Experimental study on the injection performance of the gas-solid injector for large coal particles

Yang, Dong‐Yeol; Bang-sheng, Xing; Li, Jianping; Wang, Yanxiang; Gao, Kuidong; Zhou, Feng; Xia, Youtao; Wang, Wenwen

doi:10.1016/j.powtec.2019.11.087

Cited by 20 publications

(10 citation statements)

References 22 publications

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“…Microspheres (Table ) were purchased from Cospheric. Coal specimens were obtained from the Shitun mine in China and were sieved to collect submillimeter particles. , The piezoelectric dispenser was placed above the surface with a spacing of 5–10 mm, and turned on to dispense monodisperse deionized water droplets having a radius of ≈18 μm beside a target particle on the superhydrophobic surface. The addition of the dispensed droplets in the target position led to the growth of a larger droplet.…”

Section: Methodsmentioning

confidence: 99%

“…Particles having irregular (nonspherical) shapes may exhibit different particle−droplet coalescence dynamics and jumping behavior. As shown in Figure 5A, when coalescing with a wedge-like coal particle (θ < 60°, ρ p = 1200−2500 kg/m 3 ), 41 the droplet spreads asymmetrically to wet the particle surface by preferably wetting the top side. The asymmetric wetting results in simultaneous particle revolution that leads to oblique angle jumping (θ j ≈ 70°) accompanied by rotation.…”

Section: Energy Conversion Analysismentioning

confidence: 99%

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Particulate–Droplet Coalescence and Self-Transport on Superhydrophobic Surfaces

Yan

Feng

et al. 2022

ACS Nano

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Particulate transport from surfaces governs a variety of phenomena including fungal spore dispersal, bioaerosol transmission, and self-cleaning. Here, we report a previously unidentified mechanism governing passive particulate removal from superhydrophobic surfaces, where a particle coalescing with a water droplet (∼10 to ∼100 μm) spontaneously launches. Compared to previously discovered coalescence-induced binary droplet jumping, the reported mechanism represents a more general capillary-inertial dominated transport mode coupled with particle/droplet properties and is typically mediated by rotation in addition to translation. Through wetting and momentum analyses, we show that transport physics depends on particle/droplet density, size, and wettability. The observed mechanism presents a simple and passive pathway to achieve self-cleaning on both artificial as well as biological materials as confirmed here with experiments conducted on butterfly wings, cicada wings, and clover leaves. Our findings provide insights into particle–droplet interaction and spontaneous particulate transport, which may facilitate the development of functional surfaces for medical, optical, thermal, and energy applications.

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Section: Methodsmentioning

confidence: 99%

Section: Energy Conversion Analysismentioning

confidence: 99%

Particulate–Droplet Coalescence and Self-Transport on Superhydrophobic Surfaces

Yan

Feng

et al. 2022

ACS Nano

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“…Coal slime 1 has low density and fluidity, which is convenient for pneumatic conveying; coal slime 2 contains coal pulverized sand, minerals, clay, and other substances, which have the characteristics of high water content, high viscosity, high ash content, and low heat generation. The two types of coal slime were dried, crushed, and sieved separately, and coal slime particles with particle size below 1 mm were used as experimental materials, and Figure 2(c) shows the particle size percentage curve of the samples, and the particle size distribution is in accordance with the R-R distribution model [12] as shown in equation (3).…”

Section: 2sample Preparationmentioning

confidence: 99%

Experimental study of resistance test of relative motion of metal sheet and coal slime

Duan,

Yang,

Cheng

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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Ash and other impurities in raw coal can adhere to equipment surfaces during transportation, causing surface corrosion and transportation blockage. To investigate the effect of different water contents on the adhesion force of coal slime, the adhesion mechanics relationship between the relative motion of coal slime and metal surfaces was investigated. Six coal slime samples with different water contents were configured for the adhesion tension experiments with relative motion, and the composition measurements of the coal slime samples were carried out to analyse the effects of coal slime water content and relative motion speed on the adhesion tension of metal sheets. It was found that both the water content of coal slime and the relative motion speed affected the adhesion tension between the metal surface and coal slime, in which the effect of the water content of coal slime on the adhesion tension of the metal sheet was greater than that of relative motion speed.

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“…The uniformity of air and powder flow distribution in the boiler burner system directly affects the pulverized coal combustion effect and is directly related to the economy and safety of coal-fired units. The air and powder flow distribution process of a boiler burner system is a typical gas–solid two-phase flow, and its flow characteristics are affected by structural parameters, flow parameters, and particle sizes. – Patro and Dash , mainly studied the effects of various parameters such as gas phase velocity and solid–gas ratio on the flow characteristics in horizontal and vertical pipes. Li et al – used the CFD-DEM coupling method to simulate and verify the movement characteristics of pulverized coal particles in swirl pneumatic conveying processes, mainly revealing the flow characteristics, velocity distribution, and resistance characteristics of pulverized coal particles, which can provide a reference and theoretical basis for the design of pulverized coal conveying pipelines.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Gas–Solid Two-Phase Flow Characteristics of a Vertical Cyclone Combustor System

Xu,

Tang,

Wang

et al. 2023

ACS Omega

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According to the design and operational parameters of the cyclone liquid slag-discharging boiler, an experimental platform for the cyclone burner was designed and constructed in a cold state based on the principle of similarity. The experimental study investigated the effects of parameters, such as swirl-vane angles, coal concentration, operating parameters, and particle size, on the flow distribution and vertical riser resistance characteristics of the vertical cyclone burner. The results showed that there were differences in flow distribution among the cyclone burners, and the most uniform flow distribution was achieved when the swirl-vane angle of the primary air was 30°. The concentration of pulverized coal significantly influenced the pressure drop in the vertical ascending section, which increased with higher concentrations of pulverized coal. When the concentration of pulverized coal remains constant, the pipeline pressure drop is minimized at a primary air velocity of 7.5 m/s. As the secondary wind speed increased, the pressure drop consistently rose; when the secondary wind speed is 22 m/s, the pressure drop of the pipeline is the maximum; however, excessively high secondary wind speeds were found to be detrimental to the formation of an optimal aerodynamic field in the burner. Furthermore, when the pulverized coal concentration was held constant, materials with larger particle sizes exhibited the highest pressure drop. When the particle size increases from 50 to 150 μm, the pressure drop of the vertical riser segment also increases. Finally, based on the Barth additional pressure drop theory, the pressure drop formula of the vertical riser is fitted by a dimensional analysis method, and the correlation formula of the pressure drop test of gas–solid two-phase flow in the vertical riser is obtained.

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Experimental study on the injection performance of the gas-solid injector for large coal particles

Cited by 20 publications

References 22 publications

Particulate–Droplet Coalescence and Self-Transport on Superhydrophobic Surfaces

Particulate–Droplet Coalescence and Self-Transport on Superhydrophobic Surfaces

Experimental study of resistance test of relative motion of metal sheet and coal slime

Experimental Study on Gas–Solid Two-Phase Flow Characteristics of a Vertical Cyclone Combustor System

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