With the enhancement of national economic strength and the improvement of national environmental awareness, the urban sewage treatment industry has developed rapidly, and the production of urban sludge is increasing day by day. The disposal and development of sludge are increasingly concerned by people. The drying treatment of sludge makes it possible to use it for agricultural purposes, as fuel, incineration, and even to reduce landfill sites.

Working principle

Paddle dryer is a horizontal stirring dryer mainly based on conduction. The main structure is a W-shaped shell with a jacket, which is equipped with paired hollow low-speed rotating hollow shafts. Several stirring blades are welded on the shafts, and both the jacket and the hollow stirring blades are connected to a heat carrier. The two heating surfaces simultaneously heat the material. Hot air is usually sent in from the middle of the desiccant, passes through the surface of the material layer in a stirred state, and is discharged from the other side.

Main features of municipal sludge dryer:

1. The retention time of materials can be adjusted, which can handle high moisture content materials and also obtain extremely low moisture content materials;

2. Typical conduction drying method, energy-saving, high conductivity coefficient, and high thermal efficiency;

3. As all the required heat is supplied by hollow blades and jackets, in order to reduce exhaust humidity and supplement a small amount of hot air, dust entrainment is low, exhaust gas is easy to treat, and no auxiliary equipment such as dust removal is required;

4. The blade has self-cleaning ability. The blades rotate in opposite directions, and the two inclined surfaces of the blades repeatedly stir, compress, relax, and push the material, giving the blade surface a unique self-cleaning ability. The heating surface is constantly updated, and the heat transfer coefficient of the blade dryer is higher than any other conductive drying method.

Saint Wanda produces high-quality and energy-saving municipal sludge dryers, providing advanced manufacturing processes. Welcome to call us for negotiation and purchase.

product details
The complete set of equipment for centrifugal dewatering of sludge (sludge concentration and dewatering equipment) is an important equipment in municipal sludge treatment, sludge treatment in tap water production processes, and municipal wastewater treatment projects. It has the integrated treatment function of sludge dewatering and sludge concentration dewatering. Internationally, a fully enclosed continuous operation large aspect ratio horizontal spiral discharge settling centrifuge is generally used as the main machine for sludge dewatering. Nowadays, sludge paddle blade dryers are more suitable for integrated drying and dewatering of sludge.

Advantages that the device does not have:
1. Fully enclosed operation, clean and pollution-free on-site;
2. Low usage of coagulants and cleaning water, resulting in low daily operating costs;
3. The equipment layout is compact and occupies a small area, which can significantly reduce land acquisition and infrastructure investment.
The sludge concentration and dewatering integrated machine manufactured by our company has a long main body and slow rotation speed. The entire processing of sludge cutting, spiral feeding, spiral discharging, transportation, flocculant addition, and monitoring of the entire system operation are all implemented by a PLC+LCD control system. For users, this device, as a fully automated complete set of operating units, is an ideal turnkey project.

The process flow diagram of the complete set of sludge dewatering equipment manufactured by our company is as follows:

Working principle of municipal sludge dryer:

Wedge shaped hollow blades are densely arranged on the hollow shaft, and the heat medium heat transfer oil flows through the blades through the hollow shaft, with a large heat transfer area per unit effective volume. The heat transfer medium flows through the shell jacket and 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.
At the same time as the jacket is heated by the heat medium, the upper part of the discharge port is simultaneously dehumidified, which greatly increases the drying strength of the equipment. The evaporated water is carried out of the dryer by the dehumidification fan.
Equipment characteristics:
1. Low energy consumption of sludge dryer: Due to indirect heating, there is no large amount of air carried away to remove heat, and the outer wall of the dryer is also equipped with insulation layer, so the heat loss is very small.
2. The sludge paddle dryer system has low cost: it has a huge heat transfer surface per unit effective volume, which shortens the processing time. The device size has decreased, reducing the footprint.
3. Wide range of material processing: Using different heat media, it can handle both thermosensitive materials and materials that require high-temperature treatment.
4. Low environmental pollution: carrying very little air and carrying very little dust material.
5. Low operating costs.
6. Stable operation: Due to the special compression expansion stirring effect of the wedge-shaped blade, the material particles are fully in contact with the heat transfer area. In the axial range, the temperature, humidity, mixing temperature, and gradient of the material are very small, thereby ensuring the stability of the process.