基于激光吸收光谱的烷烃泄漏遥测技术

Remote measurement technology of alkanes leakage based on laser absorption spectroscopy

本文旨在满足石化厂区对多种烷烃泄漏气体的远程遥测需求,并考虑到这些石化储罐多位于海边,因此需要考虑水汽谱线对烷烃谱线的影响。为排除空气中水汽和二氧化碳的影响,选择了丙烷中红外波段3364 nm的吸收峰。通过使用ICL激光器,在此波段实现了对丙烷和正丁烷两种气体的同时测量。提出了一种开放光程的方法,将反射膜放置在距离100 m外,通过镜头将返回的光聚集到探测器上,从而实现对100 m距离内烷烃气体的远程遥测分析。本文提供了两种气体在100 m处的吸收信号和谐波信号的数据,并根据谐波信号和噪声的分析,计算出待测气体的检测限低于100 ppm·m。

This study aims to address the remote measurement requirements for multiple alkane gas leaks in petrochemical plant areas,taking into account the effect of water vapor spectra on alkenes spectra as most of these petrochemical storage tanks are located at the sea side.To eliminate the influence of water vapor and carbon dioxide in the air,the absorption peak of propane at an infrared wavelength of 3364 nm is selected.By using an ICL laser,simultaneous measurement of both propane and n-butane gases in this band is achieved.Furthermore,an open light range method is proposed where a reflective film is placed at a distance of 100 meters and the returned light is gathered through a lens onto a detector,thus enabling remote telemetry analysis of alkane gases at a distance of 100 meters.This paper presents data on the absorption signals and harmonic signals of the two gases at 100 meters.Based on the analysis of harmonic signals and noise,the detection limit for the gas to be tested is calculated to be less than 100 ppm·m.