Natural gas and hydrogen-enriched natural gas composition measurements by industrial-grade Raman spectroscopy

Fabio Melison; Lorenzo Cocola; Elena Meneghin; Daniele Rossi; Luca Poletto

doi:10.1117/12.3012835

7 June 2024 Natural gas and hydrogen-enriched natural gas composition measurements by industrial-grade Raman spectroscopy

Fabio Melison, Lorenzo Cocola, Elena Meneghin, Daniele Rossi, Luca Poletto

Author Affiliations +

Proceedings Volume 13026, Next-Generation Spectroscopic Technologies XVI; 130260G (2024) https://doi.org/10.1117/12.3012835
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

The Natural Gas (NG) sector is looking at the Hydrogen-enriched Natural Gas mixtures (H-NG) with growing interest. Hydrogen injections in the NG networks are expected to increase in the next years. Simultaneously, there is the requirement to constantly sample the composition and the thermodynamics properties of combustible blends. Raman spectroscopy is an intrinsic non-invasive approach for gas analysis. In addition, this technique is able to provide multiple-species analysis in a simultaneous way. An industrial-grade instrument, designed to operate directly on-site, has been developed. Its aim is to determine the NG and H-NG blends composition in an accurate and repeatable way, by referring to the OIML R 140 standard. The system is going forward in its industrialization by applying all the engineering steps useful to make it robust and easily replicable. The system laser source is a broadband multi-mode diode centered at 447nm with an optical power of 2W. The scattered radiation is collected by an appositely designed diffraction grating spectrometer and acquired by a 2D uncooled camera. The spectrometer guarantees Raman Stokes acquisition of the entire spectral region of interest without any mechanical movement. Three typical NG and one H-NG certified mixtures has been measured by placing the system in a climatic chamber. The results obtained during this validation show a high accuracy and repeatability in the overall temperature range by requiring only one calibration set carried out at room temperature. The calorific value, calculated by the measured gas mixture concentration, results within ±0.5% error in the full temperature range.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Fabio Melison, Lorenzo Cocola, Elena Meneghin, Daniele Rossi, and Luca Poletto "Natural gas and hydrogen-enriched natural gas composition measurements by industrial-grade Raman spectroscopy", Proc. SPIE 13026, Next-Generation Spectroscopic Technologies XVI, 130260G (7 June 2024); https://doi.org/10.1117/12.3012835

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