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An Experimental Study of the Effects of n-/iso-Butanes and Pentanes on the Methane Number of Natural Gas Mixtures Technische Universität Braunschweig
- Format:
- Book
- Conference/Event
- Author/Creator:
- Kühne, Ulf, author.
- Conference Name:
- SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- Liquefied natural gas (LNG) plays an increasingly important role as a climate-friendly fuel for a sustainable mobility. Compared to diesel, LNG has a CO2 reduction potential of around 20%. There is also the possibility of reducing GHG by adding biogas or synthetic natural gas. The Methane Number (MN) characterizes the knocking properties of gaseous fuels and was defined by AVL. There is no standardized measurement procedure for the MN. Instead, there are some algorithms to calculate the MN from the gas mixture composition. Most of them are based on the original AVL measurement data, e.g. the NPL algorithm. In the AVL study, the different knocking properties of n- and iso-components of the alkanes were not investigated. This paper focuses on the experimental investigation of the knock resistance of different alkanes in LNG mixtures and the improvement of the NPL algorithm based on these results. This algorithm does not distinguish between the different isomers, because there were no experimental data available for the development. A single cylinder heavy-duty engine is used for the tests. As this is not the original test engine used by AVL only the Service Methane Number can be measured. It is determined by measuring the knock-limited spark advance of a gas mixture and subsequently comparing with a set of reference gases with defined MN. The experimental results clearly show a higher knock-resistance for the iso-alkanes, while the n-alkanes are less knock-resistant than calculated. The NPL-algorithm is extended accordingly. This extension can be used for all AVL-based algorithms
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-01-0524
- Access Restriction:
- Restricted for use by site license
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