Spelling suggestions: "subject:"dimethyl other (DME)""
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A comparative study of the combustion characteristics of a compression ignition engine fuelled on diesel and dimethyl etherLopes, Paulo Miguel Pereira 28 February 2007 (has links)
Student Number : 9707408V -
MSc(Eng) research report -
School of Mechanical, Industrial and Aeronautical Engineering -
Faculty of Engineering and the Built Environment / This research is an investigation into the performance and combustion characteristics of
a two-cylinder, four-stroke compression ignition engine fuelled on diesel and then on
dimethyl ether (DME). Baseline tests were performed using diesel. The tests were then
repeated for dimethyl ether fuelling. All DME tests were performed at an injection
opening pressure of 210 bar, as recommended for diesel fuelling. The tests were all
carried out at constant torque with incremental increases in speed and an improved
method of measuring the DME flow rate was devised. It was found that the engine’s
performance characteristics were very similar, regardless of whether the engine was
fuelled on diesel or DME. Brake power, indicated power and cylinder pressure, during
the highest loading condition of 55 Nm, were virtually identical for diesel and DME
fuelling, with the most significant finding being that the engine was more efficient when
fuelled on DME than when fuelled with diesel. Another interesting finding was that the
energy release of diesel decreases with increasing load, whilst the energy release of
DME increases with increasing load. At the highest loading condition of 55 Nm, the
energy release of DME was approximately 210 joules higher than that of diesel. This
investigation concluded that DME may definitely be a suitable substitute fuel for diesel.
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DEVELOPMENT OF DIMETHYL ETHER (DME) AND CARBON DIOXIDE SENSORS USING PLATINUM NANOPARTICLES AND THICK FILM TECHNOLOGYPhotinon, Kanokorn January 2007 (has links)
No description available.
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Conceptual design of gasification-based biorefineries using the C-H-O ternary diagramLitheko, Lefu Andrew 10 1900 (has links)
This dissertation develops a systematic targeting method based on the C-H-O ternary diagram for the conceptual design of gasification-based biorefineries. The approach is applied using dimethyl ether (DME) as case study. A stoichiometric equilibrium model is presented for calculation of the C-H-O chemical equilibria to evaluate and predict equilibrium syngas composition, operating temperature, type and amount of oxidant required in biomass gasification. Overall atomic species balances are developed and process targets are plotted on the C-H-O ternary diagram. Sustainability metrics are incorporated to provide useful insights into the efficiency of biorefinery process targets. It was found that syngas at 1200 and 1500 K is predominantly H2 and CO. Moreover, DME biorefineries have two main process targets, based on the indirect and direct synthesis routes. Gasification at 1200 K and 1 atm. using H2O/CO2 = 2.642 (w/w) and H2O/CH4 = 1.645 (w/w) achieved syngas composition targets for the direct and indirect methods respectively. Comparatively, the integrated biorefinery based on indirect route was more efficient, producing 1.903 ton of DME per ton of biomass feedstock. The process is 100% carbon-efficient and recycles 1.025 tons of H2O. / Civil and Chemical Engineering / M. Tech. (Chemical Engineering)
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Laminar Flame Speeds and Autoignition of Dimethyl Ether at Elevated Pressures and Temperature using Novel Combustion TechniqueParajuli, Bikash 18 October 2016 (has links)
No description available.
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