Visualization study on particle flow behaviors during atomization in an impinging entrained-flow gasifier

Wu, Xiaoxiang; Guo, Qinghua; Gong, Yan; Cheng, Chen; Ding, Lu; Wang, Fuchen; Yu, Guangsuo

doi:10.1016/j.ces.2020.115834

Cited by 25 publications

(5 citation statements)

References 33 publications

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“…ered sizes and concentrations of coal particles in the particle-laden drops. The behavior of the parameter Umax/U0 depending on We for water-glycerol and particle-laden drops is well described by third-order polynomial functions, Equations (1) and Equation ( 2), respectively. The value of R 2 for water-glycerol drops is 0.97 for the particle-laden drops-R 2 = 0.77.…”

Section: Effect Of We and The Concentration Of Coal Particles On The ...mentioning

confidence: 96%

“…In many technologies, e.g., spraying of composite liquid fuels (CLF) into combustion chambers [1][2][3], 3D printing, including bioprinting [4,5] and printed electronics [6], spraying of liquid friction modifiers [7], the particle-laden drops interact with various media. The development of these technological processes requires knowledge of the particle distributions in drops spreading after impact on the wall and of the effect of these particles on the flow.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Monodisperse Coal Particles on the Maximum Drop Spreading after Impact on a Solid Wall

et al. 2023

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The effect of coal hydrophilic particles in water-glycerol drops on the maximum diameter of spreading along a hydrophobic solid surface is experimentally studied by analyzing the velocity of internal flows by Particle Image Velocimetry (PIV). The grinding fineness of coal particles was 45–80 μm and 120–140 μm. Their concentration was 0.06 wt.% and 1 wt.%. The impact of particle-laden drops on a solid surface occurred at Weber numbers (We) from 30 to 120. It revealed the interrelated influence of We and the concentration of coal particles on changes in the maximum absolute velocity of internal flows in a drop within the kinetic and spreading phases of the drop-wall impact. It is explored the behavior of internal convective flows in the longitudinal section of a drop parallel to the plane of the solid wall. The kinetic energy of the translational motion of coal particles in a spreading drop compensates for the energy expended by the drop on sliding friction along the wall. At We = 120, the inertia-driven spreading of the particle-laden drop is mainly determined by the dynamics of the deformable Taylor rim. An increase in We contributes to more noticeable differences in the convection velocities in spreading drops. When the drop spreading diameter rises at the maximum velocity of internal flows, a growth of the maximum spreading diameter occurs. The presence of coal particles causes a general tendency to reduce drop spreading.

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Section: Effect Of We and The Concentration Of Coal Particles On The ...mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Effect of Monodisperse Coal Particles on the Maximum Drop Spreading after Impact on a Solid Wall

et al. 2023

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“…Coal is still considered as the main feedstock for gasification although there are several material options. Coal gasification, especially entrained flow technology characterized by high efficiency, high carbon conversion, and a fast reaction rate, is the leading and key technology for the clean utilization of coal. − …”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Feng

et al. 2023

Energy Fuels

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Dispersants are chemical moieties that modify interfacial characteristics by adsorption at the solid–liquid interface, and they have been widely used in modern industrial production. This review focuses on the research and perspectives of anionic dispersants for coal–water slurry (CWS). Various common anionic dispersants are briefly summarized, including natural and synthetic species. The interactions between coal particles in the CWS suspension, including van der Waals attraction and electrostatic repulsion, are described by the DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Due to the hydrophobic interaction and the steric effect resulting from the adsorption of polymer dispersants, the extended DLVO theory is introduced to elucidate the various interactions in the CWS system. Based on the interactions between the coal particles, the adsorption behaviors at the coal–water interface, and the interactions between coal and water, the dispersion and stabilization mechanisms are systematically and theoretically discussed. According to the variations of interaction energies between the coal particles, the use of anionic polymer dispersants can weaken the hydrophobic attraction and enhance the steric hindrance and electrostatic repulsion. Also, the rheological behaviors of CWSs are outlined, with emphasis on the pipeline transportation of CWS and the three-parameter Herschel–Bulkley model. Additionally, the properties of anionic dispersants for CWS can be improved by adjusting their chemical structures such as molecular weight, side chain length, rigidity and flexibility of the molecular chain, and variety, quantity, position, and proportion of hydrophobic and hydrophilic groups. In view of the relationships between the structure and property, a direction on the selection and preparation of dispersant for CWS is suggested. Finally, the current challenges and future perspectives of dispersants for CWS are put forward.

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“…It has been experimentally proved that parameters of spraying differ under conditions of high temperatures and physicochemical reactions accompanying the process of coal-water fuel gasification from cold spraying. The behavior of liquid droplets after spraying is usually divided into three types: rotation, deformation, fragmentation and destruction [26].…”

Section: Introductionmentioning

confidence: 99%

“…Analysis of the literature 13–36 allows concluding that the efficiency of CWS application and successful development of coal‐water technologies depend on the atomization characteristics of such fuels. This is significantly influenced by the component composition of slurries and their properties.…”

Section: Introductionmentioning

confidence: 99%

Spraying Characteristics of Alcohol‐Coal‐Water Slurries with Low Coal Content

et al. 2022

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The results of spraying characteristics of alcohol‐coal‐water slurries are presented. It has been experimentally proved that the lowest viscosity value of the studied slurries varies from 54 to 329 mPa s. The density value of alcohol‐coal‐water slurries decreases to 1130 kg m−3 when the content of isopropyl alcohol in the fuel composition is 8 wt %. The largest value of jet spraying angle corresponds to alcohol‐coal‐water fuel with an isopropyl alcohol content of 8 wt %. The number of sufficiently large droplets decreases in comparison with a typical two‐component coal‐water fuel. The calorific value of alcohol‐coal‐water slurries rises when the third liquid fuel component is introduced into the composition of coal‐water fuel.

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Visualization study on particle flow behaviors during atomization in an impinging entrained-flow gasifier

Cited by 25 publications

References 33 publications

Effect of Monodisperse Coal Particles on the Maximum Drop Spreading after Impact on a Solid Wall

Effect of Monodisperse Coal Particles on the Maximum Drop Spreading after Impact on a Solid Wall

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Spraying Characteristics of Alcohol‐Coal‐Water Slurries with Low Coal Content

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