Multi-pass cavity-enhanced Raman spectroscopy of complex natural gas components

IF 5.7 2区化学 Q1 CHEMISTRY, ANALYTICAL

Analytica Chimica Acta Pub Date : 2024-11-22 DOI:10.1016/j.aca.2024.343463

Miaolin Wang , Jianxin Wang , Pinyi Wang , Ziyi Wang , Sirui Tang , Guochao Qian , Tanglong Liu , Weigen Chen

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引用次数: 0

Abstract

Background

The concentration of natural gas components significantly impacts the transportation, storage, and utilization of natural gas. Consequently, implementing online monitoring and leak detection systems is vital to guarantee the efficient use of natural gas and to uphold its safe and stable operation. Raman spectroscopy offers distinctive benefits, including high selectivity, superior precision, and the capability to detect multiple gas components simultaneously using a single-wavelength laser. Nevertheless, the inherent weakness of the Raman effect in gases results in limited detection sensitivity for Raman spectroscopy, which may not suffice for specific practical applications.

Results

This paper presents a study investigating the detection of natural gas's complex components using a high-sensitivity multi-cavity enhanced Raman spectroscopy technique. An enhanced folded Z-shaped multi-pass cavity has been constructed to amplify the interaction length between the laser and the gas, thereby significantly boosting the Raman signal intensity by 1000 times. The detection limits for CH₄, C₂H₆, C₃H₈, n-C₄H₁₀, i-C₄H₁₀, n-C₅H₁₂, i-C₅H₁₂, and n-C₆H₁₄ gases reached 0.12, 0.53, 0.55, 0.67, 0.28, 0.46, 0.34, and 0.71 ppm, respectively. The least squares method was utilized to establish quantitative relationships between the characteristic peak heights and the concentrations of gases, encompassing both single-component and mixed multi-component systems. Additionally, the natural gas samples were configured and subsequently detected and analyzed.

Significance

As proposed in this paper, the results indicate that the MPC-CERS system boasts several advantages, including a low detection limit, high quantitative accuracy, excellent detection repeatability, and robust system stability. Furthermore, its capability for real-time monitoring is well-suited to meet the gas detection requirements in practical applications. Consequently, the research presented in this paper offers innovative insights for the online tracking and leak detection of distributed energy natural gas systems.

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复杂天然气成分的多通腔增强拉曼光谱分析

背景天然气成分的浓度对天然气的运输、储存和使用有重大影响。因此，实施在线监测和泄漏检测系统对于保证天然气的高效利用和安全稳定运行至关重要。拉曼光谱具有独特的优势，包括高选择性、高精度以及使用单波长激光同时检测多种气体成分的能力。然而，由于气体中拉曼效应的固有弱点，拉曼光谱的检测灵敏度有限，可能无法满足具体的实际应用。我们构建了一个增强型折叠 Z 形多通腔，以放大激光与气体之间的相互作用长度，从而将拉曼信号强度显著提高 1000 倍。CH4、C2H6、C3H8、n-C4H10、i-C4H10、n-C5H12、i-C5H12 和 n-C6H14 气体的检测限分别达到 0.12、0.53、0.55、0.67、0.28、0.46、0.34 和 0.71 ppm。利用最小二乘法建立了特征峰高与气体浓度之间的定量关系，包括单组分和多组分混合体系。意义如本文所述，研究结果表明，MPC-CERS 系统具有多种优势，包括检测限低、定量准确度高、检测重复性好以及系统稳定性强。此外，其实时监测能力也能很好地满足实际应用中的气体检测要求。因此，本文介绍的研究为分布式能源天然气系统的在线跟踪和泄漏检测提供了创新见解。

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来源期刊

Analytica Chimica Acta 化学-分析化学

CiteScore

10.40

自引率

6.50%

发文量

1081

审稿时长

38 days

期刊介绍： Analytica Chimica Acta has an open access mirror journal Analytica Chimica Acta: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Analytica Chimica Acta provides a forum for the rapid publication of original research, and critical, comprehensive reviews dealing with all aspects of fundamental and applied modern analytical chemistry. The journal welcomes the submission of research papers which report studies concerning the development of new and significant analytical methodologies. In determining the suitability of submitted articles for publication, particular scrutiny will be placed on the degree of novelty and impact of the research and the extent to which it adds to the existing body of knowledge in analytical chemistry.