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

摘要： 摘? 要：硫化氢因其有毒有害的特性，在工业生产过程中对其浓度检测具有重要意义。本文以监测天然气脱硫过程中的硫化氢为应用案例，采用可调谐二极管激光吸收光谱技术（TDLAS）作为分析平台进行浓度分析。TDLAS气体分析系统基于分子选择吸收原理、比尔-朗伯定理和波长调制技术，包括分析模块、气体模块和人机交互模块。在应用案例中，采用1570nm激光器，通过气体模块模拟天然气背景产生0-100ppm硫化氢混合气体，采用化学计量学方法计算硫化氢浓度，结果显示该分析系统满足2%FS的测量需求。因此，具有非接触式、反应迅速、测量精确等优点的TDLAS技术满足现在石化行业的痕量气体测量需求。

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