Screening analysis of natural gas with respect to methane content by near-infrared spectrometry

Dantas, Hebertty Vieira; Barbosa, Mayara F.; Nascimento, Elaine Cristina Lima do; Moreira, Pablo N.T.; Galvão, Roberto Kawakami Harrop; Araújo, Mário César Ugulino de

doi:10.1016/j.microc.2014.01.003

Cited by 14 publications

(4 citation statements)

References 25 publications

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“…With regards to interference from other molecules, these must be investigated individually. Ethane, appearing in the highest volumetric concentration after methane, as well as the heavier hydrocarbons and nitrogen have been investigated as part of Natural Gas spectroscopy studies (Burns and Ciurczak, 2007;Dantas et al, 2014). It was shown that the spectra of heavier hydrocarbons are weaker and broader than methane and that, in general, 97 % of the absorption variance between varying mixtures of Natural Gas components is solely due to methane.…”

Section: Selection Of Spectroscopic Linesmentioning

confidence: 99%

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Tsekenis

Wilson

Lengden

et al. 2017

Flow Measurement and Instrumentation

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A feasibility study is presented and the achieved key design milestones towards the first application of Chemical Species Tomography by Near-IR Absorption Tomography on a heavy duty, large-bore marine engine to visualise relative mixture strength are described. The engine is equipped with pre-chamber ignition and operates using Liquefied Natural Gas with > 88.9 % methane content. Operation of the engine under maximum-load conditions is a key design requirement, with peak cylinder pressure and mean temperature exceeding 127,510 Torr (170 bar) and 850 K respectively. The near-IR spectroscopic behaviour of methane is examined for suitable absorption and reference regions for the above application. In particular, the spectroscopic absorption around the 2ν3 transition region near 1,666 nm is approximated by simulation using data from the HITRAN database under worst-case conditions. The simulation results are compared with methane spectra experimentally acquired at high temperature and ambient pressure. Interference from other chemical species as well as measurement linearity is also investigated. A 31-laser beam tomographic imaging array is proposed, which has been optimised to achieve higher spatial resolution performance in the vicinity of the pre-chamber’s orifices. To enable optical access, a novel, minimally-intrusive method is presented, utilising standard fibreoptics and collimator

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Section: Selection Of Spectroscopic Linesmentioning

confidence: 99%

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Tsekenis

Wilson

Lengden

et al. 2017

Flow Measurement and Instrumentation

View full text Add to dashboard Cite

show abstract

“…Dantas et al [48] used NIR spectroscopy to measure the methane content of natural gas. The monitoring of methane can be sufficient, when its content is highly dominating the properties of the mixture.…”

Section: Natural Gasmentioning

confidence: 99%

Recent Advances in the Characterization of Gaseous and Liquid Fuels by Vibrational Spectroscopy

Kiefer

2015

Energies

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Most commercial gaseous and liquid fuels are mixtures of multiple chemical compounds. In recent years, these mixtures became even more complicated when the suppliers started to admix biofuels into the petrochemical basic fuels. As the properties of such mixtures can vary with composition, there is a need for reliable analytical technologies in order to ensure stable operation of devices such as internal combustion engines and gas turbines. Vibrational spectroscopic methods have proved their suitability for fuel characterization. Moreover, they have the potential to overcome existing limitations of established technologies, because they are fast and accurate, and they do not require sampling; hence they can be deployed as inline sensors. This article reviews the recent advances of vibrational spectroscopy in terms of infrared absorption (IR) and Raman spectroscopy in the context of fuel characterization. The focus of the paper lies on gaseous and liquid fuels, which are dominant in the transportation sector and in the distributed generation of power. On top of an introduction to the physical principles and review of the literature, the techniques are critically discussed and compared with each other.

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“…2 Nowadays, the fields of application of NIR spectroscopy evidenced by the Brazilian published works are mainly related to chemistry, agriculture, biochemistry, food science, polymers and fuels. [3][4][5][6][7][8][9] As can be seen in Figure 3, there has been a substantial increase in Brazilian scientific output in NIR over the past 20 years, with a clear exponential tendency observed more recently. The most significant number of publications in this area comes from the south-east of the country, from the Chemistry Institute of the State University of Campinas (UNICAMP) in São Paulo state.…”

Section: Makingmentioning

confidence: 99%

Near Infrared Spectroscopy: Highlighting Brazil

Pereira

2014

NIR news

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Screening analysis of natural gas with respect to methane content by near-infrared spectrometry

Cited by 14 publications

References 25 publications

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Recent Advances in the Characterization of Gaseous and Liquid Fuels by Vibrational Spectroscopy

Near Infrared Spectroscopy: Highlighting Brazil

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