基于二极管激光消光光谱的高温气体与颗粒物同时探测研究  

Simultaneous detection of particle and C2H2 at high temperature using tunable diode laser extinction spectroscopy

作　　者：张铭珂 高振威 高光珍 江宇豪 蔡廷栋 Zhang Ming-Ke;Gao Zhen-Wei;Gao Guang-Zhen;Jiang Yu-Hao;Cai Ting-Dong(School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]江苏师范大学物理与电子工程学院,徐州221116

出　　处：《物理学报》2022年第19期85-91,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61875079,61805110,61475068,11104237);江苏省重点研发计划(批准号:BE2021634);徐州市推动科技创新项目重点研发计划(批准号:KC19202);江苏省碳达峰碳中和科技创新专项(批准号:BE2022314)资助的课题。

摘　　要：化石燃料燃烧过程中产生的碳烟颗粒物是大气细粒子(PM2.5)的主要来源,这些大量产生的碳烟颗粒物也是影响燃烧效率的重要因素;乙炔(C_(2)H_(2))作为碳烟生成的重要前驱体,在碳烟生成过程中起到关键作用;因此,发展能够同时对碳烟颗粒物及C_(2)H_(2)浓度进行在线测量的方法,对于碳烟生成机理的研究具有重要意义.本文选择中心波长1540 nm的可调谐二极管激光器作为光源,利用多通吸收方式搭建探测系统,在自行设计的气固两相高温静态池中使用C_(2)H_(2)-N_(2)混合气体载带石英砂颗粒模拟颗粒物环境,通过获取6490.02 cm^(-1)处C_(2)H_(2)目标谱线附近的一段消光光谱信号,并从中分别提取出与颗粒物有关的消光信号和与C_(2)H_(2)有关的吸收信号,从而实现了对颗粒物质量浓度和气体体积浓度的同时测量.测量结果表明,在500-1000 K温度范围内颗粒物质量浓度和气体体积浓度的测量值与参考值之间的平均偏差分别为2.73%和5.17%,说明了本技术对于气体与颗粒物同时测量的良好性能.Soot particles from the combustion of hydrocarbon fuels are the main source of the air fine particles and they are also an important factor of reducing the combustion efficiency.As one of their major precursor,acetylene(C_(2)H_(2))plays an important role in forming soot.So the simultaneous detecting of soot particle and C_(2)H_(2)is significant in studying the mechanism of the soot formation.In this work,a sensor for the simultaneous detecting of soot particle and C_(2)H_(2)is developed by using a single DFB diode laser with a wavelength near 1540 nm.The extinction spectrum near the proper C_(2)H_(2)line at 6490.02 cm^(-1) is used to infer the mass concentration of particles and the C_(2)H_(2)concentration.The performance of the sensor is confirmed in a home-made heated static cell which can provide well controlled gaseous environment and particulate environment.The measured mass concentration of particles and the C_(2)H_(2)concentration are within 2.73%and 5.17%of the expected values over the full temperature range of 500-1000 K,respectively.All the measurements show the potential application of the sensor in the simultaneous detecting of soot particle and C_(2)H_(2)at elevated temperature.

关 键 词：可调谐二极管激光吸收光谱 消光光谱 气体浓度 颗粒质量浓度 

分 类 号：O657.3[理学—分析化学] X513[理学—化学] O433.51[环境科学与工程—环境工程]