Sludge discIntroduction to paddle dryer
The disc blade dryer uses steam (or heat transfer oil) as the heating medium, and the shaft end is equipped with a rotating joint for introducing and exporting the heat medium. The heating medium enters the inner cavity of the dryer rotor and heats the rotor to conduct heating and dry the sludge. At the same time, a heating medium is also introduced into the jacket of the dryer cylinder to heat and dry the sludge material, evaporating the moisture in the sludge.
The dried wet sludge raw material is continuously fed into the disc blade dryer by the belt feeder, and the sludge is flipped and stirred by the rotation of the rotor, fully heating the material and evaporating the moisture contained in the sludge. At the same time, the material is pushed towards the discharge port by the pusher as the rotor rotates, and continues to stir during transportation, causing the water seeping out of the material to continue evaporating. The qualified products that have been processed and dried evenly are discharged from the discharge outlet.
The speed range of the rotor can be adjusted between 0-7rpm to control the dryness of the material and adapt to different process conditions on site.
Key technological innovation points and improved design
(1) Introducing foreign disc blade technology, improving design, and successfully applying it in large-scale production;
(2) Design and overall machining of bearing seat fittings, and installation of cooling devices;
(3) The cylinder, bearings, and shaft are all designed for thermal expansion and free sliding. The overall framework of the main engine is designed to prevent deformation of the equipment, making it easy to transport and operate;
(4) The overall reinforced design ensures better strength and service life;
(5) The blade blades are welded as a disc, which has better strength and is less prone to wear and leakage; Scraper plates can be added according to the material status, with 4 to 8 plates per disc for better flipping performance. They automatically clean the sludge on the shaft disc to ensure heat transfer efficiency;
(6) The structural design is more compact, and a single unit can be designed with a large blade dryer with an area of ≤ 250m2;
(7) Samsung gear transmission structure design ensures more balanced operation and reduces swing and tension issues caused by chain transmission;
(8) The unique processing and assembly technology of the Navigation Drying Engineering Company ensures better concentricity of the equipment and superior sealing performance at both ends;
(9) According to different situations, wastewater recovery devices, odor water recovery devices, odor exhaust gas treatment systems, etc. can be designed;
(10) The hot medium enters the rotary joint of the shaft in the form of steam entering one end and condensate exiting the other end. This process solves the problem of thermal short circuit of the blades at the transmission end.

sludgeClass materialsdiscCharacteristics of blade dryer
1. The rotor and cylinder of the dryer are designed to be compact and reasonable, with low space occupancy. The dryer has a large heat transfer area per unit volume and fast drying speed; Having the largest heat exchange surface within the unit effective volume, the equipment size can be reduced, and the processing time can be shortened;
2. The shaft rotates uniformly, the material is stirred evenly, the drying force is uniform, and the product particle size is uniform;
3. By adjusting the speed, process (intermittent or continuous), and drying time, the adjustable material drying effect can achieve different final moisture contents, such as reducing the sludge moisture content from around 80% to 40%, 30%, 20%, 10%, and 5%, etc;
4. High thermal efficiency, good mixing and stir frying effect, with 4 to 8 plates per disc for better stir frying performance, and automatic cleaning function for dual axis rotating discs;
5. The movement regularity of dry particles is strong, and the wear on the components is small, making it suitable for sludge material drying equipment.
6. The disc dryer has high unit heat exchange area efficiency, lower power consumption, low operating costs, low operating resistance, and minimal equipment vibration;
7. The two axis embedding method can form a thin layer of material with animal material on the blade, achieving the effect of thin layer heat transfer;
8. The relative rotation of the two shafts and the action of the scraper can scrape off the maximum amount of adhesive material stuck to the rotor, keeping the heat exchange surface clean and automatically cleaning, ensuring stable heat exchange effect;
9. Wide range of material handling It can be widely used for particles, powders, and viscous materials. It can dry materials with high or low moisture content, and can be operated continuously or intermittently. It is a highly applicable and energy-saving drying equipment.
10. Low energy consumption:
The spindle speed is low, and the material conveying system requires low power and low electricity consumption.
Drying with conductive heat results in high thermal efficiency and low energy consumption. 1.0~1.2 steam/kg/water.