Hot water drying and briquetting of lignites

TL;DRAbstract

The objective of this research was to characterize the effects of hot-water drying on a Montana lignite and to see if this drying process changes the briquetting ability of the coal.A Savage lignite was hot-water-dried at temperatures between 200C and 300C in a cold-charge autoclave.Hot and cold off-gases of the drying processes were tested for their contents.The dried coals were tested for their moisture content, ash content, gross heating value and ultimate elemental contents.Briquets were made from the raw lignite and the dried coals using 5 different binders in varying concentrations.Water was.included in the briquetting mixture in some trials.All.briquets were tested for compressive strength.The off-gases mainly consisted of CO2 and nitrogen.With increasing drying temperature the dried coals exhibited a higher carbon content, lower oxygen content and a higher heating value than did the raw lignite.The moisture content of the lignite decreased with increasing drying temperature.An

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