Mechanism of the Effect of a Finely Dispersed Coal Fraction on the Rheological Properties of Water-Suspended Coal Fuels

Mingaleeva, G. R.; Шамсутдинов, Э. В.; Ermolaev, D. V.; Афанасьева, О. В.; Gil’manov, R. M.; Fedotov, A. I.; Галькеева, А. А.

doi:10.1007/s10553-014-0470-z

Cited by 3 publications

(1 citation statement)

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“…Also, the shear elasticity of the paste significantly affects its transient flow characteristics, especially under rapid pressure variations within the pipeline. , The shear stress of the viscoelastic fluid hammer is considerably lower than that of non-Newtonian fluid with similar viscosity. Furthermore, the presence of viscoelasticity leads to higher pressure oscillations. − Extensive research has been conducted by scholars on the impact of concentration, temperature, particle size, and additives on coal slime viscosity. − Xiao et al examined the rheological properties of coal slime with solid concentrations ranging from 45 to 61% and analyzed how temperature and concentration influence the rheological properties within a shear rate range of 1 to 200 s –1 . The findings indicate that the rheological properties of coal slime align well with the Bingham model.…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of High Concentration Coal Slime

Zheng,

Jiang,

Cheng

et al. 2024

ACS Omega

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Concentrated coal slime serves as a clean and promising fluid fuel and is commonly employed via pipeline transportation. Currently, there are still limitations in understanding the rheological properties of coal slime, including its yield stress, viscoelasticity, and the impact of factors, such as temperature, on these properties. Therefore, we conducted tests to examine the rheological properties and yield stress of coal slime at various temperatures for two different concentrations using a pipeline transportation system and rheometers. Furthermore, due to the challenges in measuring dynamic yield stress caused by the shear bands of highly viscous slime, a method using the residual pressure inside the pipeline after cessation of transportation is proposed. The viscoelasticity of coal slime at various temperatures was examined through oscillatory shear tests. Finally, the pressure wave velocity in the pipeline transportation system was used to determine the bulk modulus. The results indicated that the shear stress under high shear rates decreased with an increase in temperature, while the yield stress and shear stress under low shear conditions gradually increased with temperature. The coal slime exhibited certain viscoelasticity with shear elasticity increasing as the temperature rose. The pressure wave velocity in the pipeline remained constant and did not vary significantly with temperature.

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