Dispersion mechanism of coal water slurry prepared by mixing various high-concentration organic waste liquids

Wang, Shuangni; Liu, Jianzhong; Pisupati, Sarma V.; Li, Dedi; Wang, Zhihua; Cheng, Jun

doi:10.1016/j.fuel.2020.119340

Cited by 30 publications

(5 citation statements)

References 32 publications

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“…Xanthan gum is a well-known thickener, which performance is considered representative for comparison [29,30,37]. Performance of xanthan gum, MAP, and carbomer are compared in order to examine the e ciency of thickeners.…”

Section: Methodsmentioning

confidence: 99%

Improving the Storage Stability of Coal Water Slurries Use of a pH-Responsive Thickener

Yoon,

Tokmurzin,

Yang

et al. 2024

Korean J. Chem. Eng.

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Coal Water Slurries (CWSs) are considered to be a new form of fuel that can alleviate the environmental and safety issues associated with use of bulk solid fuel. However, CWSs does not always t into existing solid fuel supply and storage chain. In this study, we propose a novel method to control CWSs viscosity using pH responsive thickener, offering the advantages of improved storage stability and on-demand viscosity control, thus allowing CWSs to be used as a c for a variety of applications. This study investigates the effects of additives and pH on the viscosity and storage stability of CWSs. Poloxamer 407, polynaphthalene sulfonate formaldehyde (PNSF), and a copolymer containing pigment-a nic (PA) groups were used as dispersants to lower CWSs viscosity. Xanthan gum, a modi ed acrylic polymer (MAP), and carbomer were used as thickeners for assessing the storage stability and uidity of CWSs based on viscosity changes. Optimal viscosity reduction was achieved by the addition of PA. A viscosity of 7,000 cP was achieved by the use of carbomer, with small amount comparable to 27.3 wt.% of MAP and 22.7 wt.% of Xanthan gum. Moreover, the carbomer-containing CWSs exhibited high storage stability in a 360-h stability test, retaining 84.3% of the original baseline coal content. pH-dependent viscosity changes were observed only in carbomer-containing samples.

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Section: Methodsmentioning

confidence: 99%

Improving the Storage Stability of Coal Water Slurries Use of a pH-Responsive Thickener

Yoon,

Tokmurzin,

Yang

et al. 2024

Korean J. Chem. Eng.

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“…Based on the extended DLVO theory, the van der Waals interaction energy (E v ), electrostatic interaction energy (E e ), hydrophobic interaction energy (E h ), and spatial stability energy (E S ) are compared. The total interaction energy (E T ) is calculated as follows [87]:…”

Section: Electrostatic Repulsionmentioning

confidence: 99%

“…The spatial potential resistance stabilization energy (E s ) of two spherical particles can be calculated as follows [87]:…”

Section: Electrostatic Repulsionmentioning

confidence: 99%

Progress of Dispersants for Coal Water Slurry

Liu,

Wang,

Liu

et al. 2023

Molecules

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Dispersants, serving as an essential raw material in the formulation of coal water slurry, offer an economical and convenient solution for enhancing slurry concentration, thus stimulating significant interest in the development of novel and efficient dispersants. This paper intends to illuminate the evolution of dispersants by examining both the traditional and the newly conceived types and elaborating on their respective mechanisms of influence on slurry performance. Dispersants can be classified into anionic, cationic, amphoteric, and non-ionic types based on their dissociation properties. They can be produced by modifying either natural or synthetic products. The molecular structure of a dispersant allows for further categorization into one-dimensional, two-dimensional, or three-dimensional structure dispersants. This document succinctly outlines dispersants derived from natural products, three-dimensional structure dispersants, common anionic dispersants such as lignin and naphthalene, and amphoteric and non-ionic dispersants. Subsequently, the adsorption mechanism of dispersants, governed by either electrostatic attraction or functional group effects, is elucidated. The three mechanisms through which dispersants alter the surface properties of coal, namely the wetting dispersion effect, electrostatic repulsion effect, and steric hindrance effect, are also explained. The paper concludes with an exploration of the challenges and emerging trends in the domain of dispersants.

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“…Previous research findings [29][30][31] indicate that the main components of promising slurry fuels are coals of different ranks, water and combustible liquids (such as various industrial oils, namely, turbine, transformer, motor, castor, etc.). The studies [32][33][34] present the experimental results illustrating significant differences in the interaction regimes of different slurry fuel component droplets colliding with each other in gas. The sequence of the interaction of component droplets and their role (projectile, target) was found to be of crucial importance.…”

Section: Introductionmentioning

confidence: 99%

Interaction between Droplets and Particles as Oil–Water Slurry Components

et al. 2022

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The characteristics of the collisions of droplets with the surfaces of particles and substrates of promising oil–water slurry components (oil, water and coal) were experimentally studied. Particles of coals of different ranks with significantly varying surface wettability were used. The following regimes of droplet–particle collisions were identified: agglomeration, stretching separation and stretching separation with child droplets. The main characteristics of resulting child droplets were calculated. Droplet–particle interaction regime maps in the B = f(We) coordinates were constructed. Equations to describe the boundaries of transitions between the droplet–particle interaction regimes (B = nWek) were obtained. The calculated approximation coefficients make it possible to predict threshold shifts in transition boundaries between the collision regimes for different fuel mixture components. Differences in the characteristics of secondary atomization of droplets interacting with particles were established. Guidelines were provided on applying the research findings to the development of technologies of composite liquid fuel droplet generation in combustion chambers with the separate injection of liquid and solid components, as well as technologies of secondary atomization of fuel droplets producing fine aerosol.

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Dispersion mechanism of coal water slurry prepared by mixing various high-concentration organic waste liquids

Cited by 30 publications

References 32 publications

Improving the Storage Stability of Coal Water Slurries Use of a pH-Responsive Thickener

Improving the Storage Stability of Coal Water Slurries Use of a pH-Responsive Thickener

Progress of Dispersants for Coal Water Slurry

Interaction between Droplets and Particles as Oil–Water Slurry Components

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