Hollow blade dryer compared to disc sludge dryer:
There are currently many types of equipment for sludge drying, such as hollow blade dryers, disc sludge dryers, rake dryers, heat pump dryers, etc. For comparison between hollow blade dryers and disc sludge dryers, Binda Drying has made a comparison for your reference! If there is anything unclear, please feel free to have a technical exchange with us!
1. Both the hollow blade dryer and the disc sludge dryer have been put into operation for a long time and are relatively mature;
2. The working principle is very similar. The shell is hollow with a jacket, a hollow shaft, and hollow blades (discs), which belong to pressure vessels and are all indirect heating and drying equipment;
3. Both jacket heating can be designed as coil or honeycomb type
4. During the implementation of the project, the external access requirements are basically the same, except for slight differences in the external dimensions of the equipment, which can be replaced with each other in the sludge drying project;
5. Adaptability of viscous sludge.
The blade shaped blade has a cutting effect on sludge, so this equipment has a certain self-cleaning function for sludge with low viscosity. However, for sludge with strong viscosity, due to the uneven cross-section of the blade, a scraper cannot be used, which will cause sludge to adhere to the drying surface and affect the drying effect and equipment drying capacity; The disc of the disc dryer has no cutting force on the sludge, but it is equipped with a scraper blade, which can fully adapt to high viscosity sludge. The maintenance and even replacement of the scraper blade are convenient and cost-effective;
6. Wear resistance and safety. Due to the high sediment content in sludge, equipment selection should fully consider wear resistance. The hollow cylindrical blade of the blade dryer is a pressure vessel with an internal pressure of 0.3-1.3MP and is a structural component of the equipment. Due to its cutting effect on sludge, running for a period of time will inevitably lead to wear and tear, resulting in leakage of thermal oil or steam, thereby increasing equipment maintenance costs, reducing operating time and service life; As a pressure vessel, the disc of the disc dryer is also a structural component with an internal pressure of 0.3-1.3MP. The disc has no cutting force on the sludge, so it is not easy to wear. The pushing and stirring of the sludge rely on the action of the pushing mixer (small steel plate, fixed to the edge of the disc by bolts, non structural component) at the edge of the disc, which is easy to replace and has low maintenance costs;
7. The processing capacity of a single device mainly depends on the heat exchange area of the equipment. Blade dryers can generally only achieve a heat exchange area of 300M3, making it difficult to scale up the equipment; The disc dryer can achieve a heat exchange area of 400-500M3, with a larger processing capacity per device;
8. Paddle type generally adopts double axis or four axis, with complex structure; The disc dryer is a single shaft, with a simple structure and low failure rate and maintenance costs;
9. The blade dryer has high operating resistance, while the disc dryer has low operating resistance. The power consumption per unit heat exchange area of the disc dryer is about 1/3 to 1/4 of that of the blade dryer, resulting in lower power consumption and lower operating costs;
