Automatic Vertical Top Discharge Centrifuge

The Automatic Vertical Top Discharge Centrifuge is a batch filtration system designed for solid-liquid separation of high-purity or shear-sensitive suspensions. By utilizing a top-loading filter bag extraction method instead of a mechanical scraper, this system minimizes mechanical impact on solids, helping preserve crystal structure and reducing solid residue inside the basket.

1. Feeding Phase: Slurry enters the rotating basket through a distribution pipe at a regulated speed to ensure uniform cake distribution.
2. Separation Phase: The basket accelerates to operational speed, forcing liquid through the filter bag and basket perforations via centrifugal force.
3. Washing Phase: Wash fluid is applied through multi-directional spray nozzles to displace and wash impurities from the filter cake.
4. Deliquoring Phase: High-speed spinning extracts surface moisture from the cake matrix.
5. Deceleration & Discharge: The drive system brakes the basket to a complete stop. The top lid opens, and an overhead hoist or pneumatic davit lifts the filter bag out of the basket to discharge the solid cake directly into a collection container.

Suitable Applications

• Shear-Sensitive Solids: Crystalline or fragile products where maintaining original particle size distribution is required.
• Difficult-to-Discharge Cakes: Fibrous, tacky, or compressible solids that tend to blind or stick to scraper blades.
• Multi-Product Lines: Operations requiring visual inspection of the basket interior and fast media replacement.

Operating Limits

• Particle Size Range: 10 um to 5 mm (optimal filtration efficiency typically above 20 um).
• Slurry Concentration: 5% to 60% solids by weight.

Unsuited Applications

• Ultrafine Non-Flocculated Slurries (< 5 um): High risk of particle bypass through woven filter media. (Recommended alternative: Solid Bowl Decanter or Disc Stack Separator).
• Non-Pumpable Heavy Sludges: Prevents uniform cake distribution along the basket wall. (Recommended alternative: Chamber Filter Press).

Wetted Construction Materials: Stainless Steel 304, 316L, 2205 Duplex Stainless Steel, Titanium, or fluoropolymer linings (PTFE/ECTFE/Halar).

Surface Finish: Internal process surfaces ground to Ra <= 0.4 um (optional electro-polishing to Ra <= 0.2 um). Internal radii designed at R >= 10 mm to support thorough cleaning.

Clean-In-Place (CIP): Integrated multi-directional spray manifolds cover the cover underside, drum exterior, and housing walls for automated cleaning cycles.

Low-Headroom Engineering: For facilities with restricted ceiling heights (e.g., under 3.5 m), units can be configured with lower structural frames, low-profile drives, and customized davit arms for cleanroom integration.

Factory Acceptance Testing (FAT): Every machine undergoes factory testing prior to shipment, covering mechanical balance, noise testing (< 80 dBA at 1 m), CIP spray coverage, and safety interlock verification.

Quality Standards: Manufactured under ISO 9001-certified quality management systems and compliant with EU Machinery Directive 2006/42/EC and Low Voltage Directive.

Certifications: Flameproof motors, control cabinets, and sensors supplied with ATEX / IECEx certificates upon request.

Validation Package: Complete IQ/OQ templates, EN 10204 3.1 material test certificates, FDA compliance letters for elastomeric seals, and surface roughness measurement logs provided upon request.

Please submit your process parameters below. Our engineering team will review your requirements and provide a technical proposal and sizing recommendation within 24 hours.

Slurry / Material Name:

Particle Size Distribution (D50 / Mesh):

Solid Concentration (wt%):

Solvent / Liquid Phase Composition:

Operating Temperature (°C):

Target Processing Capacity per Batch (kg or L):

Explosion-Proof Requirement (Non-Ex / Zone 1 / Zone 2):

Preferred Contact Material (316L / Duplex / Lined):

Required Validation Documents (IQ/OQ/FAT/MTR):

1. When should I choose a top-discharge bag centrifuge over a bottom-discharge scraper model?

Choose top discharge when crystals are fragile, or the cake is fibrous, tacky, or compressible, since the bag lift involves no scraper contact.

2. How much product remains in the basket after the bag is lifted out?

Typically under 1% of the batch weight stays in the basket, compared with a 10-20 mm heel layer left by a scraper.

3. Which filter bag material should I choose?

Polypropylene suits pH 1-13 up to about 90°C, polyester suits neutral and mild solvent media up to 130°C, and PTFE suits aggressive solvents up to 200°C.

4. What cake moisture can I expect for typical products?

Typical results are 5-15% for API crystals, 2-5% for coarse food crystals such as citric acid, and 15-30% for fibrous or compressible solids. Narrow particle distributions above 50 µm reach the low end.

5. How long does one batch cycle take?

A typical cycle is 25-45 minutes, including 5-10 minutes for bag lifting and unloading.

6. How much headroom do I need for the bag lift?

Standard units need about 4.5-5.5 m for a 1250 mm basket with the hoist or davit raised. Low-headroom configurations bring this below 3.5 m by using a shorter lift stroke and a swing-away davit.

7. What is the typical lead time?

Stainless steel models ship in 60-90 days from the deposit, and titanium or lined builds in 100-130 days. ATEX/IECEx configurations add 2-4 weeks.

8. Can you test my sample before I order?

Yes, we run spin tests on 2-5 kg of slurry or wet solids and report cake moisture, filtration rate, and the recommended bag micron rating.

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