PLG disc dryer

Product Introduction

Disc continuous dryer is an efficient conductive continuous drying equipment. Its unique structure and working principle determine its 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 types: 1200, 1500, 2200, and 3000. A (carbon steel), B (stainless steel uniformly distributed in the contact material part), and C (on the basis of B, stainless steel is added to the steam pipeline, main shaft, and bracket, and stainless steel is lined inside the cylinder and cover). Three types of materials, with a drying area of 4-180m2, a series of hundreds of models of products, and can provide matching auxiliary equipment to meet the needs of users for drying various materials.

Working principle

The wet material is continuously added to the first layer of drying disc on the upper part 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 last layer of the drying tray to the bottom of the shell, and is finally transferred by the rake blades to the discharge port 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.

Performance characteristics

（1） Easy regulation and strong applicability

By adjusting the thickness of the material layer, spindle speed, number of rake arms, rake blade type and size, the drying process can be optimized.

Each layer of the drying tray can be separately heated or cooled by adding a heating medium or a cooling medium to the material, ensuring accurate and easy temperature control of the material.

The residence time of materials can be precisely adjusted.

The material has a single flow direction, no backmixing phenomenon, uniform drying, stable quality, and does not require further mixing.

（2） Easy to operate and convenient

The operation of driving and parking the dryer is very simple.

After stopping the feeding, the material scraper blade can quickly empty the material in the dryer.

Through the special large inspection door mirror, careful cleaning and observation can be carried out inside the equipment.

（3） Low energy consumption

The material layer is very thin, the spindle speed is low, and the material conveying system requires less power and consumes less electricity.

Drying with conductive heat results in high thermal efficiency and low energy consumption.

（4） Good operating environment, recyclable solvents, and dust emissions meet requirements

◎ Atmospheric pressure type: Due to the low airflow velocity and low humidity distribution inside the equipment, it is difficult for dust to float to the top of the equipment. Therefore, the exhaust gas discharged from the top humidity outlet contains almost no dust.

Sealed type: equipped with a solvent recovery device, which can easily recover organic solvents in the wet gas. The solvent recovery device is simple and has a high recovery rate. For flammable, explosive, toxic, and easily oxidizable materials, nitrogen can be used as a carrier gas for closed-loop circulation to ensure safe operation. Specially suitable for drying flammable, explosive, and toxic materials.

◎ Vacuum type: A disc dryer operated in a vacuum state, particularly suitable for drying heat sensitive materials.

（5） Easy installation and small footprint

The dryer is shipped as a whole and only needs to be lifted into place for easy installation and positioning.

Due to the layered arrangement and vertical installation of the drying tray, even if the drying area is large, the footprint is also very small.

Technical Characteristics

（1） Drying dish

◎ Design pressure: generally 0.4MPa, up to a maximum of 1.6MPa.

Maximum 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.

Adapt to materials

Drying, pyrolysis, combustion, cooling, reaction, sublimation

◎ Organic chemical products ◎ Inorganic chemical products ◎ Medicine and food ◎ Feed and fertilizer