基于激光技术结合温度修正的高温HF气体检测方法研究（英文）

发布时间：2018-05-16 02:22

本文选题：激光吸收光谱 + 温度修正　；参考：《光谱学与光谱分析》2017年03期

【摘要】：氟化氢(HF)是变电站气体绝缘开关进行故障诊断的重要特征气体之一,因此HF气体的高测量精度,快速响应,实时在线检测的方法是工业和环境领域的研究重点之一。结合激光吸收光谱技术和蒙乃尔钢材加工的耐腐蚀多次反射池搭建HF检测实验系统;分析了HF气体在不同温度下的激光吸收光谱特性,根据HITRAN数据库的HF气体配分函数系数得到配分函数曲线和吸收线强曲线;在研究工作中重点设计了结合激光光谱解析和温度参数修正的浓度反演算法以实现气体浓度的准确检测;结合多次反射吸收池的温度特性利用不同浓度配比的HF样气得到连续实验结果。多次反射池加热后并稳定工作在313和323 K时,温度修正前浓度反演的最大相对误差分别为5.33%和5.87%,温度修正后浓度反演的最大相对误差分别为1.20%和1.47%。通过连续检测和计算,系统在323K时HF检出限为8.7×10~(-5)mmol·mol~(-1),高于290K时的检出限6.3×10~(-5)mmol·mol~(-1)(20 m光程)。尽管高温环境下温度修正后的检测误差大于室温情况,但是同一高温下温度修正后的检测误差仍低于未经过温度修正的值。通过该研究证明了本浓度反演算法工作稳定、可靠,可以满足化工生产现场HF实时监测的需求,对于我国工业HF气体的安全排放监管和环境保护起有效的技术支持。
[Abstract]:HFF is one of the most important characteristic gases for fault diagnosis of gas insulated switches in substation. Therefore, the method of high measuring accuracy, fast response and real-time on-line detection of HF gas is one of the research focuses in industrial and environmental fields. Combined with laser absorption spectrum technology and corrosion resistant multi-reflection cell of Monel steel processing, the HF detection system was built, and the laser absorption spectrum characteristics of HF gas at different temperatures were analyzed. According to the partition function coefficient of HF gas in HITRAN database, the partition function curve and the intensity curve of absorption line are obtained. In order to realize the accurate detection of gas concentration, a concentration inversion algorithm based on laser spectral analysis and temperature parameter correction is designed. Combined with the temperature characteristics of the multiple reflectance absorption cell, continuous experimental results were obtained by using HF gas with different concentrations. After heating and working stably at 313 and 323 K, the maximum relative error of concentration inversion before temperature correction is 5.33% and 5.87, respectively, and the maximum relative error after temperature correction is 1.20% and 1.47%, respectively. By continuous detection and calculation, the detection limit of HF at 323K is 8.7 脳 10~(-5)mmol molan-1, which is higher than the detection limit of 6.3 脳 10~(-5)mmol mol~(-1)(20 m optical path at 290K. Although the error of temperature correction is larger than that of room temperature at high temperature, the error of temperature correction at the same temperature is still lower than that without temperature correction. It is proved that this concentration inversion algorithm works stably and reliably and can meet the needs of real-time monitoring of HF in chemical production sites. It can provide effective technical support for the safe emission regulation and environmental protection of industrial HF gas in China.
【作者单位】：中国科学院环境光学与技术重点实验室安徽光学精密机械研究所;中国科学技术大学;
【基金】：The National Key Scientific Instrument and Equipment Development Projects(2012YQ22011902) The 863 National High Technology Research and Development Program of China(2014AA06A503)
【分类号】：TN249

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