颗粒分布对高浓度水煤浆流变性能的影响

doi:10.11799/ce201503040

Abstract

Abstract: Three coal powders with different mean volume diameters (81.30μm, 14.62μm and 6.07μm) were mixed in different proportions to prepare high concentration coal water slurry with various particle size distributions. Dinger model was used to evaluate the particle size distributions before and after the gradation. The effect of particle size distribution on the rheological properties of high-concentration coal water slurry was investigated. The results show that the coal particle size distribution is optimized and closer to theoretical model. In the higher concentration, the slurry show a transition from shear-thinning to shear-thickening rheology characteristic as the fraction of fine particle in the slurry increasing, presenting pseudoplastic, Bingham and dilatant flow type in sequence. The Fitting equations are obtained, the reason of the transition of rheology behavior was analyzed using Meng Lingjie’s rheological mechanism. The ratio of optimum rheological properties of high-concentration slurry was obtained.

Key words: particle size distribution, coal water slurry, rheological model formulas

CLC Number:

TQ536

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URL: http://www.coale.com.cn/EN/10.11799/ce201503040

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References

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Effect of particle size distribution on the rheology behavior of high-concentration coal water slurry

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