CO_2高温光谱参数测量系统设计与实验
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摘要
CO_2和CO被称为燃烧效率指示性气体,燃烧流场中CO_2的精确测量对工业燃烧过程的节能减排和发动机燃烧状态诊断等都具有重要意义.研究CO_2气体的高温光谱参数,包括:线强、自加宽系数、温度系数,可提高燃烧过程中CO_2浓度的测量精度和可靠性.为了获得可用于燃烧诊断的CO_2吸收线的高温光谱参数,基于可调谐半导体激光吸收光谱技术设计了一套最高温度可达2 073 K的精确控温控压气体光谱参数测量系统.采用该系统开展了CO_2R(50e)吸收线(中心频率为5 007. 787 cm-1)的高温光谱测量实验,获得了温度范围1212～1873 K内多个压强下的纯CO_2气体的大量高温吸收光谱,经热辐射背景扣除、基线拟合、时频转换、多线组合非线性最小二乘法拟合等数据处理过程,得到温度范围1 212～1 873 K内CO_2R(50e)吸收线的线强、自加宽系数及温度系数,其中线强不确定度<1. 5%,自加宽系数不确定度小于4. 5%.这些参数是对现有数据库的补充和完善,对燃烧诊断中的CO_2浓度检测有很大帮助,能够满足燃烧过程中CO_2浓度精确反演的需求.
CO_2 and CO are called the key indicators of combustion efficiency. Accurate measurement of CO_2 in the combustion flow field is very important for energy conservation and emission reduction in industrial combustion process and engine combustion state diagnosis. Researching intensity,self-broadening full-width,temperature-dependence exponent and other parameters of CO_2 in high temperature,may improve the accuracy and reliability of measurements for CO_2 concentration. A precise temperature control and pressure control gas spectroscopic parameter measurement system with a design temperature up to 2073 K based on absorption spectroscopy has been developed for the measurement of spectroscopic parameters of the R( 50 e) line at 5 007. 787 cm-1 of CO_2. Many high temperature survey spectra of the CO_2 R( 50 e) line were recorded at 1 212 ～ 1 873 K and many pressures through the system.Through background subtraction,baseline fitting,time-frequency conversion,multi-line combination and nonlinear least squares fitting,and other data processing based on the CO_2 R( 50 e) survey spectra,intensity,self-broadening full-width and temperature-dependence exponent at 1 212-1 873 K were obtained.The uncertainty of line strength is less than 1. 5%,the uncertainty of self-broadening full-width is less than 4. 5%. These parameters are supplement and improvement to the existing database. They are helpful for the detection of CO_2 concentration in combustion diagnosis to ensure the accurate inversion of CO_2 concentration in the combustion process.
CO_2 and CO are called the key indicators of combustion efficiency. Accurate measurement of CO_2 in the combustion flow field is very important for energy conservation and emission reduction in industrial combustion process and engine combustion state diagnosis. Researching intensity,self-broadening full-width,temperature-dependence exponent and other parameters of CO_2 in high temperature,may improve the accuracy and reliability of measurements for CO_2 concentration. A precise temperature control and pressure control gas spectroscopic parameter measurement system with a design temperature up to 2073 K based on absorption spectroscopy has been developed for the measurement of spectroscopic parameters of the R( 50 e) line at 5 007. 787 cm-1 of CO_2. Many high temperature survey spectra of the CO_2 R( 50 e) line were recorded at 1 212 ～ 1 873 K and many pressures through the system.Through background subtraction,baseline fitting,time-frequency conversion,multi-line combination and nonlinear least squares fitting,and other data processing based on the CO_2 R( 50 e) survey spectra,intensity,self-broadening full-width and temperature-dependence exponent at 1 212-1 873 K were obtained.The uncertainty of line strength is less than 1. 5%,the uncertainty of self-broadening full-width is less than 4. 5%. These parameters are supplement and improvement to the existing database. They are helpful for the detection of CO_2 concentration in combustion diagnosis to ensure the accurate inversion of CO_2 concentration in the combustion process.
引文
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[18]BEVINGTON P R. Data Reduction and Error Analysis for the Physical Sciences[M]. New York:McGraw-Hill,1969,58-64.
[19]http://hitran. iao. ru/molecule/simlaunch
[2]NANDI S,COLLINS S P,CHAKRABORTY D,et al. Ultra-low parasitic energy for post-combustion CO2capture realized in a nickel isonicotinate MOF with excellent moisture stability[J]. Journal of the American Chemical Society,2017,139(5):1734-1737.
