Lignite dryer(brown dryer line) line, as one type of horizontal rotary drying machine, is a special drying machine designed to adopt to different types of coals with varying characteristics, including raw coal, middling, cleaned coal, coal mud, peat coal, tail coal, flotation coal and lignite, etc. Lignite dryer line has been widely used in companies and institutes with high coal consumption, such as large coal fields, coal mines, coal cleaning plants, coal preparation plants, power plants and steel mills.