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Paddle Sludge Dryer Machine Equipment Sewage Slurry Drying Treatment Process System

The hollow paddle sludge dryer is a kind of horizontal stirring continuous sludge drying equipment mainly based on heat conduction. Because the stirring blade is like a boat oar, it is called paddle dryer, also known as trough dryer or stirring dryer.

Paddle dryer can indirectly heat or cool paste, granular, powder, slurry materials, can complete drying, cooling, heating, sterilization, reaction, low temperature combustion and other unit operations. The special wedge-type stirring heat transfer slurry blade in the hollow blade dryer equipment has high heat transfer efficiency and self-cleaning function of heat transfer surface.

The application industries of paddle sludge dryer machine:

Hollow paddle dryer equipment is widely used in petrochemical, chemical, metallurgy, food, medicine, pesticide and other industries in the powder, granular, filter cake, slurry material drying. Our company's technology research and development center after a variety of different forms of sludge small-scale drying test, for specific sludge, on the basis of hollow paddle dryer, developed the RD multi-layer multi-stage multi-effect dryer technology and equipment suitable for environmental protection industry.

    Project Introduction

    Working principle of hollow paddle dryer machine:

    The hollow shaft is densely arranged with wedge-shaped hollow paddles, and the hot medium flows through the blades to the hollow shaft. The heat transfer area per unit of effective volume is large, and the temperature of the heat medium is from -40℃ to 320℃, which can be water vapor or liquid type: such as hot water, heat conduction oil, etc. Indirect conduction heating, without carrying air away heat, heat is used to heat the material. In the drying process of the material, the hollow shaft with hollow paddle heats the material and stirring the material at the same time, so as to update the heating surface. It is a continuous conduction heating dryer. The heat loss is only the heat dissipation to the environment through the insulation layer of the body. The heat transfer surface of wedge blade has self-cleaning function. The relative movement of the material particles and the wedge surface produces a washing effect, which can wash off the material attached to the wedge paddle surface and keep the clean heat transfer surface during operation. The shell of the paddle dryer is Ω type, and two to four hollow stirring shafts are generally arranged in the shell. The shell has a sealed end cover and upper cover to prevent the leakage of material dust and play a full role. 


    The heating medium flows through the casing jacket and the hollow stirring shaft through the rotating joint, and the material is heated and dried by conduction heating. The structure of the hollow paddle shaft of different materials is different to ensure better heat transfer effect. The material is added by the feeding port, and the interface is updated under the stirring action of the two hollow paddle shafts. At the same time, the material is promoted to the discharge port, and the dried material is discharged by the discharge port.

    Project Introduction

    Composition of sludge paddle dryer machine:

    The paddle sludge dryer is a slurry drying equipment widely used in the sludge drying process. Also known as sludge paddle dryer or hollow paddle dryer. The machine consists of several key components that work together to effectively dry sludge and other materials.


    1.The hollow blade dryer is mainly composed of a mixing spindle, a transmission mechanism, a box body, a bearing body, a rotating joint, a discharge adjustment mechanism, etc. Spindle stirring plays a vital role in the operation of the paddle sludge dryer. It consists of two hollow shafts and several wedge-shaped hollow blades on the surface. When working, the main shaft mixing part stirs, pushes, heats or cools the materials to ensure a uniform and thorough drying process.

    2.The power transmission component of the paddle sludge dryer is responsible for transmitting the power of the motor to the main shaft for stirring. It consists of an electric motor, a driving gear, a driven gear, a reducer and an inter-axis gear to ensure that the machine operates within the rated speed range.

    3.The bearing body of the paddle sludge dryer is another key component, with two or three bearing bodies installed at both ends. These bearing bodies consist of bearings, bearing seats, bearing caps, sealing packings, packing glands and inspection covers. They play a vital role in supporting the spindle and ensuring smooth operation.


    4.The hollow blade dryer is equipped with a heat transfer medium return tank in the hollow shaft and a rotary joint for the medium to enter and exit. This component can effectively heat or cool materials during the drying process.

    5.The sludge paddle dryer is a sophisticated piece of equipment, and each component plays a vital role in its operation. Through the careful design and composition of the hollow paddle dryer, sludge and other materials can be dried efficiently and effectively.


