The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
It is of great importance to develop efficient catalysts to achieve sulfur removal in fuel, protecting the world against the pollution caused by sulfur oxides. Aiming that, polyoxometalates supported materials have been employed as a vital class of heterogeneous catalysts for oxidative desulfurization. In this study, a serial of magnetic polyoxometalates-based mesoporous silica hybrid materials were...
Phenomenological studies relating to the oscillation of buoyant diffusion flames are very important to design flare systems in the energy and petrochemical industry or develop an image recognition algorithm for wind-aided fire detection. In this work, the oscillation frequency for the “down-wash mode” buoyant diffusion propane flames (momentum flux ratio of jet to cross-wind<0.1, 6×10−5<Froude...
This paper reports an interesting experimental phenomenon regarding flame radiant fraction and flame volume of laminar diffusion methane flames under sub-atmospheric conditions. The quantitative formula of flame volume was derived by assuming that the shape of the flame was cylindrical, with which the relation between flame volume and ambient pressure was obtained. Then the dependence of flame radiant...
Buoyancy and momentum are two major driving forces that affect the behavior of diffusion flames, which have not been fully interpreted in sub-atmospheric environments. In this work, a theoretical model based on the cylindrical flame shape is proposed incorporating with the flame width and height in order to predict the steady flame height with Richardson number. The theoretical equation of dimensionless...
O2−) was the active oxygen species and DBTO2 was the only oxidation product of DBT in the ECODS system. The recycling experiments indicated that sulfur removal could still reach 95.5% after 12 times.
Supported ionic liquid catalysts with different loading of [Bmim]FeCl4 embedded in silica gel were synthesized and characterized. The results demonstrated that ionic liquid [Bmim]FeCl4 was embedded in the silica gel successfully with no destruction to its structure. The amount of [Bmim]FeCl4 was decreased sharply in the extractive coupled with catalytic oxidative desulfurization (ECODS) system. The...
Observations based on short-duration experiments under microgravity of the characteristics of laminar jet diffusion flames burning in coflowing air conditions are described. Experimental conditions were such to establish a flow with Reynolds number of 140 and low air flow velocities of 0–0.5m/s to produce steady laminar flames. Previous studies ignored effects of air flow velocity with small air stream...
A series of W-containing mesoporous silicas with different calcination temperatures were in situ synthesized by using [(n-C 8 H 17 ) 3 NCH 3 ] 2 W 2 O 11 not merely as a novel template but also the W precursors. The catalysts were characterized by N 2 adsorption–desorption, XRD, XPS, HRTEM, EDS, ICP, FTIR, and UV–vis DRS analysis. The...
To investigate the effect of low air pressure on the combustion characteristics and puffing flame frequency of pool fires, ethanol and n-heptane pool fires were performed using 15 square burners of various size in both Lhasa (altitude: 3650m; air pressure: 65kPa) and Hefei (altitude: 24m, air pressure: 100.8kPa) fire laboratories. Comparison of the experimental results for pool fires of the same size...
The combustion process and fluid flow in a compression ignition natural gas engine with separated chamber are studied by coupling Multi-dimensional Computational Fluid Dynamic (CFD) code FIRE with detailed chemical kinetic mechanism. The calculated data are first validated by experimental data. Subsequently, Multidimensional simulations at a baseline condition are carried out to investigate combustion...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.