Rheological behavior of coal-water slurry using sodium tripolyphosphate as a ​dispersant

Rao, M. Ananda; Kumar, M. V. Pavan; Rao, S Subba; Narasaiah, N.

doi:10.1080/19392699.2018.1485664

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…Відтоді проведено велику кількість теоретичних й експериментальних досліджень приготування, транспортування й спалювання такого виду палива [3]. Здебільшого ці дослідження присвячені визначенню реологічних параметрів палива [4] й особливостям його згоряння в казанах [5]. Це пов'язано, насамперед, з тим, що параметри вугілля відрізняються один від одного залежно від родовищ [6], що приводить до різних реологічних параметрів і різних особливостей згоряння.…”

Section: вступunclassified

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Rogovyi¹,

Neskorozhenyi²

2021

Bulletin of KhNAHU

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Problem. Pumping different fluids by hydraulic transport is associated with fast wear of the pump contact surfaces. The fluids being pumped are often non-Newtonian. The use of jet pumps for pumping is impractical due to low efficiency. Vortex chamber pumps may have higher efficiency when pumping non-Newtonian fluids, however, their operation on such fluids has not yet been studied. The aim of this work is to study the characteristics of the flow fields of a non-Newtonian fluid using the example of a Bingham fluid in the vortex chamber pump. Methodology. Predicting pump energy performance and determining flow fields for highly viscous fluids using CFD simulations enables advanced jet pumps to handle non-Newtonian fluids. Results. Modeling was carried out based on the numerical solution of the RANS equations with the SST turbulence model. To ensure the operability of the vortex chamber pump when pumping non-Newtonian fluid, with known rheological parameters of the mixture, it is necessary to select the required supply pressure for the active flow, and also to consider the issue of diluting the liquid with water to reduce the mixture viscosity and achieve the specified values of the pumping energy parameters. Originality. The hypothesis that the vortex chamber supercharger can operate on a hypothetical ideal fluid has been confirmed. In this case, the performance indicators of such a supercharger improve and tend to ideal. With an increase in plastic viscosity, the volumetric flow rate of the pumped fluid decreases, and at high values of the viscosity, an active flow is ejected through the axial channels. Practical value. Researchers can use the theoretical results of this work to design new devices for pumping other Bingham fluids, such as oil paint, resins, varnishes, swamp soils, and many others.

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Section: вступunclassified

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Rogovyi¹,

Neskorozhenyi²

2021

Bulletin of KhNAHU

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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%

“… 11 − 14 Extensive research has been conducted by scholars on the impact of concentration, temperature, particle size, and additives on coal slime viscosity. 15 − 18 Xiao et al 19 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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“…25 Chemical additive modifies the coal proprieties and stability, and different researchers used different additive for better stability. 34 Wang et al 21,35 used sodium methylene bisnaphthalenesulfonate as a surfactant and found that the organic (phenols, quinoline, and indole) and inorganic components (NH4+, Ca2+, and Na+) of coking wastewater enhanced adsorption capacity of additive but affected the slurry ability and stability of CWS. Mohapatra et al 26 studied the effect of with and without additive, triton X 100, on rheology of CWS at the concentration of 10-60% and found maximum reduction in viscosity at 50% concentration of CWS with 1.5% of additive.…”

Section: Introductionmentioning

confidence: 99%

“…Many other researchers utilized different additives including sodium polystyrene sulphonate and naphthalene sulphonate formaldehyde condensate, 27 grafted sulphonated acetone-formaldehyde resin and naphthalene sulfonate-formaldehyd (NSF), 28 amphiphilic copolymer, 29 cardanol-formaldehyde sulfonate, 30 condensate sulfonated alkali lignin polymer, 31 a novel humic acid-based polycarboxylic-type, 32 naphthalene sulphonate formaldehyde condensate and carboxymethyl cellulose, 33 and sodium tripolyphosphate. 34 Wang et al 21,35 used sodium methylene bisnaphthalenesulfonate as a surfactant and found that the organic (phenols, quinoline, and indole) and inorganic components (NH4+, Ca2+, and Na+) of coking wastewater enhanced adsorption capacity of additive but affected the slurry ability and stability of CWS. Wang et al 36 studied the adsorption of sodium methylene bisnaphthalenesulfonate and sodium lignosulfonate additive with coal, petroleum coke, and sludge and reported that the additive had better compatibility with sludge than coal and petroleum.…”

Section: Introductionmentioning

confidence: 99%

Rheological improvement in performance of low‐rank coal–water slurries using novel cost‐effective additives

Amin

Tahir

Saleem

et al. 2020

Asia-Pacific J Chem Eng

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Coal-water slurry (CWS) has been targeted as a promising fuel and an alternative to fuel oil. CWS has numerous advantages of low and convenient transportation and high solid content. Pakistan is going through a severe energy crisis and among the top 10 countries facing energy crises reported by the United Nations. Besides, Pakistan has become the top seventh country in coal reserves (i.e., 185 billion tones) after the discovery of huge lignite coal reserves in Thar, Sind province. Previous studies investigated the use of additives to enhance CWS properties at a low shear rate and its utilization accordingly. Particularly, the present work studied the high range of shear rate to improve the properties of CWS for transportation and combustion purposes. This study on the improvement in performance of rheology properties of CWS is conducted to improve the properties by cost-effective additives. The coal concentration varies from 20% to 60%, whereas runs were carried out with and without the costeffective additives. The results demonstrated that the coal slurry showed shearthinning property when viscosity was increased at high concentrations in the absence of additives. The addition of additive changed the rheological behavior from pseudoplastic to dilatant region. The presence of a high fraction of coal increased the apparent viscosity of CWS. The static stability test of all coal samples was performed using rod drop method at concentrations of 40% to 60%. The study found that stability was achieved earlier with a lower concentration of 40% as compared with higher concentrations of 50-60%. It is expected that this research would be helpful for the country facing adverse energy crises that badly affect the economy and other social aspects of human life. K E Y W O R D Scoal, coal-water slurry, viscosity, rheology, calcium lignosulfonate

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Rheological behavior of coal-water slurry using sodium tripolyphosphate as a dispersant

Cited by 11 publications

References 19 publications

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Rheological Properties of High Concentration Coal Slime

Rheological improvement in performance of low‐rank coal–water slurries using novel cost‐effective additives

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Rheological behavior of coal-water slurry using sodium tripolyphosphate as a ​dispersant

Cited by 11 publications

References 19 publications

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Flow fields of a non-Newtonian fluid in vortex chamber pumps

Rheological Properties of High Concentration Coal Slime

Rheological improvement in performance of low‐rank coal–water slurries using novel cost‐effective additives

Contact Info

Product

Resources

About

Rheological behavior of coal-water slurry using sodium tripolyphosphate as a dispersant