    One of the main product features of hollow blade dryers is low energy consumption. This is due to indirect heating, which means there's not a lot of air to carry away the heat. In addition, the outer wall of the dryer is equipped with an insulation layer to further reduce heat loss. For slurry materials, only 1.2 kg of water vapor is needed to evaporate 1 kg of water, making it an energy-saving option for drying operations.

     In addition to low energy consumption, paddle dryer systems also have low operating costs. It has a heat transfer surface per unit effective volume, shortening processing time and reducing the size of the equipment. This not only reduces the floor area and space required for equipment, but also saves costs for users.


    Another important feature of the hollow paddle dryer is the wide range of materials it can process. By using different heat media such as water vapor, thermal oil, hot water, cooling water, etc., it can process both heat-sensitive materials and materials that require high-temperature processing. This versatility makes it a valuable asset in a variety of industries, allowing continuous or intermittent operation in wastewater treatment, chemical processing, and more.

    Additionally, a hollow paddle dryer has environmental benefits as it produces less pollution than other drying methods. It uses no carrying air, so very little dusty material is entrained. Additionally, the material has minimal solvent evaporation, making it easy to handle contaminated materials or working conditions that require solvent recovery. The option of a closed-loop system further reduces environmental impact.

    The stable operation of the hollow paddle dryer is another outstanding feature. The special compression-expansion stirring effect of the wedge-shaped blades ensures full contact between the material particles and the heat transfer surface. This creates a stable environment that maintains consistent temperature, humidity and mixing gradients across the material, ensuring reliable, efficient processing.


    Finally, hollow blade dryers require minimal maintenance, resulting in lower operating costs. Its construction is designed to minimize wear, providing a cost-effective and reliable drying solution for a range of industries.

    In summary, hollow blade dryers offer a range of product features that make them an attractive and efficient option for sludge drying and treatment. With its low energy consumption, low operating costs, versatility, environmental benefits and stable operation, it is a valuable asset to various industries looking for efficient, cost-effective slurry drying solutions.


    This Sludge Drying Machine is suitable for processing all kinds of paste, granule, powder and other materials with good thermal stability, and can also dry heat-sensitive materials under special conditions and recover solvent in the drying process.


    Paddle dryer equipment has been successfully used in food, chemical, petrochemical, dye, industrial sludge and other fields slurry drying treatment process. The characteristics of heat transfer, cooling and stirring enable the following unit operations: combustion (low temperature), cooling, drying (solvent recovery) heating (melting), reaction and sterilization. The stirring paddle is also a heat transfer surface, which increases the heat transfer area per unit effective volume and shortenes the processing time. The heat transfer surface of wedge blade has the function of self-cleaning. Compression-expansion mixing function makes the material mix evenly. The material moves along the axial direction into a "piston flow", in the axial interval, the material temperature, humidity, mixing degree gradient is very small. Using heat conduction oil as heat medium paddle dryer can complete low temperature combustion work. For example, calcium sulfate dihydrate (Ca2SO4·2H2O) is burned and converted into calcium sulfate hemihydrate (Ca2SO4·1/22H2O). Sodium bicarbonate (NaHCO3) is converted into soda ash (Na2HCO3) by calcination. Through the cooling medium, such as water, cooling brine can be used for cooling. For example, the blade type soda cooling machine used in soda industry replaces the old air cooling soda cooling machine, which saves energy and exhaust gas treatment equipment and reduces operating costs. The main function of drying equipment, does not use hot air, so that solvent recovery, energy consumption, environmental control in an ideal state of easy handling. It is especially suitable for heat sensitive materials that need solvent recovery and are flammable and easy to oxidize. It has been widely used in fine chemical, petrochemical and dye industries. The uniformity of temperature, humidity, and mixing in the axial range enables the equipment to be used for heating or melting, or for some solid material reaction. It has been successfully used in compound fertilizer and modified starch industry. Paddle dryers can be used to sterilize food and flour. The large heating area in the unit effective volume quickly heats the material to the sterilization temperature, avoiding the change of material quality caused by long time heating.