The hollow paddle dryer is an indirect heating low-speed stirring dryer with two or four hollow rotating shafts inside the equipment. The fan-shaped wedge-shaped hollow blades are densely arranged in parallel on the hollow shaft. The structure is designed and clever. The shaft rotates relatively, and adopts the principle and structure of the same angular velocity and different linear velocity, which cleverly realizes the self-cleaning effect of the sludge on the shaft, which can prevent the occurrence of the phenomenon of “holding the shaft” during the operation of the sludge. Sludge drying. During the drying process, the sludge is made to flow rapidly through the "colloid phase region". At the same time, the ingenious structure makes the sludge reach a bidirectional shearing state during the drying process.
The dried sludge is continuously and quantitatively fed into the feed port of the dryer through a screw feeder. After the sludge enters the human body, the sludge is rotated and stirred by the rotation of the paddle, and the heating interface is continuously updated to contact the main body and the blades, and fully heated to evaporate the surface water contained in the sludge. At the same time, the sludge is conveyed to the discharge port in a spiral trajectory with the rotation of the blade shaft.
During the conveying process, the sludge is continuously stirred, so that the water seeping out from the sludge continues to evaporate. Dry and qualified products are discharged from the discharge port. The jacketed shell structure is adopted, so that the sludge is evenly heated in all the interfaces in the machine, the shaft rotates, the sludge will not roll in the equipment, and the heating surface will be continuously refurbished. As a result, the steaming efficiency of the sludge hollow paddle dryer is greatly improved, which not only achieves the purpose of sludge drying, but also realizes the low-cost operation of the entire device.
