基于光闪烁法的油雾浓度在线检测方法研究  

Oil Mist Concentration On-line Measurement by Optical Scintillation Method

作　　者：林光耀 胡飞 姬忠礼 刘震 LIN Guangyao;HU Fei;JI Zhongli;LIU Zhen(Beijing Key Laboratory of Process Fluid Filtration and Separation,College of Mechanical and Transportation Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院过程流体过滤与分离技术北京市重点实验室,北京102249

出　　处：《光子学报》2024年第1期103-117,共15页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2021YFB3801304);国家自然科学基金(No.51904315)。

摘　　要：针对压缩机出口除油器效率性能评价,提出一种基于光闪烁法的润滑油油雾液滴浓度在线检测方法。基于颗粒系层模型和Lambert-Beer定律,以层测量体透过率作为泊松分布随机变量,推导了光闪烁法在长光程平行光束下的颗粒浓度检测模型。闪烁频率根据测量体大小、颗粒直径和颗粒速度确定,并通过影响闪烁信号的拟合方差影响检测精度。对于某型压缩机润滑油,通过光谱扫描和主成分分析法确定了在可见光波段,400 nm波长光束具有最佳的检测灵敏度和正相关性。实验结果表明,相较于光透射法,在0~50 mg·m^(−3)油雾浓度范围内基于光闪烁法检测标定结果误差小于10%,线性相关系数R2=0.989。In order to evaluate the efficiency and performance of the natural gas compressor outlet oil separator,a concentration detection method of micro-nano-scale oil mist droplets based on the light scintillation theory was proposed for the low-concentration lubricating oil mist downstream of the compressor outlet oil mist separator under the condition of 0~50 mg·m−3 low concentration oil mist concentration.Based on the particle phylolayer model,Lambert-Beer law and Poisson distribution,the theoretical model uses the total scattering theory to derive the particle concentration calculation model under the long-optical path parallel uniform beam by segmenting the measuring volume in the beam field and taking the transmittance of each monolayer measuring volume as the statistical random variable of Poisson distribution,and explains the causes and influencing factors of the optical scintillation method.For compressor lubricants in the natural gas industry,ISO viscosity grade 460 lubricants were selected,and spectral scanning and Principal Component Analysis(PCA)determined that the 400 nm wavelength beam had the best detection sensitivity and positive correlation in the visible light band.At the same time,the infrared spectrum and three-dimensional fluorescence spectrum of lubricating oil show that the infrared band has a strong absorption effect in hydrocarbon gas medium,and the fluorescence effect of lubricating oil in the ultraviolet band will aggravate the stray light in the optical path and affect the test accuracy.For the flicker frequency in the optical scintillation method,the selection of the flicker frequency is determined by the spectral change measurement,and the selection of the flicker frequency affects the detection accuracy by affecting the fitting variance of the scintillation signal,and the flicker frequency is determined according to the size of the measuring body,particle diameter and particle velocity.The results show that in the range of 0~50 mg·m−3 oil mist concentration,there is an obvious line

关 键 词：光闪烁法 润滑油油雾 颗粒浓度测量 光闪烁频率 最佳检测波长 

分 类 号：TE868[石油与天然气工程—油气储运工程]