Drum dryers with heat exchanger. Productivity (initial humidity 45-50%, final 12-14%), kg/hour up to 1000/1500/2000/3000 Inside the dryer there is a special heat exchanger connected to each other by a grid, thanks to which the heat exchanger design is rigid and stable. The wet material enters the dryer from the top and passes through the entire heat exchanger to the bottom of the drum. The material passes through the heat exchanger pipes without interruption, and with constant contact with the pipes it heats up. Special coils take appropriate portions of the material and distribute it between the pipes. This system resembles an inverted air conditioner that does not require much electricity to rotate