PLG series continuous disc dryer

overview

The PLG series continuous disc dryer is an efficient conductive continuous drying equipment. Its unique structure and working principle determine that it has the characteristics of high thermal efficiency, low energy consumption, small footprint, simple configuration, convenient operation and control, and good operating environment. It is widely used in drying operations in industries such as chemical, pharmaceutical, pesticide, food, feed, and agricultural and sideline product processing. Highly praised in practical applications across various industries. We currently produce three types of products: atmospheric pressure, sealed, and vacuum, with four specifications of 1200, 1500, 2200, and 3000. A (carbon steel), B (stainless steel for contact materials), and C (stainless steel for steam pipelines, main shafts, and supports, and stainless steel for cylinder and top cover lining) are available in three materials. The drying area is 4-180m2, and we have formed a series of products that can provide various auxiliary equipment to meet the drying needs of users for various materials.

Working principle

The wet material is continuously added to the upper layer of the drying disc of the dryer by the feeder, and the rake arm with rake blades rotates to make the rake arm rotate and make the rake blades continuously flip the material. The material flows along an exponential spiral over the surface of the drying disc, and the material on the small drying disc is transferred to the outer edge, where it falls onto the outer edge of the large drying disc below. The material moves inward on the large drying disc and falls into the next layer of small drying disc from the middle discharge port. The drying plates of different sizes are arranged alternately up and down, allowing the material to flow continuously through the entire dryer. A hollow drying tray is filled with heating medium, which includes saturated steam, hot water, and 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 bottom layer of the drying tray to the bottom layer of the shell, and is transferred to the discharge port by the rake blade for discharge. Moisture escapes from the material and is discharged through the dehumidification port located on the top cover. The moisture in the vacuum disc dryer is discharged through the vacuum pump port located on the top cover. Dry materials discharged from the bottom layer can be directly packaged. By adding auxiliary equipment such as fin heaters, solvent recovery condensers, bag filters, dry material mixing mechanisms, and induced draft fans, the production capacity of drying can be improved. Drying paste like and heat sensitive materials can facilitate solvent recovery and enable pyrolysis and reaction operations.

Scope of adaptation

Drying, pyrolysis, combustion, cooling, reaction, sublimation

Technical Characteristics

（1） Drying dish

◎ Design pressure: Generally 0.4MPa, up to 1.6MPa.

◎ Operating pressure: generally ≤ 0.4MPa, up to 1.6MPa.

Heating medium: Steam, hot water, heat transfer oil. When the temperature of the drying disc is 100 ℃, hot water is used for heating. When the temperature is between 100 ℃ and 150 ℃, saturated steam or superheated steam with a pressure of ≤ 0.4MPa is used for heating. When the temperature is between 150 ℃ and 320 ℃, heat transfer oil is used for heating. When the temperature is above 320 ℃, methods such as electricity, heat transfer oil, and molten salt can be used for heating.

（2） Material conveying system

◎ Spindle speed: 1-10 RPM, electromagnetic or variable frequency stepless speed regulation.

◎ Rake arm: There are 2-8 rake arms fixed on the main shaft on each layer of the drying disc.

◎ Rake blade: Twisted onto the rake arm, it can float up and down with the disc surface to maintain contact, and has various forms.

◎ Rolling: For materials that are prone to clumping and need to be crushed, adding rolling at appropriate positions can enhance heat transfer and drying processes.

（3） There are three types of shells: atmospheric pressure, sealed, and vacuum

◎ Atmospheric pressure type: cylindrical or octagonal prism type, with two types of structures: integral and split. The main pipeline for the inlet and outlet of the heating medium can be located inside or outside the shell.

Sealed type: cylindrical shell, capable of withstanding an internal pressure of 5KPa. The main pipes for heating medium inlet and outlet can be located inside or outside the shell.

◎ Vacuum type: cylindrical shell, designed pressure of 0.1Mpa, with the main inlet and outlet pipelines of the heating medium inside the shell.

（4） Air heater

Generally used in situations with high evaporation to enhance drying efficiency.