Study on the performance and emissions of a compression ignition engine fuelled with dimethyl ether

Wang, H. W.; Zhou, Lei; Jiang, Deming; Huang, Zuohua

doi:10.1243/0954407001527268

Cited by 47 publications

(21 citation statements)

References 3 publications

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“…Dimethoxymethane (DMM) is the smallest member of the family of oxygenated methyl ethers (OMEs). OMEs (CH 3 −O−(CH 2 −O) n −CH 3 ) turn out to be beneficial additives for diesel fuels: They reduce soot [3,2,29], noise [47] and increase the efficiency by altering viscosity, lubricity, and cetane number [18]. Especially their positive influence onto the soot-NO x tradeoff [38,50] makes them attractive in the context of current pollutant challenges.…”

Section: Introductionmentioning

confidence: 99%

Detailed kinetic modeling of dimethoxymethane. Part I: Ab initio thermochemistry and kinetics predictions for key reactions

Kopp

Kröger

Döntgen

et al. 2018

Combustion and Flame

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Despite the great interest in oxygenated methyl ethers as diesel fuel additives and as fuels themselves, the influence of their methylenedioxy group(s) (O−CH 2 −O) has never been quantified using ab initio methods. In this study we elucidate the kinetics and thermochemistry of dimethoxymethane using high-level ab initio (CCSD(T)/aug-cc-pV(D+T)Z//B2PLYPD3BJ/6-311++g(d,p)) and statistical mechanics methods. We model torsional modes as hindered rotors which has a large influence on the description of the thermal behavior. Rate constants for hydrogen abstraction by. H and. CH 3 are computed and show that abstraction from the methylenedioxy group is favored over abstraction from the terminal methyl groups. β-Scission and isomerization of the radicals is computed using master equations. The effect of rovibrationally excited radicals from preceding hydrogen abstraction reactions on subsequent hot β-scission is computed and has large influence on the decomposition of the formed dimethylether radical. In the second part of this study, the computed kinetics and thermochemistry is used in a detailed model. The quantification of the effect of the dominant methylenedioxy group using ab initio methods can guide modeling of oxygenated methyl ethers that contain that group several times.

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Section: Introductionmentioning

confidence: 99%

Detailed kinetic modeling of dimethoxymethane. Part I: Ab initio thermochemistry and kinetics predictions for key reactions

Kopp

Kröger

Döntgen

et al. 2018

Combustion and Flame

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“…Compared with traditional diesel, DME fueled engines generate less noise, and emit fewer pollutants (particulates, NO x, hydrocarbons, and CO). However, it has a lower energy density than diesel, so a double-sized tank is needed to maintain similar travel range [286]. DME engines have certain special requirements: a vapor pressure of 510 kPa at 25°C, low viscosity and lubricity, with compressibility rising near full load conditions.…”

Section: Synthesis Of Oxygenatesmentioning

confidence: 99%

Methane emissions as energy reservoir: Context, scope, causes and mitigation strategies

