【摘要】 为减少环境污染,我国已经针对污染气体实施新的超低排放控制法规,要求燃煤电厂SO₂、NO、NO₂排放浓度分别低于30×10–⁶,75×10–6,55×10–⁶。为解决监测低浓度SO₂和NO的混合气体时,传统差分光学密度法（differential optical absorption spectroscopy,DOAS）对NO和SO2的检测不能满足新要求的问题,该文使用SO2的另一个吸收谱段,信噪比相比之前（290³20 nm）提高10倍,而且不受NO的影响,可以精确计算SO₂的浓度。采用新的混合光谱分离方法,实现传统DOAS不能实现的功能。该方法对SO₂的检测限为0.1×10–6/m,NO浓度在（0⁵）×10–6时,相对误差绝对值低于5%,浓度在（6⁶0）×10–6之间,相对误差绝对值低于2%。SO2浓度在（0⁴）×10–6时,相对误差绝对值低于5%,SO₂浓度在（4²7）×10–6时,相对误差绝对值低于2%,实验结果表明:该方法能检测低浓度下NO和SO₂的混合气体,检测限和误差均优于传统DOAS处理方法。更多还原

【Abstract】 In order to reduce the pollution of the environment,Chinese government has implemented a new ultra-low emission control regulations for polluting gas,requiring new coal-fired power plant emissions SO2less than 30×10–6,NO less than 75×10–6,NO2 less than 55×10–6,Monitoring low concentration of NO and SO2mixed gases,traditional differential optical absorption spectroscopy(DOAS)technology facing new challenges,it can not meet the new requirements.In order to solve this problem,another absorption bands of SO2 is adopted,SNR is ten times higher than it at 290-320 nm,and not affected by the NO,the concentration of SO2can be accurately calculated.The new hybrid spectral separation method is adopted to achieve the function that traditional DOAS can not achieve.Detection limit of this method is 0.1×10–6/m.The relative error absolute value below 5%when the concentration of NO between(0-5)×10–6,and the relative error absolute value below2%when the concentration between(6-60)×10–6.The relative error absolute value below 5%when the concentration of SO2 between(0-4)×10–~6,and the relative error absolute value below 2%when the concentration between(4-27)×10–~6.The experiment shows this method can meet the requirements of the new regulations,detection and error are both better than the traditional method.更多还原