Disc Dryer

product Overview

The disc-type continuous dryer is a highly efficient conduction-based drying equipment. Its unique structure and operating principle make it particularly suitable for applications in industries such as chemicals, pharmaceuticals, pesticides, food processing, feed production, and the processing of agricultural products. This device comes in three types: atmospheric pressure, sealed, and vacuum versions. There are four different specifications available: 1200, 1500, 2200, and 3000 square meters per unit. The material options include A (carbon steel), B (stainless steel used for the parts that come into contact with the material), and C (stainless steel for steam pipelines, the main shaft, and supports; the cylinder and cover are also made of stainless steel). The drying area can range from 4 to 180 square meters, offering hundreds of different models available for purchase.

working principle

Wet materials are continuously fed from the feeder onto the first layer of drying trays located at the top of the dryer. The raking arms, equipped with rake blades, move in a rotary motion, allowing the blades to continuously turn over the materials. The materials flow along an exponential spiral path across the surface of the drying trays: those on the smaller drying trays are moved to the edge and fall onto the outer edge of the larger drying trays; while the materials on the larger drying trays move inward and fall through the openings in the middle into the next layer of smaller drying trays. The smaller and larger drying trays are arranged alternately, enabling the materials to flow continuously throughout the entire dryer. Steam, hot water, or heat transfer oil is introduced into the hollow drying trays from one end and discharged from the other end. The dried materials fall from the last layer of drying trays onto the bottom of the dryer, where they are transferred by the raking blades to the discharge port for removal. The moisture-laden materials are expelled through the moisture drainage ports at the top of the dryer, while vacuum-type dryers have their moisture expelled through the vacuum pump ports. By incorporating additional equipment such as finned heaters, solvent recovery condensers, bag filters, material recycling systems, and exhaust fans, the production capacity can be improved. This allows for the drying of pastes and heat-sensitive materials, the recovery of solvents, as well as thermal decomposition and reaction processes to be carried out.

performance characteristics

• Easy to regulate and highly adaptableBy adjusting the thickness of the material layer, the speed of the main shaft, the number of rake arms, and the shape and size of the rake blades, the drying process can be brought to an ideal state. Each drying tray can be independently supplied with hot/cold media, ensuring precise control over the material temperature. The residence time of the materials is adjustable. The material flow is uniform, with no backflow, resulting in even drying and stable quality. There is no need for further mixing.
• simple operationThe operation of driving and stopping the machine is very simple. After the feeding stops, the rake leaves can quickly empty the materials inside the dryer. It’s also possible to carefully clean and inspect the interior of the equipment through the large viewing port.
• low energy consumptionThe material layer is thin, and the rotational speed of the main spindle is low. The conveying system has minimal power consumption and electricity usage. The drying process involves conduction heat transfer, resulting in high thermal efficiency and low energy consumption.
• Good operating conditions, capable of using recyclable solventsThe atmospheric-pressure type has almost no dust contamination in its top exhaust gas. The sealed-type solvent recovery device allows for the use of nitrogen to circulate the gases, making it suitable for handling flammable, explosive, and toxic materials. The vacuum-type is particularly suitable for handling heat-sensitive materials.
• Easy to install and occupies little spaceIt is delivered in its entirety, and can be transported without any special handling. Simply lift it into place; the drying units are arranged in layers, and they are installed vertically. This arrangement allows for a large drying area while using minimal space.

technical characteristics

• drying panThe designed pressure is generally 0.4 MPa, with a maximum value of 1.6 MPa possible. The heating medium can be steam, hot water, or heat transfer oil. At temperatures below 100°C, hot water can be used. At temperatures between 100–150°C, saturated/or过热蒸汽 with a pressure of ≤0.4 MPa can be used. At temperatures between 150–320°C, heat transfer oil should be used. For temperatures above 320°C, electrical energy, heat transfer oil, or molten salts can be utilized as the heating medium.
• material conveying systemSpindle speed: 1–10 r/min. Electromagnetic or variable-frequency stepless speed regulation available. Each layer contains 2–8 rake arms. The rake blades are hinged and can float along with the surface of the material. For materials that tend to clump together, a grinding device can be used.
• housingAtmospheric type (cylindrical or octagonal design, either integral or split-type); Sealed type (capable of withstanding pressures up to 5 kPa); Vacuum type (designed for use under pressures of 0.1 MPa).

Adapt to materials

Drying, pyrolysis, combustion, cooling, reactions, sublimation — organic chemical products, inorganic chemical products, pharmaceuticals, food, feed, fertilizers.

technical parameters