基于FTIR和UV-DOAS联用技术的烟气在线监测系统的应用研究

Research on the Application of On-line Monitoring System for Flue Gas Emission Based on the Combination of FTIR and UV-DOAS

文章介绍了基于傅里叶变换红外光谱(FTIR)和紫外差分吸收光谱(UV-DOAS)联用技术的烟气在线监测系统。实验证明UV-DOAS技术在检测过程中不会受到H2O的干扰影响,可用来精确计算NO、NO2和SO2的浓度,FTIR技术可根据偏最小二乘法(PLS)计算得到CH4、HCl、HF、CO、CO2等其他烟气污染物的浓度,两种监测技术并行,可自由切换。经过长时间测量,各组分气体零点漂移均小于2%F.S,说明系统具有良好的稳定性,能够实现对高温高湿现场烟气污染物的精确测量。

This paper introduced the on-line monitoring system for flue gas emission based on the combination of Fourier transform infrared spectroscopy(FTIR) and the ultraviolet differential optical absorption spectroscopy(UV-DOAS). Experimental results showed that the UV-DOAS technology remained unaffected by H2O interference during the detection process. So the UV-DOAS technology can be used to accurately calculate the concentrations of NO, NO2 and SO2. The concentrations of CH4, HCl, HF, CO, CO2 and other flue gas pollutants can be calculated according to the partial least square(PLS) method by using the FTIR technology. The two monitoring technologies are parallel and can be switched freely. After a long-term measurement, the zero drift of each component gas is less than 2%F.S, indicating that the system has good stability and can achieve accurate measurement of high-temperature and high-humidity on-site flue gas pollutants.