rotary dryer

rotary dryer Introduction

A rotary dryer is a device used to dry granular materials. It is usually composed of a long cylinder that rotates at a slight tilt. It is suitable for drying granular materials. This type of equipment is also called a rotary dryer or a drum dryer. The working principle of a rotary dryer is to dry the material through the rotation of the long cylinder.

The main functions of the rotary dryer

Accelerate Drying Rate

By performing rotary heating drying under vacuum conditions, the system uses a vacuum pump to remove moisture and create a vacuum state, thus accelerating the drying rate. This equipment is suitable for industrial use to dry materials and enhance drying efficiency.

Drying Filter Cake and Similar Materials

The rotary flash dryer is particularly effective for drying filter cake and similar materials. This equipment achieves drying by rotating, making it suitable for various material forms.

Heat Transfer Drying

The tubular rotary dryer uses concentric, internally arranged heating tubes within a rotating cylinder to transfer heat and perform drying. It is a type of heat transfer drying machine, also known as a steam tube dryer. This device uses indirect heating to dry the material.

Drying Workpieces

The rotary vibrating dryer is primarily used for drying and polishing workpieces. It can operate continuously or intermittently. Workpieces dried by this machine will not show water marks on their surfaces and can be further polished. The machine allows automatic separation of workpieces and adjustable heating temperatures, making it efficient and energy-saving.

The structure of the rotary dryer

Main Unit

This is the core part of the rotary dryer, including the rotating body, heating plates, cooling plates, and vacuum plates. The rotating body, made of stainless steel, houses both the heating and vacuum systems. The heating plates and cooling plates are used to heat and cool the material, while the vacuum plates remove moisture from the wet material.

Hot Air Distributor

This device evenly distributes hot air into the spiral feeder, ensuring that the material receives uniform heating in the drying chamber.

Spiral Feeder

This component evenly introduces the material into the drying chamber.

Stirrer

The stirrer agitates the material within the drying chamber to create a fluidized state, enhancing the contact between the hot air and the material and improving drying efficiency.

Classifier

This separates the dried material to ensure the uniformity of the product quality.

Rotary Drying Chamber

This is the main component of the dryer, featuring a conical bottom and an outer ring for the hot air distributor, used for drying the material.

Outer Shell

This encloses the entire drying system, protecting the internal structure and maintaining system sealing.

Sealing Structure

Installed at the material inlet and outlet ends of the rotating cylinder, this structure prevents hot air from bypassing the material layer inside the cylinder.

Dynamic Seal

Located between the rotating cylinder and the outer shell, this seal prevents hot air from bypassing the material layer inside the cylinder.

Fine Powder Receiver and Spiral Conveyor

Installed beneath the outer shell, these components collect fine powder materials and transport them out via the spiral conveyor.

Main advantages of rotary dryer

High Drying Intensity

The rotary dryer is suitable for drying paste-like and filter cake materials, offering a high drying capacity.

Compact Size

Compared to spray drying equipment with the same production capacity, the rotary dryer is much smaller, approximately one-tenth the size.

Short Drying Time

It is especially suitable for drying heat-sensitive materials due to its short drying time, which helps maintain the material's heat sensitivity.

No Wall Sticking

The equipment does not experience wall sticking, ensuring smooth drying operations.

Energy-Efficient and Environmentally Friendly

Compared to box-type drying methods, it eliminates the need for crushing after drying, saving 30-50% in energy. Additionally, its closed operation results in no environmental pollution.

Reasonable Structure and Excellent Craftsmanship

The rotary kiln dryer features a well-designed structure and excellent craftsmanship, providing high output, low energy consumption, and ease of operation.

High Reliability

It uses a gearbox drive instead of the usual belt drive, resulting in maintenance-free operation and increased reliability and durability.

Wide Application Range

It is suitable for drying materials such as magnetic, heavy, and floating concentrates from metal and non-metallic ores, as well as clay from the cement industry and coal slurry from the coal mining industry.

pplication of rotary dryer

rotary dryer is widely used for drying small particles of loose materials in chemical industry, light industry, agriculture, food industry, feed industry and other industries. For example, in light industry, it can dry brewer’s grain, bean dregs, grain, sawdust, Marc, sand, slag and other drugs; In chemical industry, it can dry small particles, powdered materials and inorganic minerals and other materials; In starch industry, it can dry corn germ, corn bran, corn (maize) fibre, protein powder, etc: In feed industry, it can dry bran, corn pieces, bean dregs,etc; In fish industry, it can dry fodder of fish and shrimp; In oil industry, it can dry rapeseed (not as seeds). In breeding industry, it can dryer chicken manure, pig manure, cow dung and others.

Technical parameters of rotary dryer