Raman spectroscopy applied to the online measurement of natural gas composition

F. Melison; L. Cocola; E. Meneghin; D. Rossi; L. Poletto

doi:10.1117/12.2665516

31 May 2023 Raman spectroscopy applied to the online measurement of natural gas composition

F. Melison, L. Cocola, E. Meneghin, D. Rossi, L. Poletto

Proceedings Volume 12572, Optical Sensors 2023; 125720I (2023) https://doi.org/10.1117/12.2665516
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

The combustible gas sector requires for instrumentation capable to determine the composition and the quality of the gas mixtures present in the transport and distribution networks. The gas parameters need to be monitored in a wide interval, since mixtures are found within an extremely variable range. A compact, fast and highly sensitive instrument based on Raman spectroscopy has been developed with the specific aim to operate directly on-line. This approach is intrinsically non-invasive, since it needs a laser beam passing through the gas, and multi-species sensitive, since the different components of the gas mixture are simultaneously detected. The Raman scattering is stimulated by a laser diode centered at 455 nm with multi-mode emission and 1.5 W optical power. The laser is focused on a gas cell through a window, the Raman emission is collected by a grating spectrometer and finally acquired by a 2D camera. The measured spectra are fitted with the calibration dataset acquired at room temperature to achieve the mixture composition. The system is able to determine the main components of the natural gas: methane, heavier hydrocarbons, nitrogen, carbon dioxide and hydrogen. The Heating Value (HV) is finally calculated using the ISO6976:2016 standard. Several certified gas mixtures have been tested with the instrument operated at different temperatures in the range from -20°C to 50°C, to prove the capability to operate in a wide industrial temperature range. Each measure requires less than 25 seconds, with a sample pressure of 6 bars. The calculated HV value lies in the ±0.5% error range.

Citation Download Citation

F. Melison, L. Cocola, E. Meneghin, D. Rossi, and L. Poletto "Raman spectroscopy applied to the online measurement of natural gas composition", Proc. SPIE 12572, Optical Sensors 2023, 125720I (31 May 2023); https://doi.org/10.1117/12.2665516

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KEYWORDS

Equipment

Raman spectroscopy

Hydrogen

Gas cells

Standards development

Gas sensors

In situ metrology

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