[3]COULIER Y,LOWE A R,COXAM J Y,et al. Thermodynamic modeling and experimental study of CO2dissolution in new absorbents for post-combustion CO2capture processes[J]. ACS Sustainable Chemistry&Engineering,2017,6(1):918-926.
[4]GIRARD J J,SPEARRIN R M,GOLDENSTEIN C S,et al. Compact optical probe for flame temperature and carbon dioxide using interband cascade laser absorption near 4. 2μm[J]. Combustion&Flame,2017,178(1):158-167.
[5]ZHANG Zhi-Rong,XIA Hua,DONG Feng-Zhong,et al.Simultaneous and on-line detection of multiple gas concentration with tunable diode laser absorption spectroscopy[J].Optics and Precision Engineering(张志荣,夏滑,董凤忠,等.利用可调谐半导体激光吸收光谱法同时在线监测多组分气体浓度.光学精密工程),2013,21(11):2771-2777.
[6]LI He-Jie,JEFFRIES J B,HANSON R K. Control of Instabilities in a Swirl-Stabilized Flame with a Tunable Diode Laser Temperature Sensor[J]. Journal of the Combustion Society of Japan,2008,50(154):289-296.
[7]TOTH R A,MILLER C E,DEVI V M,et al. Air-broadened halfwidth and pressure shift coefficients of12C16O2bands:4 750~7 000 cm-1[J]. Journal of Molecular Spectroscopy,2007,246(2):133-157.
[8]TOTH R A,BROWN L R,MILLER C E,et al. Self-broadened widths and shifts of12C16O2:4750~7000 cm-1[J].Journal of Molecular Spectroscopy,2006,239(2),243-271.
[9]TOTH R A,BROWN L R,MILLER C E,et al. Line strengths of12C16O2:4 550~7 000 cm-1[J]. Journal of Molecular Spectroscopy,2006,239(2),221-242.
[10]MA Hong-Liang,SUN Ming-Guo,CAO Zhen-Song,et al.Cryogenic cell for low-temperature spectral experiments of atmospheric molecules[J]. Optics and Precision Engineering(马宏亮,孙明国,曹振松,等.适用于大气分子低温光谱实验的低温吸收池.光学精密工程),2014,22(10):2617-2621.
[11]ROTHMAN L S,GORDON I E,BARBER R J,et al. HITEMP,the high-temperature molecular spectroscopic database[J]. Journal of Quantitative Spectroscopy&Radiative Transfer,2010,111(15):2139-2150.
[12]http://www. cfa. harvard. edu/hitran/
[13]PHILLIPS W J,PLEMMONS D H,GALYEN N A. HITRAN/HITEMP Spectral Databases and Uncertainty Propagation by Means of Monte Carlo Simulation with Application to Tunable Diode Laser Absorption Diagnostics[R].No. AEDC-TR-11-T-2,Office of the deputy undersecretary of defense(science and technology)Washington DC joint technology office on hypersonic,2011.
[14]CHEN Jiu-Ying,LIU Jian-Guo,HE Ya-Bai,et al. Study of CO2spectroscopic parameters at high temperature near2. 0μm[J]. Acta Physica Sinica(陈玖英,刘建国,何亚柏,等. 2. 0μm处CO2高温谱线参数测量研究.物理学报),2013,62(22):212-218.
[15]CHEN Jiu-Ying,LI Chuan-Rong,LIU Jian-Guo,et al.Experimental study on mutual broadening coefficient between CO2and CO and its temperature dependence coefficient under high temperature[C]. SPIE Optical Engineering+Applications. 2016:99740V.
[16]Sun Kai,Chao Xing,Sur R,et al. Analysis of calibrationfree wavelength-scanned wavelength modulation spectroscopy for practical gas sensing using tunable diode lasers[J].Measurement Science&Technology,2013,24(12):5203.
[17]CHEN Jiu-Ying,LIU Jian-Guo,HE Ya-Bai,et al. Temperature measurement of CO2by use of a distributed-feedback diode laser sensor near 2. 0μm[J]. Chinese journal of lasers(陈玖英,刘建国,何亚柏,等.基于分布反馈激光器在2. 0μm波段对CO2气体温度的测量.中国激光),2012,39(11):112-116.
[18]BEVINGTON P R. Data Reduction and Error Analysis for the Physical Sciences[M]. New York:McGraw-Hill,1969,58-64.
[19]http://hitran. iao. ru/molecule/simlaunch