ReviewA review on water in low rank coals: The existence, interaction with coal structure and effects on coal utilization
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Highlights
► Provides a comprehensive overview on the fundamental understanding of water in brown coal and lignite ► Applications of techniques such as NMR, DSC and FTIR in determination and quantification of types of water and coal structures ► Water–coal interactions are very complicated and water exists in low-rank coals in different forms. ► The gel-like structure of brown coal shrinks in response to loss of moisture. ► The change in chemical nature of the coal surface is predominantly due to the destruction of the oxygen-containing polar functional groups
Keywords
Low rank coals
Coal–water interaction
Forms of water
Drying
Thermal treatment
Coal structure
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