For the dryer equipment is concerned, the long-term drying production, there will be some water vapor from the chimneys, some will remain in the chimney, a chimney is likely to cause long-term rust. In order to extend the life of rotary dryer chimney must every other period of time to rust. The main reason of corrosion rotary dryer chimney occurs: (1) the production process in the chimney, general secondary normal brushing rust; the dryer flue gas temperature at 60 ~ 150 ℃; new chimney use soon, anti- rust paint quickly produce bubbles and off, the protective layer is damaged, accelerate corrosion chimney; (2) Dryer corrosive fumes, coupled with the dryer filter outlet pipe and chimney has no insulation in the winter, smoke it easy condensation in the chimney, chimney wall even dripping phenomenon, exacerbated by the chimney corrosion; for the measure and effect rotary dryer chimney corrosion action: (1) rust treatment, use of high temperature (400 ℃) anti-rust paint Brushing 2 times. After the end of the installation at the site welding, weld high temperature and then brushing rust; (2) the round instead of rectangular chimney stack, the four corners of a rectangle with a 30mm × 30mm angle iron reinforcement, chimney pipes are flange connection; (3) since put into operation, the chimney outer wall paint maintained as new; viewed from the observation wells, chimney wall paint is also good, expects its life of more than 36 months.