基于紫外吸收光谱技术的混合气体SO2和H2S浓度的实时监测

采用紫外波段吸收光谱检测技术,实现了SO₂和H₂S混合气体各组分浓度的实时监测。在实验中选用氘灯为测试光源,MAYA2000Pro光谱仪用于采集数据。基于光谱的峰谷特性,选择吸收光谱上波长非常接近的两个来推导SO₂气体的浓度公式,该方法可以忽略其他气体散射和吸收的影响。H₂S气体的吸收光谱可以通过减去混合气体中相应的SO₂气体吸收光谱获得。在常温常压下,H₂S气体的浓度可以从H₂S气体的吸收光谱的吸收峰获得。混合气体的测量精度约为1×10^-6(1 ppm)。基于上述方法,实现了混合气体SO₂和H₂S浓度的实时监测。

Real-time Monitoring for The Concentrations of SO2 and H2 S Mixed Gas by Ultraviolet Absorption Spectroscopy Detection Technique

By using ultraviolet absorption spectroscopy detection technique, the real-time monitoring for the concentrations of SO₂ and H₂S mixed gas was realized. Deuterium lamp was used as a light source, and MAYA2000Pro spectrometer served as spectrograph in the experiment. Based on Beer-Lambert law and absorption spectrum, the formula of SO₂ concentration was deduced by choosing very close two points in the absorption spectrum, which could ignore the interference of the scattering and absorption from other gas. The absorption spectrum of H₂S gas can be achieved by subtracting the corresponding absorption spectrum of SO₂ gas from mixed gas spectrum. At the normal temperature and pressure, the concentration of H₂S could be obtained from the absorption peak of H₂S absorption spectrum. The measuring accuracy of mixed gas is about 1×10^-6(1 ppm). So, our work realizes the real-time monitoring for SO₂ and H₂S in mixed gas.