CS2燃烧火焰光谱辐射模型的构建与特征污染产物浓度反演研究

CS₂在当今化工等领域占据了重要地位，而CS₂火灾污染事故危害性极大。通过研究CS₂燃烧火焰光谱辐射以探究其火灾污染特性极为必要。搭建了CS₂燃烧火焰光谱测试平台，采用黑体辐射源对VSR仪器进行了标定，通过多用途傅里叶变换(VSR)红外光谱辐射仪测试了5，10和20 cm三种燃烧尺度下CS₂燃烧的火焰光谱，并通过热电偶测试了整个燃烧时间段内不同燃烧时刻下的火焰温度，以及在火焰上方安装了烟气分析仪对火焰中的燃烧产物浓度进行监测。测量了CS₂整个燃烧时间段内火焰温度，以及不同燃烧时间、不同燃烧尺度下的火焰光谱、燃烧产物组分信息。测试结果表明，CS₂火焰中主要含有高温SO₂，CO₂，CO气体和空气中卷入的H₂O分子，并获取了特征污染产物SO₂的浓度。由于现有光谱仪测量分辨率有限，室内实验测量的火焰尺度有限，为了能实现火灾在线监测需要建立一个火焰光谱辐射模型来反演CS₂火灾时的污染物浓度相关信息。基于HITRAN数据库可知在2.7 μm附近为高温水蒸气的发射峰，4.2 μm附近特征峰为高温CO₂气体的发射峰，4.7 μm附近有CO微弱的发射峰，在7.4 μm附近特征峰为高温SO₂气体的发射峰，并获得了CS₂燃烧时产生的SO₂，CO₂，CO和H₂O气体在火焰燃烧相同温度下的吸收系数，通过计算得到了CS₂燃烧时产生的SO₂，CO₂，CO和H₂O混合气体的透过率与发射率，并结合气体辐射传输方程、气体吸收系数等方程，创建了CS₂燃烧的火焰光谱辐射模型。利用该光谱辐射模型反演了不同燃烧时间下特征污染产物SO₂的浓度，并与实验测得的数据进行了对比分析。结果表明，该模型精度高，可用于燃烧产物浓度的定量化反演，SO₂分子含量在燃烧时间20，40，60和80 s时的反演精度分别是89.5%，82.5%，85.6%和86.5%。为遥感反演CS₂型大尺度火灾中燃烧产物的浓度奠定基础。

Construction of CS2 Combustion Flame Spectral Radiation Model and Inversion of Characteristic Pollution Product Concentration

CS₂ plays an important role in today’s chemical industry and other fields, while CS₂ fire pollution accidents are extremely harmful. It is necessary to study the fire pollution characteristics of CS₂ by studying the spectral radiation of CS₂ combustion flame. Has set up a platform CS₂ combustion flame spectrum test, this paper adopts from a complete set of VSR instrument calibration blackbody radiation sources, through infrared spectrum radiometer VSR test 5 cm, to 10 cm, 20 cm three scales CS₂ combustion flame spectrum, and through the thermocouple tested the whole combustion flame temperature under different combustion period, and installed over the flame to monitor the quality of flame in the combustion product concentration of flue gas analyzer. The flame temperature during the whole combustion period of CS₂, the flame spectrum and the composition information of combustion products at different combustion times and scales were measured. The test results show that the CS₂ flame mainly contains high temperature gases such as SO₂, CO₂, CO and H₂O, and the concentration of characteristic pollution product SO₂ is obtained. Due to the limited measurement resolution of existing spectrometers and the limited flame scale measured in laboratory experiments, to achieve online fire monitoring, it is necessary to establish a flame spectral radiation model to retrieve the pollutant concentration-related information in CS₂ fire. Based on the HITRAN database is near 2.7 μm for high temperature and water vapor emission peak, 4.2 μm for CO₂ emission peak, around 4.7 μm is CO faint emission peak, near 7.4 μm for SO₂ emission peak. We have gained CS₂, SO₂, CO₂, CO and H₂O gas in the absorption coefficient of the same temperature and calculate mixed gas transmittance and the emissivity, Combined with the gas radiation transfer equation and gas absorption coefficient equation, the flame spectral radiation model of CS₂ combustion is established. The spectral radiation model was used to invert the characteristic pollutant SO₂ under different combustion times and compared with the experimental data. The results show that this model has high accuracy and can to invert the concentration of combustion products quantitatively. The accuracy of inversion of SO₂ concentration at the time of 20, 40, 60 and 80 s is 89.5%, 82.5%, 85.6% and 86.5%, respectively. It lays a foundation for remote sensing monitoring and inversion of the concentration of combustion products in CS₂ large-scale fire.