激光拉曼光谱法天然气原料气中CO<sub>2</sub>和H<sub>2</sub>S在线分析研究及应用

doi:10.3964/j.issn.1000-0593(2023)11-3551-08

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Abstract To address the lack of online analysis for CO₂ and H₂S in the purification of raw natural gas, a cutting-edge laser Raman analyzer and accompanying pre-treatment device have been developed. These advancements aim to tackle the highly corrosive properties of raw natural gas, including water content, oil pollution, particulate matter impurities, high sulfur content, and carbon dioxide. Additionally, a pioneering online analysis method utilizing laser Raman spectroscopy was established. The accuracy and repeatability of carbon dioxide and hydrogen sulfide measurements were thoroughly investigated, confirming the reliability of the online analysis methods. Calibration on these methods was also studied. On-site application experiments were conducted in natural gas purification plants to assess the effectiveness of the developed technology. The method performance testing experiment, demonstrated a deviation of less than 1.0% between the laser Raman test results of hydrogen sulfide and the standard gas indication value, with a relative standard deviation of less than 0.6% across seven measurement results. Similarly, the relative deviation between Raman test results of carbon dioxide and the standard gas indication value was less than 1.0%, with a relative standard deviation of less than 0.76% across seven measurement results. In the application experiments, the relative deviation between on-line Raman spectroscopy and offline iodimetry for H₂S test results ranged from 0.3% to 7.5% (with over 90% of the data falling below 3%). In comparison, the relative deviation between on-line Raman spectroscopy and offline gas chromatography for CO₂ test results ranged from 0.6% to 8.4% (with over 80% of the data falling below 3%). The calibration cycle was set at 3 days. The online Raman spectrometer operated smoothly and consistently, enabling real-time monitoring of composition dynamics, thus satisfying the on-line analysis needs of natural gas purification plants.

Key words：Raman spectroscopy; Natural gas; Online analysis; Hydrogen sulfide; Carbon dioxide

Received: 2023-02-13 Accepted: 2023-08-10

ZTFLH:

TE132.1

Cite this article:

ZHU Hua-dong,ZHANG Si-qi,TANG Chun-jie. Research and Application of On-Line Analysis of CO₂ and H₂S in Natural Gas Feed Gas by Laser Raman Spectroscopy[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3551-3558.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2023)11-3551-08 OR https://www.gpxygpfx.com/EN/Y2023/V43/I11/3551

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