Abstract
Excessive coal moisture leads to a lower heating value and power plant efficiency, and increased transportation costs. Therefore, coal stockpile management and moisture control are particularly important in regions with heavy precipitation. This paper and Part 2 address factors influencing moisture retention and migration in coal stockpiles. Part 1 of this paper series simulates phenomena of runoff, infiltration, and drainage in a stockpile after a rainfall event. Part 2 reports the effect of coal particle size and climate conditions on the rate and depth of moisture evaporation process within a coal stockpile. To perform this study, two coal samples were collected from the Witbank mine in South Africa. The results of the present study showed that smaller interparticulate void spaces because of the compaction or fines particles (−0.5 mm fraction) inhibited infiltration, leading to increased runoff volume. An increase stockpile slope increased the amount of runoff due to coal–water contact time reduction. The ability of heavy rainfall to destroy near-surface structures (erosion) happened more readily at stockpiles with high slopes and high fine content. The fine content significantly influenced the dewatering efficiency of drainage. Coals with higher ash contents had stronger moisture retention ability than that of other coals even though coals with low ash contents had a high fine content. This was ascribed to the contribution of the clay minerals, such as kaolinite, in the high ash coal. The results of this paper can be used for the effective management of coal stockpiles to prevent excessive moisture in stockpiles for the best possible utilization of coal in power plants.
Recommended Citation
Q. P. Campbell et al., "Coal Moisture Variations in Response to Rainfall Event in Mines and Coal-fired Power Plant Stockpiles—part 1: Runoff, Infiltration, and Drainage," Minerals, vol. 11, no. 12, article no. 1365, MDPI, Dec 2021.
The definitive version is available at https://doi.org/10.3390/min11121365
Department(s)
Mining Engineering
Publication Status
Open Access
Keywords and Phrases
Coal stockpile; Gravity drainage; Infiltration; Moisture; Rainfall; Runoff; Simulation
International Standard Serial Number (ISSN)
2075-163X
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2024 The Authors, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Dec 2021
Comments
National Research Foundation, Grant TP14081289982