Citation: GAO Ying, DAI Lian-Kui, ZHU Hua-Dong, CHEN Yun-Liang, ZHOU Li. Quantitative Analysis of Main Components of Natural Gas Based on Raman Spectroscopy[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(1): 67-76. doi: 10.19756/j.issn.0253-3820.181401 shu

Quantitative Analysis of Main Components of Natural Gas Based on Raman Spectroscopy

1.
College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China;
2.
Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu 610213, China

Received Date: 17 June 2018
Revised Date: 8 November 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No. U1609213).

After desulfurization and dehydration treatment, natural gas is composed of methane, ethane, propane, carbon dioxide, nitrogen, hydrogen, carbon monoxide and unknown alkane components of C₄ or more (denoted as C₄⁺). The sum of the content of first seven components is more than 90% of natural gas. When the existing Raman spectral analysis methods are applied to analyze the natural gas composition, a small amount of unknown alkane components C₄⁺ will have a greater impact on the analysis precision. On the basis of this, a novel Raman analysis method which consists of a spectral automatic decomposition algorithm and a quantitative analysis model has been developed. Based on a linear additivity of Raman spectra, the Raman spectrum of a natural gas sample can be decomposed into the sum of the Raman spectra of pure constituents and several Lorentz peaks by a nonlinear least-square optimization algorithm. The content of the unknown alkane component C₄⁺ can be described as the area of C-H deformation vibration peak common for most alkane molecules. Samples of the training set are used to establish the model between Raman characteristic peak area and corresponding concentration for each component relative to methane. Compared with the existing Raman analysis methods, the new method solves the issue of analyzing natural gas containing unknown alkane components and has good stability and accuracy. Experiments show that the maximum absolute errors of this algorithm for methane, ethane, propane, carbon dioxide, nitrogen, hydrogen, and carbon monoxide respectively reach 0.57%, 0.37%, 0.21%, 0.07%, 0.18%, 0.04%, 0.13%, and the correlation coefficient of gas chromatographic results also reaches 0.997, 0.986, 0.991, 0.998, 0.993, 1.000, 0.995, 0.982, respectively.
- Natural gas,
- Raman spectroscopy,
- Lorentz peak,
- Nonlinear least square,
- Spectral decomposition
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沈阳化工大学材料科学与工程学院沈阳 110142