Construction of CS2 Combustion Flame Spectral Radiation Model and Inversion of Characteristic Pollution Product Concentration
PENG Wu-di1, NING Jia-lian2, CHEN Zhi-li1*, TANG Jin1, LIU Li-xi1, CHEN Lin1
1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China
2. South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510000, China
Abstract：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.
Key words：CS2 flame; Flame spectrum; Spectral radiation model; Quantitative inversion of gas concentration
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