cetane number


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cetane number

a measure of the quality of a diesel fuel expressed as the percentage of cetane in a mixture of cetane and 1-methylnapthalene of the same quality as the given fuel

Cetane Number

 

an arbitrary quantitative characteristic of the spontaneous combustion of diesel fuels in the cylinder of an engine. As is the case with the octane number of a gasoline, the cetane number of a diesel fuel is determined under strictly controlled conditions; cetane and α-methylnaphthalene, the cetane numbers of which are assumed to be 100 and 0, respectively, are used as the standard references. The ignition quality of a fuel being tested is characterized by determining the composition of a blend of cetane and α-methylnaphthalene that has an equivalent ignition quality. Quantitatively, the cetane number indicates the percentage by volume of cetane in the reference blend. The higher the cetane number of a diesel fuel, the quicker the ignition of the fuel in the engine, the smoother the pressure increase, and the quieter the operation of the engine. The cetane numbers of present-day diesel fuels range from 40 to 55. Additives, such as organic peroxides and nitroalkanes, are used to improve the cetane number.

cetane number

[′sē‚tān ‚nəm·bər]
(chemical engineering)
The percentage by volume of cetane (cetane number 100) in a blend with α-methylnaphthalene (cetane number 0); indicates the ability of a fuel to ignite quickly after being injected into the cylinder of an engine.
References in periodicals archive ?
In addition to increase in production capacity, Syncrode is also pursuing near term and midterm projects to improve product quality by improving the cetane number of diesel fuel, the smoke point of jet fuel, and the quality of HGO as FCC feed.
A high cetane value of biodiesel could compensate for a decrease in the cetane number of the blends caused by the presence of ethanol.
Study of diesel spray combustion and ignition using high-pressure fuel injection and a micro-hole nozzle with a rapid compression machine: improvement of combustion using low cetane number fuel", JSAE Review 19, 1998, pp.
For oil blending, low octane petrol (grade A-76/80) with a cetane number ranging from 20 to 25 and an auto-ignition temperature slightly lower (300[degrees]C) than that of RO would be the most suitable.
The high cetane number and very low levels of sulphur and aromatics ensure a more efficient and cleaner-burning combustion environment.
1998) and Van Gerpen (1996), there are several problems of applying RME to be overcome (unstable cetane number depending on storage time and participating glycerol content).
The cetane number as a measure of auto ignition properties for gasoil from the GTL process ranges from 45-50, which can easily meet current and future requirements of 40-55.
The IQT increases refinery profitability by minimizing the potential for producing higher-than-specified cetane number, sometimes known as "cetane number giveaway," and greatly reduces the cost of testing for fuel blending.
Is so powerful that, when diluted with 250 gallons of diesel, it boosts the Cetane Number, the diesel equivalent to octane number for gasoline, by 12.
3 Reference Documents Above Are As Follows: Distillation Temperature Min And Max For Various Recovery Rates (astm Only At 90% Recovery) Minimum Cetane Number Of 43 (exceeds Astm D 975 Standard Of 40) Maximum Hfrr Wear Scar Diameter (lubricity) Of 460 Microns (exceeds Astm Standard Of 560) Minimum Slbocle Lubricity Value Of
50 Norm ppm S) Cetane number, min 51 Cetane index, min 46 Density at 15[degrees]C, kg/[m.