关键词: 硫化氢 天然气 调制吸收光谱技术 比尔-朗伯定律 化学计量学

Abstract: Abstract：Hydrogen sulfide is toxic and harmful. It is of great significance to detect the concentration of hydrogen sulfide in industrial production. In this paper, we took the online measurement of hydrogen sulfide in natural gas desulfurization process as the application example. The analysis system based on tunable diode laser absorption spectroscopy (TDLAS) technology was used for concentration measurement. TDLAS gas analysis system based on molecular selective absorption principle, Beer-Lambert law and wavelength modulation technology, includes analysis module, gas module and human-computer interaction module.In the application case, 1570nm laser wavelength is chosen to analyze hydrogen sulfide in natural gas as the example. In the experiment, gas mixtures of 0-100 ppm hydrogen sulfide are produced in typical natural gas streams through gas module. The hydrogen sulfide concentration is calculated by chemometrics method. The results show that the analysis system meets the measurement requirements of 2% FS. It demonstrates that TDLAS technology, which has the advantages of non-contact, rapid reaction and accurate measurement, meet the needs of trace gas measurement in petrochemical industry.

Key words: hydrogen sulfide natural gas tunable diode laser absorption spectroscopy(TDLAS) Beer-Lambert law chemometrics method