Chai

Tonjes

Mahajan

2016

Progress in Energy and Combustion Science

102

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A B S T R A C TMethane (CH4) is now considered a bridge fuel between present fossil (carbon) economy and desired renewables and this energy molecule is projected to play an important role in the global energy mix well beyond 2035. The atmospheric warming potential of CH4 is 28-36 times, when averaged over a 100-year period, that of carbon dioxide (CO2) and this necessitates a close scrutiny of global CH4 emissions inventory. As the second most abundant greenhouse gas (GHG), the annual global CH4 emissions were 645 million metric tons (MMT), accounting for 14.3% of the global anthropogenic GHG emissions. Of this, five key anthropogenic sources: agriculture, coal, landfills, oil and gas operations and wastewater together emitted 68% of all CH4 emissions. Landfills are ranked as the third highest anthropogenic CH4 emission source, behind agriculture and coal mines, and emissions from the waste sector are expected to reach almost 800 million metric tons CO2 equivalent (MMTCO2e) in 2015.The two largest economies spewed out 42% (14% (US) and 28% (China)) of the world's total greenhouse gas (GHG) emissions; these two countries are also the largest producers of municipal solid waste (MSW). The United States averages 250 MMT of MSW annually, of which about 63% enters landfills. In 2015, there were 2434 landfills in the United States and CH4 from these landfills accounted for 138 MMTCO2e released into the atmosphere and represents 17.7% of all US CH4 emissions. China had 580 landfills and treated 105 MMT of MSW in 2013. Methane produced from landfills contributes about 13% of total CH4 emissions in China. Almost 50% of landfills in China did not install efficient LFG collection and utilization systems to make them manageable so a great deal of CH4 and CO2 are emitted without intervention. Recent data show that globally, 45 billion cubic meters (bcm) of CH4 or 282 million barrels of oil equivalent (boe) was annually released from landfills into the atmosphere. Managing methane emission from landfills is a global challenge, though China lags behind in managed landfills that contribute to adverse health effects on the population. Moreover, the rich organic content of MSW in China indicates that CH4 emissions there may be underestimated. The China unmanaged landfill scenario is further duplicated in developing as well as in least-developed countries.This review starts with a dialog on CH4 emissions and climate change and the chemical changes the CH4 molecule undergoes in the atmosphere (Section 1). Section 2 deals with identification of global CH4 emissions from key sources, particularly anthropogenic, among those are agriculture, coal mines, landfills, oil and gas operations and wastewater. Although each of these sources is descriptive on their own, the focus of Section 3 is on landfills with particular emphasis on the United States and China, two largest producers of waste. The quantitative measurement of CH4 emissions is still uncertain so Section 4 is devoted to various CH4 estimation models, such as United States Environm...

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“…Two direct injection single diesel engines were used in the study. The DME engine was modi®ed from a diesel engine with some change in the parameters (see Table 1) on the basis of the authors' earlier experimental studies [4,5]. A DME engine with these parameters will achieve optimum performance.…”

Section: Test Engine and Fuel Propertiesmentioning

confidence: 99%

“…Their results show that the engine can achieve ultralow emission without fundamental change to the combustion system. Huang et al [4,5] investigated the combustion and emission characteristics in a compression ignition engine with DME and found that the DME engine has high thermal eciency, short premixed combustion and fast diusion combustion, making it possible to achieve low-noise, smoke-free combustion. Kajitani et al [6] studied the DME engine with delay in the injection time to reduce both smoke and NO x .…”

Section: Introductionmentioning

confidence: 99%

Technical Note: Investigation on emission characteristics of a compression ignition engine with oxygenated fuels and exhaust gas recirculation

Wang

Huang

Zhou

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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Investigations of emission characteristics were carried out on a compression ignition, dimethyl ether engine (DME) with exhaust gas recirculation (EGR) and on a diesel engine with a dimethyl carbonate (DMC) additive. The experimental results show that the DME engine with EGR can simultaneously reduce smoke and NO x emissions. The NO x can be reduced by about 20 per cent for every 10 per cent of EGR introduction, while smoke remains at zero. The diesel equivalent brake speci®c fuel consumption (b.s.f.c.) shows a slight decrease when DMC is added, while the eective thermal eciency shows a slight improvement. It is found that the smoke reduction rate and smoke show a linear relationship with DMC percentage or oxygen mass percentage in the diesel fuel. For the speci®c brake mean eective pressure (b.m.e.p.), smoke will be reduced by 20 per cent for every 10 per cent DMC added and by 40 per cent when the oxygen mass percentage in the fuel reaches 10 per cent. The CO decreases when DMC is added, while NO x shows an increase. This dierence is pronounced at a high b.m.e.p. For the speci®c b.m.e.p., CO and NO x show a linear relationship with DMC mass percentage in the fuel; CO will be reduced by 20 per cent while NO x will be increased by 20 per cent for every 10 per cent DMC added.

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Study on the performance and emissions of a compression ignition engine fuelled with dimethyl ether

Cited by 47 publications

References 3 publications

Detailed kinetic modeling of dimethoxymethane. Part I: Ab initio thermochemistry and kinetics predictions for key reactions

Detailed kinetic modeling of dimethoxymethane. Part I: Ab initio thermochemistry and kinetics predictions for key reactions

Methane emissions as energy reservoir: Context, scope, causes and mitigation strategies

Technical Note: Investigation on emission characteristics of a compression ignition engine with oxygenated fuels and exhaust gas recirculation

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