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Showing 1 to 20 of 28 for “"cetane number"”.
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The characterisation and cetane number determination of synthetic diesel fuels
… as the quantity, of the fuel being produced. Cetane number is an important indicator of the quality of a diesel fuel ru1d is measured by a standard engine test (ASTM D 613) which requires l litre of fuel and is therefore not suitable for the routine testing of the small volumes of fuel …
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Effect Of Cetane Number And Volatility On Autoignition And Combustion Of Alternative Fuels And Their Surrogates
… wide range of properties, such as volatility, cetane number, density, viscosity and lower heating value, which influence the behavior of fuel and formation of products. Therefore, it is necessary to understand the effect of these fuel properties on autoignition, combustion, performance, and …
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Nuovi catalizzatori per l'idrogenazione, l'idrogenolisi/ring-opening di composti aromatici policiclici
… that require petroleum reï¬�ners to raise cetane number and to limit aromatics in diesel fuel in order to improve combustion efficiency and reduce particulate and NOx emissions. An alternative is blending with Fischerâ��Tropsch (FT) gas-to-liquid diesel fuel; however, this option may not be …
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Autoignition study of next generation aviation fuels and components
… two heavily branched alkanes; isododecane and isocetane. Due to this irregular composition, the fuel has an extremely low cetane number (~16), and an extensively long ignition delay time at most of the tested conditions. During extended period of ignition delay, multistage ignition phenomena have …
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Modification of an ignition quality tester and its use in characterizing middle distillate fuels
… device which is used to determine the derived cetane number of diesel fuel oils when used in conjunction with ASTM D6890. During a test, the fuel sample is injected into heated, pressurised gas where it combusts. Suitable measurements are made during the combustion event to determine the …
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Oxidative stability and ignition quality of algae derived methyl esters containing varying levels of methyl eicosapentaenoate and methyl docosahexaenoate
… it is known that oxidative stability and cetane number decrease with increasing levels of LC-PUFA. However, these same LC-PUFA fatty acids, such as eicosapentaenoic acid (EPA: C20:5) and docosahexaenoic acid (DHA: C22:6) are known to have high nutritional value thereby making separation of …
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A Fuel Surrogate Approach to Model Combustion Chemistry in Specialty Jet Fuels
… the oxidation and pyrolysis speciation of six cetane number (CN) specialty fuels - CN30, CN35, CN40, CN45, CN50, and CN55, and F-24, a multi-component jet fuel. The experiments were performed at 50 atm nominal pressure, 4.2 ms nominal reaction times over a temperature range of 900–1800 K, and …
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A method for the rapid, accurate prediction of the physical properties of middle distillate fuels from LC-¹H NMR derived data
… (LC-⁻¹H NMR). The physical properties include cetane number, cetane index, density, specific gravity, pour point, flash point, viscosity, filterability, heat of combustion, cloud point, volume percent aromatics, residual carbon content, and initial, 10%, 50%, 90%, and end boiling points. These …
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The catalytic conversion of low chain length hydrocarbons to liquid fuels using ion exchange resin
… the -180°C fraction is approximately 97 and the cetane number of the +180°C fraction approximately 35.
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The hydrocracking of Fischer-Tropsch wax : using n-tetradecane as a model compound
… good quality diesel, the fuel should have a high cetane number and the aromatics and sulphur content should also be kept to a. minimum (e.g. EU legislation: sulphur content must be below 10 ppm (wt) by 2008). Fischer-Tropsch wax is made up predominantly of long-chain linear paraffins with …
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Selection of Prediction Methods for Thermophysical Properties for Process Modeling and Product Design of Biodiesel Manufacturing
… three biodiesel properties, namely, viscosity, cetane number, and flash point. Also, to ensure the operability of biodiesel in cold weather, one needs to quantitatively predict three low-temperature flow properties: cloud point (CP), pour point (PP), and cold filter plugging point (CFPP). This …
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The Effect Of Biodiesel Blends On A Multi-Cylinder Engine And The Impact On Aftertreatment
… evaluating and recording parameters such as cetane number, oxidative stability, and lubricity made from different feedstocks to be used for engine testing. The evaluations of these selected fuels are then blended with ULSD and tested in single and multi-cylinder engines. The proceeding work …
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The oligomerization of propene over nickel synthetic mica-montmorillonite
… 94.5 and the hydrogenated diesel fraction has a cetane number less than 35.
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Effects of oxygenated fuels on DI diesel combustion and emissions
… properties that impact emission levels; such as cetane number, density, aromatic content, and volatility. Mechanisms responsible for changes in the combustion process and emissions were investigated with a matrix containing 14 fuels, addressing oxygenate proportionality, structure, volatility, …
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Effect of market fuel variation and cetane improvers on CAI combustion in a GDI engine
… impact of market fuel composition variation and cetane improver additives on CAI combustion in a gasoline direct injection (GDI) engine. The test fuels were blends of different commercial refinery products, containing hundreds of hydrocarbon species. The blends were selected to vary Research …
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Performance and emission characteristics of a gas-diesel engine
… to total-fuel energy ratio and pilot-diesel cetane number. These parameters were found to have very strong effects on thermal efficiency and exhaust emissions (ie. NOx, THC, CH₄, CO, CO₂ and BOSCH smoke index). The thermal efficiency and exhaust emissions were determined as a function of load …
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Shock Ignition of N-Heptane With Supplemental Hydrogen
… soot, it will have a negative impact on the cetane number. However, the impact is expected to be very small as 20% hydrogen addition on average only increases the ignition delay time by 8%. For temperatures above 1000 K, the fast decomposition of hydrogen provides free radicals that speed up …
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GHG Implications of Downstream Decisions in the Petroleum Industry: A Life Cycle Assessment
… refinery configuration. However, variability in cetane number is the one exception which contributes largely to refining GHG emissions when comparing across the extremes of cetane standards that currently exist in the U.S. The outcome of this research provides insights into the magnitude and …
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Pathways for Low Emissions Utilizing Spray Targeted Reactivity Stratification (STARS) in High Efficiency Natural Gas Dual Fuel Combustion
… low reactivity fuel (LRF). The HRF has a higher cetane number than the LRF, which allows for easier auto-ignition in compression ignition engines. Dual fuel engines also utilize high air to fuel ratios to achieve LTC. This, combined with early injection timings of the HRF, helps to reduce oxides …
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Investigation of Emission Characteristics during Low Temperature Combustion using Multivariate Adaptive Regression Splines
… based on the variation of three properties: cetane number, aromatic content, and 90 percent distillation temperature. The experimental data was used has a platform for the code development, and for its validation.;Using multivariate data analysis is not only useful in visualizing correlations …
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