On-line gas Raman analysis method for natural gas components

Abstract

The invention discloses an on-line gas Raman analysis method for natural gas components based on the Raman spectrum superposition principle.The method comprises the following steps that a basic sample of pure methane or pure nitrogen or the like is prepared, and a modeling sample formed by pairwise mixing the basic sample and other gas according to a certain proportion is prepared; a Raman spectrum of the basic sample and a Raman spectrum of the modeling sample are measured, and a spectrum database containing various pure substance spectrums and parameters of the pure substance spectrums is established based on the double-component gas modeling sample with known composition; for natural gas with known composition, a Raman spectrum of the natural gas is measured firstly, spectrum pretreatment is carried out, and the established database and a least square method are utilized for obtaining the molar percentage of all the components.The method has the advantages that detection speed is high, accuracy is high, repeatability is good, contact with sample gas is avoided, maintenance on site is avoided, and on-line real-time detection of the natural gas can be achieved.By the adoption of the method, operation is easy and convenient, no damage is caused to the samples in the detection process, and cleanliness and environment friendliness are achieved.

Description

technical field [0001] The invention belongs to the field of chemometrics and relates to a spectral detection method for the composition and content of a gas mixture, in particular to an on-line detection method for the content of each component of natural gas. Background technique [0002] my country is not only a big energy consumer, but also a big energy producer. Coal occupies the main position in my country's energy structure at present, but the utilization of coal will cause serious pollution to the environment. Therefore, the development of new energy sources is imminent. [0003] As a clean and easy-to-use energy source, natural gas has considerable reserves in my country. The application of natural gas power generation has the advantages of low emission and low pollution, so it has attracted the attention of governments of various countries, and it is also an important direction for my country's future energy development. In gaseous fuel power generation, real-ti...

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Problems solved by technology

However, due to the long analysis period of online gas chromatography, the heavy workload of on-site maintenance and the complicated measurement process, its wide application is limited.

[0006] Infrared spectroscopy is widely used, but because it cannot detect homonuclear diatomic molecules, such as nitrogen and hydrogen, and water has strong absorption interference on it, it cannot meet the online real-time detection requirements for natural gas and other mixed gases

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