Blade dryer is an efficient drying equipment. The following is a detailed introduction to it:

I. Basic overview

Blade dryer, also known as paddle dryer, is a low-speed stirring dryer with stirring slurry inside the equipment to make wet materials fully contact with heat carriers and hot surfaces under the stirring of blades, so as to achieve the purpose of drying. Its structure is generally horizontal, double-axis or four-axis, and the internal hollow stirring blades are shaped like paddles, hence the name.

Second, the working principle

The working principle of the paddle dryer is mainly based on the principle of heat conduction. The main structure is a W-shaped shell with a jacket, in which a pair of hollow low-speed rotating hollow shafts are installed, and several stirring blades (paddles) are welded on the shafts. Heat carriers are introduced into these jackets and hollow stirring blades, so that the two heating surfaces can heat the materials at the same time. The heat carrier is usually fed from the middle of the dryer, passes through the surface of the stirred material layer and is discharged from the other side. Wedge-shaped hollow blades are densely arranged on the hollow shaft, so that the heat medium can pass through the blades through the hollow axial flow. This design has a large heat transfer area per unit effective volume, which makes the temperature range of heat medium wide (-40 C ~ 320 C), which can be water vapor or liquid such as hot water and heat transfer oil.

Third, the equipment characteristics

Efficient and energy-saving: the paddle dryer uses conduction heating to heat, and all heat transfer surfaces are covered with materials, thus reducing heat loss. No hot air takes away heat, and the heat utilization rate can reach above 90%.

Compact structure: the equipment structure is compact, and the device occupies a small area. The heat transfer surface of unit volume equipment is large, which can save the equipment floor space and reduce the capital investment.

Self-cleaning function: the heat transfer surface of wedge blade has self-cleaning function, and the relative movement of material particles and wedge surface produces scrubbing effect, which can wash away the attachments on wedge surface and keep the clean heat transfer surface during movement.

Good drying effect: the material is conveyed in a spiral trajectory along with the rotation of the paddle shaft to the direction of the discharge port, and the stirring is continued during the conveying, so that the water oozing from the sludge continues to evaporate, and the effect of uniform drying is achieved.

Fourth, classification

Blade dryers are mainly divided into hot air type and conduction type:

Hot air type: through the heat carrier (such as hot air) and the material to be dried to contact each other and dry.

Conductive: the heat carrier does not directly contact with the dried material, but the hot surface contacts with the material.

V. Application fields

Blade dryer is suitable for drying granular and powder materials, even for paste materials. Can be widely used in chemical industry, medicine, food, metallurgy, environmental protection and other industries, for drying various materials, such as sludge, resin, medicine, food, pigments and so on.

VI. Price and Purchase

The price of blade dryer varies with brand, model, configuration, production capacity and material. When purchasing, it is suggested to choose the appropriate brand and model according to the actual demand, and consult professionals to obtain accurate quotations and recommendations. At the same time, factors such as after-sales service and maintenance of equipment need to be considered.

To sum up, the paddle dryer has been widely used in all walks of life because of its advantages of high efficiency, energy saving, compact structure and good drying effect. In the process of purchasing and using, it is necessary to fully understand the performance and characteristics of the equipment, and choose and operate according to the actual needs.