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Title: Minimization of moisture readsorption in dried coal samples
Authors: Karthikeyan, M. 
Keywords: Blending
Coal drying
Heat treatment
Moisture content
Spontaneous combustion
Issue Date: Jul-2008
Citation: Karthikeyan, M. (2008-07). Minimization of moisture readsorption in dried coal samples. Drying Technology 26 (7) : 948-955. ScholarBank@NUS Repository.
Abstract: Low-rank coals csonstitute a major energy source for the future as reserves of such high-moisture coals around the world are vast. Currently they are considered undesirable since high moisture content entails high transportation costs, potential safety hazards in transportation and storage, and the low thermal efficiency obtained in combustion of such coals. Furthermore, low-moisture-content coal is needed for the various coal pyrolysis, gasification developed. Hence, various upgrading processes have been developed to reduce the moisture content. Moisture readsorption and spontaneous combustion are important issues in coal upgrading processes. This article discusses results of laboratory experiments conducted to study the options for minimization of readsorption of moisture after drying of selected coal samples. Results suggest that there is little benefit in drying low-rank coal at high temperatures. It was found that the higher the amount of bitumen used for coating, the lower is the readsorption of moisture by dried coal. Also, mixing high-temperature-dried coal with wet coal in appropriate proportion can yield reduced moisture content as the sensible heat in the hot coal is utilized for evaporation.
Source Title: Drying Technology
ISSN: 07373937
DOI: 10.1080/07373930802142846
Appears in Collections:Staff Publications

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