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研究了差分吸收光谱技术在工业污染源烟气排放监测中的应用及实现.借助于独立的采样和前处理系统去除烟尘和水汽对光谱拟合的影响.为避免高浓度的SO2在常温下发生光解,将经前处理后的烟气加热至150℃进行测量.采用Voigt线型对SO2,NO,NO2在185—235nm波段的吸收截面进行了展宽,获得了高温气体的标准吸收截面,并与归一化的光谱仪仪器函数进行卷积得到了光谱拟合所需的有效吸收截面.将反演结果与非分散红外分析仪的测量结果进行了实时对比,获得了较好的一致性,验证了差分吸收光谱方法高准确度测量工业污染源烟气排放的可行性.
The application and realization of differential absorption spectroscopy in the monitoring of smoke emission from industrial sources was studied.The effects of soot and water vapor on the spectral fitting were removed by means of an independent sampling and pretreatment system.In order to avoid the high concentration of SO2 from occurring at room temperature Solution, the pre-treated flue gas was heated to 150 ℃ for measurement.Using the Voigt linear model, the absorption cross section of SO2, NO and NO2 in the band 185-235nm was broadened, and the standard absorption cross section of high temperature gas was obtained. The normalized spectral instrument functions were convoluted to obtain the effective absorption cross section needed for spectral fitting.The real-time comparison between the inversion results and the measurement results of non-dispersive infrared analyzer showed good agreement and verified DIFFERENTIAL ABSORPTION SPECTROPHOTOMETRY: HIGHER ACCURATE MEASUREMENT OF FIRE EMISSIONS FROM INDUSTRIAL SOURCES.