The preparation of stable waterinoil (W/O) emulsion is critical for the success of production of stable coaloilwater slurry. The present study was undertaken to experimentally investigate ...
Herein, a method of mixed combustion of meager coal and SCCB in a pulverized coal furnace for disposal of SCCB is proposed, and thermogravimetric mass spectrometry (TGMS) is used to characterize the combustion and gas release characteristics. The effects of the heating rate and mixing ratio on combustion are analyzed as well.
Fu et al. [16] and Zhu et al. [17] studied the effects of light oil, fine coal powder, and water content as well as the properties of surfactants on the rheology and stability of synthetic fuels. Guo et al. [18] studied the rheological properties of a new type of synthetic fuel composed of residual oil, coal powder, and water.
In industrial process engineering, mixing is a unit operation that involves manipulation of a heterogeneous physical system with the intent to make it more examples include pumping of the water in a swimming pool to homogenize the water temperature, and the stirring of pancake batter to eliminate lumps (deagglomeration).. Mixing is performed to allow heat and/or mass ...
As a new type of nozzle, the internal mixing air atomizing nozzle has been widely used in the field of dust reduction via spraying. In this study, the effect of water supply pressure on the atomization characteristics and dustreduction efficiency of the internal mixing air atomizing nozzle was investigated. Firstly, the FLUENT software was used to simulate the flow field inside and outside ...
Further, the comprehensive performance of the waste oilcoalwater slurry, including slurry ability, stability and fluidity, was found to be best at a water content of 10% and a Tween 80 content ...
Coal powder was placed in a xanthan gum solution having concentration identical to that of the WCWS. The adsorbed suspension was subjected to highspeed centrifugation to separate the wet coal powder. The coal powder was dried in an oven at 60 °C, and pressurized and polished into a tablet with a thickness of mm and diameter of 2 cm.
The effects of process parameters such as reformer temperature (700850 °C), steam/coal ratio (S/C) () and air equivalence ratio (ER) () on the composition of product gas, lower heating value (LHV), tar content, yield of product gas, the carbon and water conversions and the cold gas efficiency were investigated.
Coal water slurry (CWS) is a fuel which consists of fine coal particle suspended in water. Presence of water in CWS reduces harmful emissions and makes the coal explosion proof thus makes it useful as a liquid fuel. The concept of coal water slurry dates back to Smith and Munsell (1879) [1] when patented for coal oil
The present review paper summarizes the uptodate research advancements made in the use of mixed reagent systems to improve the separation efficiency of coal flotation. Experimental and molecular dynamics simulation approaches have been adopted to enhance floatability, and reagent adsorptions are also discussed.
The coal pitch water slurry was prepared by coal pitch powder, dispersants and two different kinds of coking wastewater. The apparent viscosity, rheological behavior and stability of the coal pitch water slurry were investigated. The results indicated that both the two kinds of coking wastewater could be used to prepare coal pitch water slurry. Moreover, the adsorption of dispersants and zeta ...
This invention relates to a mixed fuel comprising a coal powder or the like and heavy oil obtained by adding and mixing a dilute aqueous solution of a watersoluble highmolecular compound and a carbonaceous solid fuel powder such as coal powder or the like (hereinafter referred to as "coal powder and the like") to heavy oil so as to disperse the coal powder and the like and water (in very ...
Activated charcoal is thought to offer several other benefits, including less gas and flatulence, lower cholesterol levels, and improved kidney function. Some people claim that it helps whiten ...
The pulping steps were as follows [22]: (1) measure out the weights of coal powder, additives, and liquids (deionized water and waste oil) required to make up the slurry; (2) pour the additives and liquids into a stirring tank with a capacity of 200 mL and adjust the speed of the mixer to 400500 r/min to fully dissolve the additives; (3) add ...
Simple manual mixing of hydrophobic coal and water is obviously insufficient to produce a stable suspension. ... 75 g of coal powder and 75 mL of water were at the same time placed in the beaker of a hydrodynamic rotarytype mixer Waring blender 80100 with a twoblade impeller of wedge profile, and the wedge angle of the cavitator was α = 60 ...
Results show that the addition of sludge can improve the static stability for slurries prepared by lean coal, coking coal, and lignite. The effect on stability of coking coalwater slurry is the most significant. The proportion of sludge to lean coal added in the slurry can be maintained at 10% to 15%.
Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process.
To accurately verify the effect of coal cuttings on waterbased polymer drilling fluids, we add coal powders to the drilling fluid, and measure their performance after mixing the coal powders. Because the large particles below 60 mesh of coal cuttings mixed in the drilling fluid are removed by the solid control device in field drilling ...
The specimens were manufactured and maintained according to the GB/T 50, standard. HJW60 mixer was used to mix cement, coal gangue powder, tailings powder, and coal gangue manufactured sand for 2 min, and then water was added to stir for 2 min. After mixing evenly, the material was discharged.
void fraction of the coal powder beds is the porosity of particle bed when the voids of coal particle bed are filled with water. Void fraction of CWS was calculated by the following equation (Henterson,, 1978). ε = V. s V. c (2) V. s. where ε, V. c, V. s . referred to as void fraction, volume of coal, and volume of slurry ...
If you'd like, you can mix a little cocoa powder into the vegetable oil to make it show up better and look more like crude oil. Fill the bowl with water to an inch or two below the rim. Place it on a table, and have everyone crowd around it. Pour a little oil on the water. Now, watch what happens. The oil, even a little drop, will spread out ...
At the Second CoalOil Mixtures Conference, in Danvers, MA, 1979, it was proposed, possibly seriously for the first time, that coaloil slurries should be produced by wet grinding of the coal in oil rather than dry grinding followed by mixing the powder into the oil. Blending powdered coal into fuel oil, typically bunker oil, was, indeed ...
Summary. Bentonite is a type of clay that is prized for its porosity, workability and nontoxic nature. In foundry applications, it is used with coal (bentonitecoal) in sand/green sand molding for metal castings; where it enhances the refractory properties of the mold whilst also increasing strength and flowability.
Abstract. The main objective of this research was to investigate the effect of coal waste powder as filler material in hot mix asphalt. After sampling the coal waste material from a coal washing plant, it was processed to achieve natural coal waste filler. Furthermore, after incinerating the natural coal waste powder at 750 °C, the coal waste ...
In this paper, the optimal process conditions for coalbiomass copyrolysis were obtained through pyrolysis experiments. The results show that under the condition of the pyrolysis temperature of 500 °C, the pyrolysis oil yield and positive synergistic effect reach the maximum, and the ratio of coal to biomass raw materials is 1:3. The effects of three loading methods (coal loading on ...
The coaloilwater slurry is a new type of oilbased synfuel composed of finely pulverized coal, oil and water. It has lower viscosity, lower ignition point and higher heating value than coal ...
The effects of particle size, oil shale content, dust concentration, dispersion pressure and inert dust on the minimum ignition temperature (MIT) of coal and oil shale mixed dust clouds (COSMD) were investigated in a dust cloud MIT testing system to understand the intrinsic mechanisms of these factors affecting the MIT of COSMD. The results demonstrated that 1) COSMD with larger particle size ...
In view of the disadvantage that coal waste powder(CWP) can reduce the crack resistance of asphalt mortar at low temperature, silane coupling agent KH550 was used to modify coal waste powder. The surface characteristics and modification mechanism of silane coupling agent modified coal waste powder were characterized by using Scanning Electronic Microscopy (SEM). Five kinds of silane coupling ...
In this study, the combined effect of chemical composition and spreading velocity of collector on flotation performance of oxidized coal was investigated. Oxidized coal samples were prepared using the H 2 O 2 solution oxidation method. The contents of oxygencontaining groups on the coal surface increased with the oxidation degree by Xray photoelectron spectroscopy (XPS) analysis and the coal ...
Municipal sludge (MS) is used to prepare coal water slurry (CWS). This practice is beneficial for resource utilization and reduces treatment costs and environmental pollution. In this study, alkalimodified municipal sludge (AMS) was prepared with Ca(OH)2 as modifier and mixed with coal to produce AMSCWS. The effect and mechanism of MS and AMS on slurry ability, stability, and combustion ...
The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic aciddodecane (OAD), oleic acid (OA), and dodecane (D) were employed to treat the low rank coal for revealing new synergistic mechanism of the mixed collector. First the surface free energy of the coal, the surface free energy of coalwater and ...
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