Overview
The LW Series Horizontal Screw Discharge Sedimentation Centrifuge provides continuous solid-liquid separation using centrifugal force and screw discharge.
- Particle Size: >0.005 mm
- Feed Solids Concentration: 2–40%
- Operation: Continuous feeding, separation, and discharge
How the Separation Process Works
1. Feed Acceleration
The suspension enters through the feed pipe and accelerates before entering the rotating bowl.
2. Centrifugal Sedimentation
Centrifugal force drives heavier solids toward the bowl wall, while the clarified liquid moves toward the large-diameter end.
3. Continuous Discharge
The screw conveyor transports settled solids toward the conical end for discharge, while separated liquid exits through the liquid outlet.
LW Series Technical Specifications
|
Model |
Drum Diameter (mm) |
Drum Length (mm) |
Speed (rpm) |
Separation Factor (×g) |
Motor Power (kW) |
Weight (kg) |
Dimensions (mm) |
|
LW245×980 |
245 |
980 |
5,400 |
4,000 |
7.5–11 |
1,000 |
1898×1175×620 |
|
LW350×1550 |
350 |
1,550 |
3,700 |
2,683 |
22 |
2,400 |
2188×1083×1480 |
|
LW380×1520 |
380 |
1,520 |
3,500 |
2,610 |
22–30 |
2,800 |
2780×1820×1100 |
|
LW450×1800 |
450 |
1,800 |
3,000 |
2,260 |
30–37 |
3,800 |
3234×1730×1260 |
|
LW520×2080 |
520 |
2,080 |
3,000 |
2,620 |
37–45 |
5,000 |
4062×1248×1429 |
|
LW650×2400 |
650 |
2,400 |
2,400 |
2,094 |
90 |
7,800 |
5350×1715×1300 |
|
LW720×2880 |
720 |
2,880 |
2,100 |
1,778 |
132 |
9,200 |
5600×2900×1500 |
Model Selection Guide
Capacity and Solids Load: Define the required feed flow rate and dry-solids throughput to shortlist suitable models.
Particle Settling: Assess particle-size distribution, solids density, and liquid viscosity to evaluate separation requirements.
Separation Targets: Specify required centrate clarity, solids recovery, and discharged cake moisture.
Material and Wear: Consider feed temperature, corrosiveness, and abrasiveness when selecting wetted-part materials and wear protection.
Site Conditions: Check equipment dimensions, weight, power supply, and hazardous-area requirements.
Final Model Selection: Compare shortlisted models against both hydraulic capacity and dry-solids load. Confirm the final model and configuration using process data and, where necessary, representative feed testing.
Configuration Options for Different Process Conditions
|
Selection Item |
Available Options |
|
Wetted-Part Materials |
Standard stainless steel, special stainless steel, or titanium alloy. |
|
Drive System |
Electromagnetic speed-control motor, VFD-driven standard motor, or VFD-driven explosion-proof motor. |
|
Differential Speed |
Selectable range of 10–60 rpm, depending on the model and process requirements; differential speed affects solids conveying and residence time. |
|
Length-to-Diameter Ratio |
2–4.4, depending on model design. |
|
Screw Configuration |
Single-start or double-start, subject to process requirements. |
|
Design Requirements |
GMP-oriented design and manufacturing can be considered according to agreed project specifications. |
Material selection should account for chemical compatibility, operating temperature, corrosion, and abrasive solids. Drive selection should consider site power supply, speed-control requirements, and applicable hazardous-area classifications.
Where the LW Series Is Used
|
Industry |
Typical Separation Task |
|
Chemical Processing |
Recovery of settleable solids from chemical process liquids |
|
Environmental Treatment |
Dewatering of suitable industrial sludge containing separable solids |
|
Food Processing |
Separation of settleable solids from compatible process liquids |
|
Pharmaceutical Production |
Solid-liquid separation for compatible process streams under specified hygiene requirements |
|
Light Industry |
Continuous removal of suspended solids from suitable production liquids |
Manufacturing & Inspection
Dimensional Inspection: Check specified component dimensions and assembly interfaces against approved drawings.
Dynamic Balancing: Balance the bowl and screw assembly where applicable, according to the agreed technical requirements.
Assembly and Running Checks: Inspect assembly condition and perform no-load or functional tests where specified.
Material Verification: Verify specified materials and provide supporting material documents when included in the order scope.
Inspection Records: Available records may include dimensional inspection reports, dynamic balancing records, material documents, and agreed test reports, as applicable to the order.
Engineering Support
Model and Configuration Review: Review the proposed model, wetted-part materials, and drive options against the stated process requirements.
Technical Specification Confirmation: Confirm model specifications and agreed configuration details before order placement.
Layout Information: Provide equipment dimensions and weight for preliminary space and layout assessment.
Information Required for Equipment Selection
To evaluate a suitable LW model, please provide:
- Process Capacity: Required feed flow rate and operating hours.
- Feed Properties: Composition, particle-size distribution, solids concentration, liquid density, viscosity, temperature, and corrosiveness.
- Separation Targets: Required liquid clarity, solids recovery, and target cake moisture content.
- Site Requirements: Available power supply, explosion-proof requirements, and installation space.
- Project Specifications: Required materials, hygiene requirements, and applicable design standards.
If complete process data are unavailable, existing equipment details and representative feed samples may support a preliminary evaluation.
FAQ
Q: Can the LW Series separate solids with a low density difference from the liquid?
A: Separation performance depends on the feed properties and operating conditions, so representative material testing may be needed to assess challenging applications.
Q: What happens if the feed solids concentration fluctuates during operation?
A: Feed fluctuations can affect separation performance and solids discharge, so the expected operating range should be considered when confirming the equipment configuration.
Q: What acceptance criteria should be agreed upon before ordering?
A: The purchase agreement should define applicable performance targets, inspection requirements, test conditions, and required documentation before manufacturing begins.
Q: What inspection documents can be provided with the centrifuge?
A: Available documents may include dimensional inspection reports, dynamic balancing records, material documents, and agreed test reports, depending on the order scope.
Q: What should be confirmed before replacing an existing centrifuge?
A: Confirm the process requirements, equipment interfaces, installation dimensions, utility connections, and required performance before finalizing the replacement configuration.
Q: What should buyers prepare for pre-shipment inspection?
A: Buyers should agree on the inspection scope, acceptance criteria, required records, and any witness or third-party inspection arrangements before production is completed.
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