Flat Type Bag Centrifuge

The PLD Series Flat-Type Centrifuge is a batch-operated, vertical bottom-discharge filtration system designed for solid-liquid separation of fine, hazardous, or high-purity industrial slurries.

Common industrial applications include active pharmaceutical ingredient (API) processing, fine chemical crystallization, food additive separation, and lithium battery material dewatering.

1. Acceleration and Feeding Phase: Basket accelerates to feed speed (300–600 rpm) while slurry is uniformly distributed via the feed pipe.
2. Centrifugal Filtration Phase: High G-force drives liquid through the filter cloth while target solids build up inside the basket.
3. Cake Washing Phase: Washing fluid is introduced via spray manifolds to displace residual mother liquor from the cake.
4. Spin Drying Phase: Basket operates at maximum rated speed to mechanical dewatering targets.
5. Mechanical Scraping Phase: Basket decelerates to low rotation speed (50–100 rpm) while the hydraulic or pneumatic scraper removes the main cake layer.
6. Zero-Speed Bag Pulling Phase: Basket achieves physical standstill (0 rpm), triggering the pneumatic mechanism to lift and shake the filter bag for residual heel removal.

• Wetted Components: Stainless steel S30408 (AISI 304) or S31603 (AISI 316L) as standard; Duplex S32205 or Hastelloy C-276 available for corrosive environments.
• Seals and Gaskets: EPDM, FKM, or PTFE selected according to solvent compatibility and process temperatures.
• Surface Finishing: Internal wetted surfaces are ground and polished to a surface roughness of Ra less than or equal to 0.4 micrometers.
• Material Traceability: EN 10204 Type 3.1 Material Test Certificates (MTCs) supplied for specified major components, subject to the agreed documentation scope.

Note: Our company can customize production according to user requirements.

Housing Configurations: Available in standard fixed casing, full clamshell opening, or fully sealed reversible housing for complete internal inspection.

Drive Motor Setup: Inverter-duty motor directly coupled or V-belt driven, adaptable for low-headroom plant layouts.

Process Nozzles: Customizable slurry feed, cake wash, sight glass, and level sensor connections matching ANSI, DIN, or Tri-Clamp standards per site P&ID requirements.

Discharge Interfaces: Mating round or square bottom-discharge flanges configured for direct integration with downstream hoppers, rotary valves, or dryers.

• Operational Limits: Suited for suspensions with solid particle sizes between 5 micrometers and 2000 micrometers and feed concentrations from 5% to 60% by weight.
• Application Evaluation: Practical dewatering rates, cake moisture content, and throughput depend on slurry viscosity, solid density, and cake compressibility.

• Integrated CIP System: Internal spray nozzles cover the housing walls, drum exterior, and discharge chutes using compatible cleaning fluids at a supply pressure of 0.2–0.3 MPa.
• Drain Design: The self-draining casing interior minimizes liquid retention between batch transitions, helping reduce cross-contamination risks.

• Cover Safety Interlock: The cover locking system prevents opening until basket standstill (0 rpm) has been verified by the specified safety monitoring system.
• Vibration Monitoring: Continuous vibration sensors trigger an automatic drive shutdown if preset vibration limits are exceeded.
• Inert Gas Purge System: An optional nitrogen blanketing system maintains positive internal pressure of +200 Pa to +500 Pa, with oxygen monitoring for hazardous solvent processing. The oxygen concentration limit must be established according to the solvent properties and the verified process safety design.

To receive an engineering proposal and preliminary dimension drawing, please prepare the following process input parameters:

Slurry Characteristics: Liquid medium, solvent type, solid concentration (wt%), operating temperature, and liquid viscosity.

Solid Characteristics: Particle size range (d50), solid density, and slurry behavior under pressure.

Capacity Requirement: Expected solid output per batch (kg/batch) or required hourly production rate (kg/h).

Process Objectives: Target residual moisture limit (%) and required filtrate clarity.

Site Requirements: Hazardous area classification (explosion-proof or non-hazardous), available utility pressures (MPa), and power supply standards (V/Hz).

1. When should I choose a bag-type centrifuge over a scraper centrifuge?

Choose a bag-type centrifuge for APIs, battery materials, or products requiring more than 99% cake recovery and minimal cross-contamination.

2. Which filter bag material should I choose?

Polypropylene suits pH 1–13 and temperatures up to about 90°C. Polyester suits mild solvents and neutral media up to 130°C. PTFE is recommended for aggressive solvents and temperatures up to 200°C.

3. What is the typical lead time?

Stainless steel models typically ship within 60–90 days after the deposit. Hastelloy and duplex models usually take 100–130 days. ATEX or IECEx configurations add approximately 2–4 weeks.

4. What oxygen level should I use for flammable solvents?

For common solvents such as ethanol, methanol, IPA, and toluene, plants typically set the operating limit below 5% oxygen by volume, with an alarm at 8%.

5. Should I choose a direct-drive or V-belt model?

Choose direct drive for lower vibration, no belt dust, and easier pharmaceutical validation. Choose a V-belt drive when headroom is limited.

6. Which housing type is best for a multiproduct API plant?

A full clamshell housing is ideal for frequent changeovers because it provides full visual inspection and swab access within 30–60 minutes after cleaning.

7. How often should the main bearings be replaced?

Replace them every 3–5 years, or 25,000–40,000 operating hours. Quarterly vibration checks help identify replacement needs before failure.

8. Can you test my sample before I order?

Yes. We test 2–5 kg of slurry or wet solids and report cake moisture, filtration rate, and the recommended bag micron rating within 5–7 working days.

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