Study of rheological parameters due to coal particle size change in pipeline transported coal slurry.

Sci Rep

Shandong Gold Mining Co. Ltd. Xincheng Gold Mine, Laizhou Shandong, 261438, China.

Published: November 2024

AI Article Synopsis

  • - The article introduces a method using abrasion equilibrium equations to optimize the hydrodynamic conveying of coarse-grained coal slurries by integrating experimental data and theoretical models.
  • - It highlights that as conveying time increases, the content of coarse particles decreases while fine particles increase and slurry viscosity rises, with a slow rate of increase over time.
  • - Additionally, the study presents a viscosity prediction formula using the Herschel-Bulkley fluid model, achieving a low deviation from experimental values and identifying optimal conditions for slurry concentration and particle blending.

Article Abstract

This article proposes using abrasion equilibrium equations for refining coarse-grained coal slurry hydrodynamic conveying, combining experimental data and theoretical analysis. It presents a particle refinement solution model and a viscosity prediction formula for mixed coarse and fine coal samples. Experimental data indicate that prolonged conveying time decreases coarse particle content and increases fine particles (< 0.074 mm), with a tendency for slurry viscosity to rise, though the rate of increase slows. Comparing predicted and measured particle refinement values showed a maximum deviation of 10% for 30 and 50-minute conveying times. Using the Herschel-Bulkley fluid model for viscosity prediction post-grading, verified with experimental data, the minimum viscosity value is observed at a 58% slurry concentration with varying coarse and fine coal ratios. The deviation between predicted and measured viscosity values is 5.23%, providing a formula for the viscosity reduction effect of blending.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11599778PMC
http://dx.doi.org/10.1038/s41598-024-79696-2DOI Listing

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