Special paddle dryer for sludge dryer
1.The status quo of the environment
Many chemical companies pull the sludge after belt filter press outside the factory and dump it, polluting the surrounding environment. Now the state prohibits the sludge from being poured out. Therefore, companies need to dry the sludge and burn it or use it for building bricks. . Therefore, sludge drying will become an engineering project with great potential in the future. The hollow blade dryer developed by our company is especially suitable for papermaking sludge, domestic sludge, leather sludge, municipal sludge, printing and dyeing sludge, PTA sludge, electroplating sewage sludge, etc.
2.Overview of sludge dryer
The sludge special dryer produced by our company is a kind of low-speed agitation in which a hollow stirring blade is set inside the equipment, and a heat carrier is passed through the blades, so that the sludge and the hot surface of the blades are fully contacted, and the sludge is dried at a low speed. Dryer. The equipment can indirectly heat or cool paste, granular, powder, and slurry materials, and can complete unit operations such as drying, cooling, heating, sterilization, reaction, and low-temperature calcination. The special wedge-shaped stirring heat transfer blade in the equipment has high heat transfer efficiency and self-cleaning function of the heat transfer surface.
3.The principle of Special paddle dryer for sludge dryer
Wedge-shaped hollow blades are densely arranged on the hollow shaft, and the heat medium flows through the blades through the hollow shaft. The heat transfer area in the unit effective volume is large, and the temperature of the heating medium ranges from 40°C to 320°C. It can be steam, hot water or heat transfer oil. The heat transfer medium flows through the shell jacket and the hollow stirring shaft through the rotary joint. The hollow stirring shaft has different internal structures according to the type of heat medium to ensure the best heat transfer effect. While the blades and jacket are heated by steam, the upper part of the discharge port is simultaneously fed with heated dry air for further drying, which greatly increases the drying strength of the equipment. The evaporated moisture is taken out of the dryer by the exhaust gas, filtered by a bag filter, and the dried fine powder is recovered. The moist air is dedusted by water and discharged out of the outdoor by an induced draft fan.
4.The characteristics of Special paddle dryer for sludge dryer
①The blade dryer has low energy consumption: due to indirect heating, there is no large amount of air to take away the heat, and the outer wall of the dryer is provided with an insulation layer. For the slurry material, 1.2kg of water vapor is needed to evaporate 1kg of water. ②The cost of the blade dryer system is low: the unit effective volume has a huge heat transfer surface, which shortens the processing time and reduces the size of the equipment. This greatly reduces the building area and building space. ③Wide range of processing materials: using different media, it can handle both heat-sensitive materials and high-temperature processed materials. Commonly used media are: water vapor, thermal oil, hot water, cooling water, etc. It can be operated continuously or intermittently, and can be used in many fields. ④Environmental pollution is small: the amount of air carried is small, and the entrainment of dust materials is small. For contaminated materials or working conditions where solvents need to be recovered, a closed loop can be used. ⑤Low operating cost: The equipment operates normally, only 1 person/day. Low speed mixing and reasonable structure. The amount of wear is small, and the maintenance cost is very low. ⑥ Stable operation: Due to the special compression-expansion stirring effect of the wedge-shaped blades, the material particles are in contact with the heat transfer surface. In the axial interval, the temperature, humidity, and mixing temperature gradient of the material are small, thereby ensuring the process stability.
Special paddle dryer for sludge dryer
china Special paddle dryer for sludge dryer