Evaluation And Modeling Of The Effect Of The Slurry Composition, Dispersants, And Stirring On The Rheology Of Bituminous Coal Water Slurry Using Novel Definitive Screening Design

Abstract

The effects of six factors—dry solids content; X1 ((Formula presented.) (Formula presented.) and (Formula presented.)), the percentage of fine particles; X2 ((Formula presented.) (Formula presented.) and (Formula presented.)), the concentration of the anionic mixture; X3 ((Formula presented.) (Formula presented.) and (Formula presented.)), the concentration of the nonionic mixture; X4 ((Formula presented.) (Formula presented.) and (Formula presented.)), the stirring time; X5 ((Formula presented.) and (Formula presented.)), and the stirring speed; X6 ((Formula presented.) and (Formula presented.)) on the apparent viscosity, the yield stress, and the flow behavior index (n) of bimodal coal-water slurries (CWSs) were investigated using a novel definitive screening design (DSD). The dry solids content was found to have the most significant impact on the rheology of the CWSs wherein its increase augments the apparent viscosity and the yield stress but reduces the flow behavior index (n) due to the increase in the frictional forces between the coal particles with the increase in the concentration of the solids. The same frictional forces, which control the spacing between the particles are substantially influenced by the particle size distribution. In contrast to the concentration of the nonionic mixture of surfactants, the concentration of the mixture of anionic surfactants, which consists of Sodium tri-polyphosphate (STPP), Polyacrylic acid (PAA), and Sodium silicate (SS), considerably reduced the apparent viscosity and the yield stress of the CWSs, regardless of the concentration of the solids and their particles size distribution.

Department(s)

Chemical and Biochemical Engineering

Keywords and Phrases

Coal water slurry; definitive screening design; flow behavior; slurry rheology; surfactants

International Standard Serial Number (ISSN)

1532-2351; 0193-2691

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Taylor and Francis Group; Taylor and Francis, All rights reserved.

Publication Date

01 Jan 2025

Link to Full Text

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