Overview:
Disc continuous dryer is a highly efficient conduction-type continuous drying equipment. Its unique structure and working principle determine its characteristics, including high thermal efficiency, low energy consumption, small footprint, simple configuration, convenient operation and control, and a favorable operating environment. It is widely used in drying operations in industries such as chemicals, pharmaceuticals, pesticides, food, feed, and agricultural product processing. It has been highly praised in practical applications across various industries. The dryers can be classified into three main types: atmospheric, sealed, and vacuum. They come in various specifications, including 1200, 1500, 2200, and 3000. There are three material options: A (carbon steel), B (stainless steel for parts in contact with materials), and C (based on B, with additional stainless steel for steam pipelines, main shaft, and brackets, and stainless steel lining for the cylinder body and top cover). The drying area ranges from 4 to 180 m², with hundreds of models in the product series. Additionally, supporting auxiliary equipment is available to meet the drying needs of various materials.

Features:
(1) Easy to regulate and highly adaptable
1. By adjusting the material layer thickness, spindle speed, number of raking arms, and the type and size of raking blades, the drying process can be optimized.
2. Each layer of the drying tray can be supplied with hot or cold medium to heat or cool the material. The material is heated evenly, and temperature control is accurate and easy.
3. The residence time of materials can be precisely adjusted.
4. The material flows in a single direction without back-mixing, ensuring uniform drying, stable quality, and no need for further mixing.

(ii) Simple and easy to operate
1. The start-up and shutdown operations of the dryer are very simple.
2. After stopping the feed, the rake blades that convey the material can quickly empty the material inside the dryer.
3. Through the sight glass of a special large-size inspection door, the interior of the equipment can be carefully cleaned and observed.

(III) Low energy consumption
1. The material layer is very thin, the spindle speed is low, and the power required by the material conveying system is small, resulting in low energy consumption.
2. Drying is carried out using conductive heat, resulting in high thermal efficiency and low energy consumption.

(4) The operating environment is favorable, solvents can be recycled, and dust emissions meet the required standards.
1. **Atmospheric Pressure Type**: Due to the low airflow velocity inside the equipment and the humidity distribution being higher at the top and lower at the bottom, dust particles are unlikely to float to the top of the equipment. As a result, the exhaust gas discharged from the top moisture exhaust outlet contains almost no dust.
2. Closed Type: Equipped with a solvent recovery device, it can conveniently recover organic solvents from wet gases. The solvent recovery device is simple and has a high recovery rate. For flammable, explosive, toxic, and easily oxidized materials, nitrogen can be used as the carrier gas for closed-loop circulation to ensure safe operation. It is especially suitable for drying flammable, explosive, and toxic materials.
3. Vacuum type: A disc dryer operated under vacuum conditions, especially suitable for drying heat-sensitive materials.

(5) Easy to install and small footprint.
1. The dryer is shipped as a complete unit and transported as a whole, requiring only hoisting into position, making installation and positioning very easy.
2. Due to the layered arrangement and vertical installation of the drying trays, the floor space required is very small even for a large drying area.

Application:
Drying, pyrolysis, calcination, cooling, reaction, sublimation
(1) Organic Chemical Products
(II) Inorganic Chemical Products
(3) Pharmaceuticals and Food
(4) Feed, Fertilizer

Technical Features:
(1) Drying Tray
1. Design pressure: typically 0.4 MPa, **up to 1.6 MPa**.
2. **Operating pressure: generally ≤0.4MPa, up to 1.6MPa.**
3. Heating medium: steam, hot water, thermal oil. When the drying disc temperature is 100°C, use hot water for heating; between 100°C and 150°C, use ≤0.4MPa saturated steam or superheated steam for heating; between 150°C and 320°C, use thermal oil for heating.
(ii) Material Conveying System
1. Spindle speed: 1–10 rpm, with electromagnetic or variable frequency stepless speed regulation.
2. Rake arms: Each layer of the drying disc is equipped with 2 to 8 rake arms fixed on the main shaft.
3. Rake blades: Hinged on the rake arms, they can float up and down with the disc surface to maintain contact, and come in various forms.
4. Grinding roller: For materials that are prone to caking or require crushing, adding a grinding roller at an appropriate position can enhance heat transfer and the drying process.

(3) Shell
There are three types: atmospheric pressure, sealed, and vacuum.
1. Atmospheric type: cylindrical or octagonal prism shape, available in integral and split structures. The main inlet and outlet pipes for the heating medium can be located either inside or outside the shell.
2. Sealed type: Cylindrical shell capable of withstanding an internal pressure of 5 KPa. The main inlet and outlet pipes for the heating medium can be located either inside or outside the shell.
3. Vacuum type: Cylindrical shell, design pressure of -0.096 MPa, main inlet and outlet pipes for the heating medium are located inside the shell.

(4) Air Heater
Generally used when configuring the induced draft fan to prevent moist ambient air from entering the main unit and affecting the drying effect.
Principle:
Wet material is continuously fed from the feeder onto the **top layer** of drying trays in the dryer. The rabble arm, equipped with rabble blades, performs a rotary motion, continuously turning and spreading the material. The material flows across the surface of the drying trays along an exponential spiral path. On the small drying trays, the material is moved to the outer edge, while on the large drying trays, it moves inward and falls through the central discharge opening onto the next layer of small drying trays below. The large and small drying trays are arranged alternately in an up-and-down configuration, allowing the material to flow continuously through the entire dryer. Heating medium is introduced into the hollow drying trays, which can be in the form of saturated steam, hot water, or thermal oil. The heating medium enters from one end of the drying tray and exits from the other end. The dried material falls from the last layer of drying trays to the bottom of the shell and is then moved by the rabble blades to the discharge outlet for removal. Moisture escapes from the material and is discharged through the moisture exhaust port located on the top cover. For vacuum-type tray dryers, the moisture is extracted through the vacuum pump port on the top cover. The dry material discharged from the bottom can be directly packaged. By adding auxiliary equipment such as fin heaters, solvent recovery condensers, bag filters, dry material recirculation mechanisms, and induced draft fans, the drying capacity can be enhanced. This allows for the drying of paste-like and heat-sensitive materials, convenient recovery of solvents, and the ability to perform pyrolysis and reaction operations.