high when the methane concentration getting 9.5%.The contents of CH decrease with the increase of methane concentration.The contents of CHO are weakly correlated with the concentration of methane.In the experiment，the spectral intensity of CN red system bands increases with the increase of wavelength，and is relatively bigger at 938 nm.The spectral intensity of CHO Vaidya’s bands is relatively bigger at 311，318 and 353 nm.