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In this paper, Eddy Dissipation Concept (EDC) extinction model, for the first time, was implemented to simulate turbulent pulverized coal combustion with the consideration of the effects of intermediate species and the interaction between chemical kinetics and turbulence. Chemical reaction of the vital gas reactions is set to cease in the fine structures wherever the characteristic turbulent time...
In order to study the effects of electric field intensity and distribution on flame propagation speed, the paper investigated the flame propagation of premixed CH4/O2/N2 mixtures under direct-current (DC) electric fields at an excess air ratio of 1.4. Different high-voltage electrodes were chosen in the experiment in two aspects: electrodes size (the outer-diameter of high-voltage electrodes) and...
The microscopic mechanism of the volume swelling of CO 2 –alkane (decane, octane, hexane and cyclohexane) systems and the effects of temperature, pressure and alkane structure on the volume swelling of CO 2 –alkane systems are investigated by performing molecular dynamics simulation. It is shown that the increase in pressure, the reduction in temperature and the straight-chain structure...
Investigation on the characteristics of ion current in a direct-injection stratified-charge engine fueled with methanol was conducted. The test engine is a retrofitted 4-cylinder diesel engine with installation of a spark plug. Ion current was measured using the spark plug as ion sensor. Cylinder pressure was recorded and cylinder average temperature was calculated. The band-pass filtering and low-pass...
A series of NiMo catalysts supported on 3-Dimension cubic Ia3¯d mesoporous KIT-6 silica were prepared by co-impregnation method using citric acid (CA) as chelating agent to adjust the sulfidation and dispersion degrees of active phase. Dried catalysts without calcination were tested in the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT). Impregnation solutions, supports, and...
Synthesis of 5-ethoxymethylfurfural (EMF) from the etherification of 5-hydroxymethylfurfural (HMF) and the dehydrative etherification of fructose over K-10 clay supported dodecatungstophosphoric acid (abbreviated as K-10 clay-HPW). 30%wt.% K-10 clay-HPW was found to be the efficient and robust catalyst for the synthesis of EMF. The highest EMF yield of 91.5% was obtained from HMF after 10h at 100°C...
An experimental study on the convection effect on the ignition behavior of single coal particles with size of ∼1.5mm was carried out in an electrically heated vertical tube furnace under various O 2 concentrations and temperatures ranging from 873K to 1123K. Under all test conditions, anthracite particles ignited heterogeneously. However, the ignition mechanism of the bituminous coal particles...
Efficient synthesis of 5-ethoxymethylfurfural (EMF) has been developed from various carbohydrates in ethanol through a one-pot reaction strategy. Commercially available AlCl 3 showed a high catalytic activity for the conversion of carbohydrates into EMF. EMF was obtained in a high yield of 92.9% from the etherification of 5-hydroxymethylfurfural (HMF) by ethanol. More importantly, EMF could...
Combustion and emissions of a DI diesel engine fuelled with diesel-oxygenate blends were investigated. The results show that there exist the different behaviors in the combustion between the diesel-diglyme blends and the other five diesel-oxygenate blends as the diglyme has the higher cetane number than that of diesel fuel while the other five oxygenates have the lower cetane number than that of diesel...
In this paper, combustion characteristics of a direct-injection spark-ignited engine fueled with natural gas–hydrogen blends under various ignition timings and lean mixture condition were investigated. The results show that the ignition timing has significant influence on engine performance, combustion and emissions. The time intervals between the end of fuel injection and ignition timing are very...
More than 60 heavy oils samples, belonging to the hydrogen adding tail oil, catalytic oil slurry, catalytic heavy oil slurry and catalytic heavy tar waxy oil, which taken from different processing units in Nanjing Refinery, are analysed by 1 H NMR and column chromatography. The analytical data of the heavy oils by two methods are compared and correlated, while good relationships between the...
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