The invention discloses a three-dimensional dynamic turn-back flow preheating,
drying and calcining
system. A first preheater is arranged on the side edge of a first
elevator, a second preheater is arranged on the side edge of a second
elevator, a first calcinator is arranged on the side edge of a third
elevator, a second calcinator is arranged on the side edge of a fourth elevator, a first cooleris arranged on the side edge of a fifth elevator, a second cooler is arranged on the side edge of a sixth elevator, a feeding port of the first elevator is connected to a stock bin through an
auger,a first high-temperature heating source is arranged on a middle
machine body of the first calcinator, a second
tail gas hot air outlet is formed in the rear end of the first calcinator, a second high-temperature heating source is arranged on a middle
machine body of the second calcinator, and a third
tail gas hot air outlet is formed in the rear end of the second calcinator. A three-dimensional inclined plate turn-back flowing process is adopted, so that the preheating,
drying and calcining time of the materials can be ensured. Meanwhile, no power exists in the turn-back flow process, the natural flow process can guarantee uniform material
calcination, the production cost is saved, and automatic production can be achieved.