基于Herriott吸收池的固定源二氧化碳浓度测量

Carbon Dioxide Concentration Measurement of Fixed SourceBased on Herriott Absorption Cell

准确的碳排放计量是实现“碳峰化、碳中和”目标的重要一步。在所有碳排放源中,固定排放源排放的CO_(2)是温室效应的主要因素。因此,精确测量固定排放源CO_(2)的浓度尤为重要。基于近红外分子吸收光谱原理并结合多次反射直接吸收光谱技术,利用35%CO_(2)/N_(2)混合物,建立了精确测量CO_(2)浓度的方法,测量了293 K和0,4.1,8.1,13.3 kPa下,CO_(2)在6359.97 cm^(-1)的(30012)←(00001)R16e和6361.25 cm^(-1)的(30012)←(00001)R18e跃迁谱线,计算了R18e的谱线强度,通过比较35%CO_(2)/N_(2)混合物和其它CO_(2)/N_(2)混合物的吸收面积,可以得到15%,10%,5%的CO_(2)/N_(2)混合物的浓度。结果表明所建立的理论方法和实验结果能够较好地表征待测气体的浓度,测量不确定度与基于天平的称重法相当。

Accurate carbon emission measurement is an important step to achieve the goal of"carbon peak and carbon neutral".Among all sources of emissions,the emission of carbon dioxide from point sources is a major factor in the greenhouse effect.Therefore,it is important to accurately measure the concentration of carbon dioxide from point sources.Based on the principle of near-infrared molecular absorption spectroscopy combined with multiple reflection direct absorption spectroscopy,an accurate method was established for the measurement of CO_(2) concentration using 35%CO_(2)/N_(2) mixture.CO_(2) transitions from(30012)←(00001)R16e of 6359.97 cm^(-1) to(30012)←(00001)R18e of 6361.25 cm^(-1),the spectral line intensity of R18e was calculated.By comparing the absorption areas of 35%CO_(2)/N_(2) mixtures with other CO_(2)/N_(2) mixtures,concentrations of 15%,10%,and 5%CO_(2)/N_(2) mixtures can be obtained.The results show that the theoretical method and experimental results can well characterize the concentration of the gas to be measured,and the uncertainty of measurement is comparable to that of the weighing method based on balance.