Second hand Shanghai Ruiwei 650 horizontal screw centrifuge

In many industrial scenarios such as municipal sewage treatment, chemical waste recycling, and food processing, efficient and continuous solid-liquid separation is a key link to ensure production efficiency and environmental compliance. As one of the current mainstream mechanical dehydration equipment,Decanter Centrifuge(Full name: Horizontal spiral discharge settling centrifuge) With its advantages of high automation, strong processing capacity, and stable operation, it is gradually replacing traditional plate and frame filter presses and becomingSludge dewateringSeparated from materialsprimaryplan

This article will provide a systematic analysisDecanter CentrifugeThe working principle, core structure, key parameters, typical application scenarios, and selection points of the equipment help engineers quickly grasp the technical points and scientifically complete equipment selection.

What is a decanter centrifuge?

Second hand Shanghai Ruiwei 650 horizontal screw centrifugeIt is a mechanical device that utilizes centrifugal force generated by high-speed rotation to achieve continuous separation of solid and liquid phases in suspension. Its "horizontal" refers to the horizontal placement of the drum, while the "spiral discharge" automatically pushes out the settled solid through the built-in spiral conveyor, achieving a continuous feeding and discharging process.

Compared to intermittent equipment such as plate and frame filter presses, second-handShanghai Ruiwei 650 Horizontal Spiral CentrifugeMore suitable for handling materials with low solid content (usually 1% -10%) and high flow rate, widely used in municipal applicationsSludge dewateringChemical mother liquor, starch slurry, animal protein extraction and other fields.

The core structure and working principle of a decanter centrifuge

Main components:

Drum: a cylindrical cavity that rotates at high speed, generating a centrifugal force field;

Spiral conveyor: located inside the drum, rotating in the same direction at a slightly lower speed than the drum, responsible for pushing settled solids;

Gear Differential: controls the speed difference between the drum and the screw (i.e. "differential");

Shell and inlet/outlet system: including liquid-phase overflow weir, solid-phase slag discharge outlet, etc.

Workflow description:

Feed: The suspension enters the center of the drum through the feed pipe;

Acceleration: The material is accelerated within the spiral cavity to the rotational speed of the drum;

Settlement separation: Under the action of centrifugal force, solid particles with higher density settle to the inner wall of the drum;

Solid phase transportation: The spiral pushes the solid towards the cone end slag discharge port at a small differential speed;

Liquid phase discharge: Clear liquid flows out from the overflow weir at the large end of the drum.

Key performance parameters:

Drum speed: usually 2000-4000 rpm, the higher the speed, the greater the separation factor;

Length to diameter ratio (L/D): commonly ranging from 3:1 to 4:1, affecting residence time and separation efficiency;

Differential speed: usually 5-30 rpm, the smaller the differential speed, the longer the solid residence time, and the drier the mud cake;

Processing capacity: ranging from 5 m ³/h to 100+m ³/h, depending on the model.

Application Cases of Horizontal Spiral Centrifuge in Typical Industries

Municipal sewage treatmentUsed for dewatering residual activated sludge, the inlet moisture content is about 98%, and the outlet moisture content can be reduced to 75% -80% without the need for a large amount of flocculants, supporting 24-hour continuous operation.

Chemical and pharmaceutical industryUsed for catalyst recovery, crystallization mother liquor separation, and dehydration of antibiotic mycelium, the equipment material should be corrosion-resistant (such as 316L stainless steel or Hastelloy alloy).

Food and BiotechnologyUsed for juice clarification, yeast recovery, fish meal processing, starch washing, and must comply with hygiene standards to avoid cross contamination.