Rheological and stability behavior of coal–water slurry: the impact of pH with dual-impeller configurations.
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| Title: | Rheological and stability behavior of coal–water slurry: the impact of pH with dual-impeller configurations. |
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| Authors: | J, Purushottam Karthik1 (AUTHOR) chandrakalachari@gmail.com, C, Tara Sasanka1 (AUTHOR), Muddu, A.1 (AUTHOR), Raguraman, C. M.2 (AUTHOR), Kumar, D. Sameer3 (AUTHOR) |
| Source: | International Journal of Coal Preparation & Utilization. 2026, Vol. 46 Issue 6, p1636-1653. 18p. |
| Subject Terms: | *pH effect, *Impellers, *Rheology, *Rotors, *Stability (Mechanics), *Slurry |
| Abstract: | This study examines the effect of pH on the slurrying properties of coal–water slurry (CWS), focusing on concentration, rheological behavior, and stability. Experiments were conducted using a dual-impeller system under two configurations: (1) a propeller impeller at the lower side and (2) a Rushton impeller at the lower side. The pH range varied from 7.22 to 8.64. The results indicate that impeller speed (N) and the clearance height-to-tank diameter ratio (C/T) significantly influence the CWS properties. However, the slurry height-to-tank diameter ratio (Z/T) and the distance between the two impellers (S) showed minimal effect. For the propeller impeller at the lower side, the pH ranged from 7.22 to 8.16, while for the Rushton impeller at the lower side, it varied from 8.10 to 8.55. The Rushton impeller at the lower side produced a more stable and concentrated slurry with a higher pH, making it more suitable for coal gasification. The impact of coal particle size on pH was also analyzed under optimal equipment conditions. Additionally, uncertainty analysis was performed using regression models, confirming that the pH range of 7 to 9 is ideal for effective slurry transport. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | This study examines the effect of pH on the slurrying properties of coal–water slurry (CWS), focusing on concentration, rheological behavior, and stability. Experiments were conducted using a dual-impeller system under two configurations: (1) a propeller impeller at the lower side and (2) a Rushton impeller at the lower side. The pH range varied from 7.22 to 8.64. The results indicate that impeller speed (N) and the clearance height-to-tank diameter ratio (C/T) significantly influence the CWS properties. However, the slurry height-to-tank diameter ratio (Z/T) and the distance between the two impellers (S) showed minimal effect. For the propeller impeller at the lower side, the pH ranged from 7.22 to 8.16, while for the Rushton impeller at the lower side, it varied from 8.10 to 8.55. The Rushton impeller at the lower side produced a more stable and concentrated slurry with a higher pH, making it more suitable for coal gasification. The impact of coal particle size on pH was also analyzed under optimal equipment conditions. Additionally, uncertainty analysis was performed using regression models, confirming that the pH range of 7 to 9 is ideal for effective slurry transport. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19392699 |
| DOI: | 10.1080/19392699.2025.2505453 |
