| Customization: | Available |
|---|---|
| After-sales Service: | Online Technical Supporting |
| Warranty: | 1 Year |
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Introduction
Thermal drying is an intermediate sludge treatment process that consists of evaporating the water in the sludge. It significantly reduces the volume and weight of the sludge so that it is easier to recover.
The hollow paddle dryer is an indirect heating type composed of the casing with a jacket and shaft with a disc that contains steam or other heating media, Hollow paddle dryer (also called disc dryer) can dry all kinds of animal waste in an atmosphere controlled environment with multipoint thermal control, such as poultry entrails, municipal sludge, textile sludge, catering sludge, chemical sludge, etc.
The paddle (discs ) cover 80% of the total heating surface.
Compared to the other indirect heating dryer, the disc has a compact design and high thermal efficiency.
1. JYG sludge dryer has low energy consumption: due to indirect heating, it does not carry a large amount of air to take away the heat, and the outer wall of the dryer is provided with a thermal insulation layer.
2. JYG sludge dryer has low use cost: it has a huge heat transfer surface per unit effective volume, which shortens the treatment time, reduces the size of the equipment, and greatly reduces the building area and building space.
3. Wide range of materials to be treated: different thermal media are used to treat both heat-sensitive materials and materials requiring high-temperature treatment. Common media include steam, heat transfer oil, hot water, cooling water, etc., which can be operated continuously or intermittently. It can be used in many fields.
4. Small environmental pollution: vacuum or small air volume is used to take away the moisture in the material. The entrainment of dust and material is very small, and the evaporation of the material solvent is very small, which is convenient for treatment. Closed-circuit circulation can be adopted for contaminated materials or working conditions requiring solvent recovery.
5. Low operation cost: low-speed mixing and reasonable structure, small wear, and low maintenance cost.
6. Stable operation: due to the special compression expansion mixing function of the wedge-shaped blade, the material particles are in full contact with the heat transfer surface. In the axial range, the temperature, humidity, and mixing gradient of the material are very small, so as to ensure the stability of the process.
Paddle dryer (vacuum disc dryer) has been successfully used in food, chemical, petrochemical, dye, industrial sludge, and other fields.
The characteristics of heat transfer, cooling, and stirring of the equipment enable it to complete the following unit operations: combustion (low temperature), cooling, drying (solvent recovery), heating (melting), reaction, and sterilization.
At the same time, the stirring blade is the heat transfer surface, which increases the heat transfer area per unit effective volume and shortens the treatment time. The heat transfer surface of the wedge-shaped blade also has the function of self-cleaning.
Compression - expansion mixing function makes the materials mix evenly. The material moves in a "piston flow" along the axial direction. In the axial range, the gradient of temperature, humidity, and mixing degree of the material is very small. Using heat transfer oil or steam as a thermal medium, the paddle dryer can complete low-temperature combustion.
For example, the combustion of calcium sulfate dihydrate (Ca2SO4 · 2H2O) is transformed into calcium sulfate hemihydrate (Ca2SO4 · 1 / 22h2o). Sodium bicarbonate (NaHCO3) is converted into soda ash (na2hco3) by calcination. The cooling medium, such as water and cooling brine, can be used for cooling. For example, the paddle-type soda cooler used in the soda ash industry replaces the old air-cooled soda cooler, saving energy and tail gas treatment equipment and reducing operating costs. Drying, the main function of the equipment does not to use hot air, so that solvent recovery, energy consumption, and environmental control are in an ideal state of easy treatment. It is especially suitable for solvent recovery, flammable, and easily oxidized heat-sensitive materials. It has been widely used in fine chemical, petrochemical, and dye industries. In the axial section, the uniformity of temperature, humidity, and mixing degree makes the equipment can be used to heat or melt or react with some solid materials. It has been successfully used in compound fertilizer and modified starch industries. The paddle dryer can be used to sterilize food and flour. The large heating area in the unit effective volume can quickly heat the material to the sterilization temperature, avoiding the change of material quality caused by long-time heating.
1. The paddle dryer has low energy consumption: due to indirect heating, it does not carry a large amount of air and take away heat. The outer wall of the dryer is provided with an insulating layer. For slurry materials, it only needs a small amount of heat to evaporate 1kg of water.
2. The cost of the paddle dryer system is low: there is a huge heat transfer surface in the unit effective volume, which shortens the processing time. Due to the smaller size of the equipment, the building area and building space are reduced.
3. Wide range of materials to be treated: different thermal media can be used to treat both heat-sensitive materials and materials requiring high-temperature treatment. Common media include steam, heat transfer oil, hot water, cooling water, etc. It can be operated continuously or intermittently and can be used in many fields.
4. Little environmental pollution: no use of portable air and little entrainment of powder materials. The evaporation capacity of material solvent is very small, which is convenient for treatment. Closed-circuit circulation can be adopted for contaminated materials or working conditions requiring solvent recovery.
5. Low operating cost: the equipment operates normally, only 1 hour/day · person. Low-speed mixing and reasonable structure. The wear is small and the maintenance cost is very low.
6. Due to the small temperature gradient in the mixing section, the axial expansion of the material and the humidity of the mixing blade ensure the stability of the material.
| Process method | Solid content | Feed capacity | Output capacity |
| Wastewater: 40 m3/h | |||
| Screw filter | 20% | 4000kg/h | 830kg/h |
| Hollow Paddle Dryer (steam at 0.5Mpa) |
85% | 830kg/h | 195kg/h |
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