Consequently combustion equipment has to be derated. An attempt to overcome this has involved emulsifying water with coaloil mixtures (40 wt % coal, 40 wt % oil, 10 wt % water) with the intention of causing disruptive combustion. ... A 50:50 blend (or 1:1 blend) includes 50% of the volume of the powder as fly ash and 50% of the volume of ...
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The effects of several parameters in terms of the fuel category, the heating rate, the coal/coke mass flow ratio, the CO2 partial pressure, and the Ca/S molar ratio on the ignition and burnout ...
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DOI: / Corpus ID: ; Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO2 cogasification article{Wang2021SynergisticEO, title={Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO2 cogasification}, author={Jianbin Wang and Jian Chen and Jianzhong Liu and He Liu and Mingxia Wang and Jun Cheng ...
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The pitch was pretreated using nitric acid (HNO 3) and a thermal treatment step; this process increased the softening point of the pitch which improves the ing properties [6] and allows better physical mixing of the pitch with the coal powder. We investigated the effect of pitch pretreatment conditions on the final carbon properties by ...
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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 ...
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The attraction of the coalwater slurry is its complete independence of an oil supply; coaloil mixtures are effectively a means of extending oil supplies and are less economically beneficial. Coalwater slurry is simply produced by mixing pulverised coal with water together with a small amount of a surfactant and a stabilizing agent.
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Abstract. Coaloilwater slurry (COWS) synfuel can be prepared successfully by waste engine oil (WEO), water and coal in the existence of Tween 80 and SL. The effects of coal type, coal particle size distribution, and WEO blending proportion (α) on the slurryability of COWS were investigated, and certain essential properties, such as ...
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The effect of addition sequence for mixed collectors comprising of dodecane(D) and nvaleric acid(A) on lowrank coal flotation was explored by the following three sequences: D first and then A(D + A), A first and then D(A + D), D and A were added simultaneously(M). The total organic carbon, contact angle, zeta potential, and Xray photoelectron spectroscopy results revealed that the coal had ...
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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.
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Coalwater slurry or coalwater mixture (CWS or CWM) is a complex solidliquid dispersion. Several research works have been done concerning the production and use of CWSs being developed worldwide in several different governmental, industrial and academic facilities. In the present paper, studies on the developments achieved in the past three decades with regard to the field mentioned ...
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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 ...
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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 ...
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Mixing 50 mg coal sample and 40 mL deionized water to prepare suspension. The suspension was agitated for 9 min using a magnetic stirrer and the reagents were added following the flotation tests conditions during the process. ... (40 °C). The powder was pressed into coal pieces to measure the water contact angle using the DSA100 contact angle ...
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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 ...
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A study by Xu et al. (2019) examined the effects of coal waste as filler on the functional characteristics of asphalt mastics and mixtures. The study investigated the effects of coal waste on asphalt mastics and mixtures considering various fractions of mass (20 %, 40 %, 60 %, 80 %) for fine limestone powder replacement as a filler.
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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 ...
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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 ...
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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 ...
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Moreover, Yi et al. [6] used bio oil from biomass pyrolysis to prepare coal water slurry to confirm that the coal water slurry changed from weak to strong pseudoplastic fluid with the increase in the water content of bio oil. Zhang et al. [7] prepared coal water slurry by using waste engine oil and proposed that the possible stabilization ...
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Performance of fiber reinforced asphalt concrete under environmental temperature and water effects. Constr. Build. Mater. (2010) T. Xu et al. ... Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts. Journal of Cleaner Production, Volume 91, 2015, pp. 262268 ...
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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.
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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.
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In this study, a microemulsion was prepared by mixing dodecyl trimethylammonium bromide (DTAB) and diesel oil; its effect on lowrank coal flotation was studied via water contact angle and wrap ...
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In this study, a microemulsion was prepared by mixing dodecyl trimethylammonium bromide (DTAB) and diesel oil; its effect on lowrank coal flotation was studied via water contact angle and wrap angle measurements. The results show that the clean coal could not be effectively recovered using a single reagent of DTAB or diesel oil.
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Coal waste is a byproduct that produced in coal washing plants. The accumulation of coal waste in the nature causes several ecological and environmental problems. The main objective of this study was to investigate the applicability of coal waste powder and its produced ash as fillers in hot mix asphalt (HMA) compared to the conventional fillers.
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Adhesion forces for water/oil droplet and bubble on coking coal surfaces with different roughness. ... Surface properties of aged coal and their effects on bubbleparticle attachment during flotation. Adv Powder Technol, 31 (4) ... Effect of microemulsion on lowrank coal flotation by mixing DTAB and diesel oil. Fuel, 260 (2020), p. 116321.
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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 ...
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Coal mine paste filling technology can effectively solve the problems caused by coal mining and is a key technology to realize green mining and is widely used in coal mining (Qi et al. 2019; Qian et al. 2018; Qi 2020).In coal mine paste filling technology, the performance of filling materials directly determines the filling effect of a coal mine; and the cemented paste backfill (CPB) setting ...
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