... (20% -40%), low calorific value (2700 kcal or so), spontaneous combustion etc. characteristics, resulting in lower selling prices, sales radius is ... of lignite lower than 13%.The first drying area in the high humidity status ,remove most of moisture through ... and energy and reducing loss of lignite. Improve the calorific value of brown coal, desulfurization, reduce volatile.(2), investment, small ...