Cetane Number Of Diesel Fuels Research Articles

The role of additives as sensitizers for the spontaneous ignition of hydrocarbons

The response, following rapid compression, of the spontaneous ignition of normal butane to the effect of small additions of isopropyl nitrate and di-t-butyl peroxide was studied. Comparisons were also made with the effects of ethanal and of diethyl ether, which are amongst the most readily oxidisable organic compounds. Compositions of up to 5% of the additive in the fuel were studied, which was itself in stoichiometric proportions in “air”. Supplementary studies were made of the combustion of each of these compounds in the absence of butane, and of other selected compositions in which the “additive” components were more prominent. The results relate to the improvement of cetane numbers of Diesel fuels in response to the inclusion of organic peroxides or nitrates as additives. Ignition delays in gases compressed beyond 750 K became extremely short when the peroxide or nitrate were present at less than 5% of the butane, but the oxygenated organic compounds had hardly any effect on the ignition delay when present in such small amounts, despite their far greater reactivity than normal butane. The distinction in behaviour arose because the thermally unstable compounds were able to undergo oxidative decomposition readily and release heat during the final stages of compression. This led to thermal criticality. By contrast, ethanal and diethyl ether were able only to oxidise via a degenerate chain branching reaction, which did not develop sufficiently rapidly for ignition to take place on a sub-millisecond timescale, and was not enhanced very merkedly by the interaction with normal butane. It appears that the choice of a Diesel fuel additive should be guided by the ability of the additive to maximise the initial reaction rate and overall exothermicity through a kinetic interaction between it and the primary fuel. The type of interation that takes place may be controlled by the numbers of free radicals and the nature of primary products from the additive decomposition or oxidation.

Prediction of cetane number of diesel fuels from carbon type structural composition determined by proton NMR spectroscopy

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of cetane number of diesel fuels from carbon type structural composition determined by proton NMR spectroscopyOmer L. Gulder and Boris GlavincevskiCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 2, 153–156Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 June 1986https://doi.org/10.1021/i300022a005RIGHTS & PERMISSIONSArticle Views299Altmetric-Citations27LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (490 KB) Get e-Alerts

Laboratory method for determining diesel fuel cetane number without engine test

Laboratory method for determining diesel fuel cetane number without engine test

Influence of diesel fuel cetane number on operating indices of engine

1. An increase in the cetane number of winter and arctic diesel fuels from 40 (GOST 4749-49) to 45 (GOST 4749-73) leads to a decrease in the dynamic stress of the operating cycle in automotive/tractor engines amounting to at least 30%, so that the time between overhauls can be increased. 2. The use of high-cetane fuels (50 and up) brings about a progressive increase in specific fuel comsumption and in exhaust smoke.

Monomeric and polymeric peroxides as additives to diesel fuel

1. It has been shown that the combustion process is intensified in the presence of peroxidic additives; this is reflected favorably in the completeness and rapidity of fuel combustion. 2. It has been established that in the presence of peroxides the cetane numbers of diesel fuels are increased, on the average, by 25–457%.

Effect of supercharging on ignition quality of diesel fuels

1. Supercharging to Pabs = 1.5 kg/cm2 in the IT9-3 single-cylinder diesel unit does not change the method for rating diesel fuel ignition quality as expressed in cetane units, using the standard method of “fixed ignition delay” (GOST 3132-52). 2. Conversion scales from secondary to primary reference fuels with or without supercharge are identical. The error in the use of these scales to determine cetane numbers of diesel fuels of differing hydrocarbon composition and source is insignificant, i.e., is within the precision limits of the method. 3. A relationship has been established between the compression ratio for “fixed ignition delay” (FID) and the ignition delay period (IDP) for fuels with cetane numbers from 20 to 60; this relationship can be used to determine the effect of supercharge on the FID compression ratio, the ignition delay period (IDP), and the ignition quality of the fuel expressed in cetane units.