The screw dehydrator is a common industrial equipment, which is used to separate the moisture from the wet solid matter, such as sludge, slurry, etc., through the action of mechanical force, so as to achieve the purpose of solid-liquid separation. It is widely used in environmental protection, chemical industry, food processing and other fields. This article will introduce the principle and working process of the screw dehydrator.

1. Principle

The working principle of the screw dehydrator is based on the combination of centrifugal separation and filter pressure. It is mainly composed of a screw host, a filter screen, a reducer, a feeding device, and a discharging device.

The core component of the screw dehydrator is the screw host. There is a screw shaft inside the screw host, and the screw shaft is covered with screw blades. When the feed material is sent into the screw host, due to the rotation of the screw blades, the solid particles are pushed to the outlet direction of the screw shaft, and the water is squeezed out. The gap of the helical blade gradually decreases, so that the solid matter is gradually discharged during the advancing process. At the same time, the function of the filter screen prevents the passage of solid particles and only allows water to flow out, thereby achieving solid-liquid separation.

2. Working process

The working process of the screw dehydrator can be divided into four stages: feeding, separating, pressing and discharging.

Feeding: Wet solid matter is fed into the screw host of the screw dehydrator through the feeding device.

Separation: The screw shaft inside the screw host starts to rotate, and the screw blades push the solid matter towards the outlet. During this process, due to centrifugal force and filter pressure, solids and liquids are gradually separated, solid particles are squeezed to the outlet end of the screw shaft, and water flows out through the filter.

Squeeze: As the solid material advances, the gap between the spiral blades gradually decreases, so that the solid material is subjected to greater extrusion force, further reducing the moisture content in it.

Discharging: After a series of extrusion, the solid matter is finally discharged out of the screw dehydrator, and the water flows out of the screw main machine through the filter, finally achieving the purpose of solid-liquid separation.

3. Application

Spiral dehydrator has important application value in many fields:

Environmental protection field: In sewage treatment plants, screw dehydrators are often used to remove water from sludge, thereby reducing waste volume and facilitating subsequent treatment and disposal.

Chemical industry: The slurry produced in the chemical process usually requires solid-liquid separation, and the screw dehydrator can efficiently complete this task.

Food processing: In the process of food processing, if juice is produced, the screw dehydrator can be used to separate the juice from the slurry and improve the purity of the product.

Metallurgical industry: In the metallurgical process, the screw dehydrator is used to process metallurgical slag and separate useful metal components from it.

To sum up, the screw dehydrator realizes the solid-liquid separation of wet solid substances through the combination of centrifugal separation and filtration pressure. Its application in many fields makes the production process more efficient, environmentally friendly, and provides the possibility for resource recovery.

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