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The dry wet material is sent to the hopper by belt conveyor or bucket elevator, and then enters the feeding end through the feeding pipe through the feeder of the hopper. The inclination of the feeding pipe shall be greater than the natural inclination of the material, so that the material can flow into the cooler smoothly.

The cooler cylinder is a rotating cylinder slightly inclined to the horizontal line. The material is added from the higher end, and the heat carrier flows out from the lower end and contacts the material in countercurrent. There are also cases where the heat carrier flows into the cylinder together with the material. With the rotation of the cylinder, the material moves to the bottom end under the action of gravity.

When the wet material moves forward in the cylinder, it is directly or indirectly heated by the heat carrier to cool the hot material, and then sent out through the belt conveyor or screw conveyor at the mountain material end. A reading board is installed on the inner wall of the cylinder, which is used to pick up and remove the materials, so as to increase the contact surface between the materials and the air flow, so as to improve the cooling rate and promote the advancement of the materials. The cooling body is generally divided into cold air, etc.

After the heat carrier passes through the cooler, the cyclone dust collector is generally required to capture the materials carried in the gas. If it is necessary to further reduce the dust content of tail gas, it shall be discharged after passing through bag filter or wet dust collector.