Zhengzhou Dingli Drying equipment o., ltd is the first study to dry brown coal drying professional equipment manufacturers, lignite is an important energy and chemical raw materials, but because of high moisture lignite (20% -40%), low calorific value (2700 kcal or so), spontaneous combustion etc. characteristics, resulting in lower selling prices, sales radius is limited, so more and more development and utilization of lignite domestic and foreign governments and research institutions attention. Dingli company product of Lignite drying machine ,is also used for drying coal slurry, on the condition of ensuring the lignite quality fixed , adopt low-temperature and  four grades drying process, to evaporate the moisture of lignite to lower than 13%.The first drying area in the high humidity status ,remove most of moisture through 400 ℃, to make sure the chemical composition of the lignite no change and no easy to burn; The temperature of the second area is 300℃, to remove the moisture by middle temperature including air, to ensure lignite no coking; The temperature of the third area is 120℃-210℃, ,use the crushing device in the rotary body, repeat crushing, scatter the material, down-flow drying; The forth drying area is high exhausting area, temperature is 60℃-80℃,remove moisture by low temperature and hot air which produced through the inducing air system .