LLW Horizontal Screen Worm Centrifuges: Frequently Asked Questions for Industrial Buyers

Continuous solid-liquid separation is a core process in chemical, pharmaceutical, food processing and mining production. Horizontal screen worm centrifuges are widely adopted across these sectors for their high throughput, low energy consumption and stable automated operation. For procurement engineers, plant managers and technical operators, questions often arise around how these machines work, which materials they handle, and how to match the right configuration to production needs. This FAQ guide explains all key details of the LLW series conveyor discharge screen centrifuge strictly based on official product specifications, to support your evaluation and selection process.

Frequently Asked Questions

Q1: What is an LLW horizontal screen worm centrifuge, and how does it work?

The LLW series is a continuous-feed, conveyor-discharge screen centrifuge designed for industrial solid-liquid separation, cake dewatering and on-stream washing. It is characterized by low energy consumption, stable running performance and high separation efficiency, with a fully automated workflow from feeding to final discharge.

Its complete operating principle follows these sequential steps:

1. Feeding: Feed suspension enters the unit through a feed pipe, flows into the distribution chamber, and is injected into the rotating basket via openings near the conical tip of the screw conveyor.
2. Solid-liquid separation: Under centrifugal force, solid particles settle onto the inner screen wall of the basket, while clarified liquid passes through the screen mesh and exits via the overflow port.
3. Conveying and progressive dewatering: The screw conveyor rotates at a slight differential speed relative to the basket, pushing settled solids from the smaller-diameter end to the larger-diameter end. As basket diameter increases, centrifugal force rises accordingly, further dewatering the solid cake as it travels forward.
4. Discharge: Fully dewatered solids are continuously discharged from the large end of the basket.

The unit is also fitted with an integrated washing pipe for in-process cake washing; the thin cake layer delivers efficient washing results with low wash liquid consumption. Optionally, a steam pipe can be installed on the back of the basket to dissolve and clean crystallized materials at high temperature.

Q2: What are the core technical features of LLW screen centrifuges?

LLW series centrifuges are built for heavy-duty industrial operation, with the following key design advantages:

• Corrosion-resistant construction: Core components including the basket and screw conveyor are manufactured from high-quality corrosion-resistant stainless steel and titanium alloy, suitable for processing corrosive materials.
• Adjustable basket geometry: 10° and 20° basket angles are available to match different separation and washing requirements.
• Diverse screen options: Special metal plate filter mesh (0.4–0.5mm thickness) and trapezoidal wire forming mesh (4.5–5mm thickness) are optional for different particle sizes and abrasion levels.
• Stepless speed regulation: Variable-frequency control enables adjustable basket rotating speed to adapt to varying material properties.
• Fully continuous operation: Feeding, filtration, washing, dewatering and discharging run in an uninterrupted cycle, delivering large processing capacity.
• Comprehensive safety protection: Equipped with speed detection, over-vibration protection, motor overload and overheat protection for safe, reliable operation.
• Adaptable drive systems: Cycloidal, planetary and hydraulic gearboxes are available; the hydraulic gearbox is specifically recommended for high-viscosity materials.

Q3: What industries and materials are LLW centrifuges suitable for?

LLW horizontal screen worm centrifuges have broad application across chemical, pharmaceutical, food, mining and polymer industries. They perform best for dewatering crystalline, granular and short-fiber materials.

Typical verified applications include:

• Basic chemical industry: Adipic acid, ion exchange resin, calcium formate, sodium chloride, sodium nitrate, ammonium sulphate, copper sulphate, potassium chloride and other salt and crystal products.
• Pharmaceutical & fine chemical: Aspirin, citric acid, tartaric acid, borax, silver nitrate and other pharmaceutical intermediates and fine chemicals.
• Food & agro-processing: Edible salt, crystal soda, sodium formate and other food-grade crystalline materials.
• Polymer & plastics: Polystyrene, polyvinyl alcohol, plastic granules, methyl cellulose and other polymer products.

Q4: 10° vs 20° basket angle: which one should I choose?

Basket angle directly affects solid residence time, conveying resistance and washing effect. The two standard angles are engineered for different process priorities:

• 10° basket angle: The preferred choice when cake washing is required. The smaller angle extends the retention time of solids inside the basket, ensuring sufficient contact between wash liquid and the cake layer for more thorough washing results.
• 20° basket angle: The standard configuration for most general separation tasks. Solids slide naturally from the small end to the large end under increasing centrifugal force, requiring less pushing force from the conveyor. It delivers higher throughput for materials that do not need intensive washing.

Q5: How do I select the right LLW centrifuge model for my production?

Model selection should be driven by your required processing capacity, material properties and on-site installation conditions. The LLW series includes 7 standard models covering a wide capacity range:

Core selection principles:

1. Match the model’s capacity range to your hourly throughput requirement, with appropriate redundancy for peak production loads.
2. For fine particles or hard-to-dewater materials, prioritize models with higher centrifugal force.
3. For high-viscosity materials, select a configuration with a hydraulic gearbox for stable and reliable conveying.
4. Verify equipment dimensions and weight against your available installation space and floor load capacity.

Q6: What custom configuration options are available?

The LLW series supports flexible customization to fit specific process requirements:

• Gearbox type: Cycloidal gearbox, planetary gearbox or hydraulic gearbox, selected based on material viscosity and conveying resistance.
• Screen type: Metal plate mesh or trapezoidal wire mesh, matched to material particle size and abrasiveness.
• Lubrication system: Grease lubrication or thin oil lubrication, both simple in structure and reliable in operation.
• Auxiliary systems: Cake washing assembly, basket back steam cleaning system, and additional safety monitoring devices.

Summary

LLW horizontal screen worm centrifuges provide a reliable, energy-efficient solution for continuous industrial solid-liquid separation, with flexible configurations, wide material compatibility and fully automated operation. By clarifying your capacity requirement, material properties and washing needs, you can select the optimal model and configuration to improve production efficiency and reduce long-term operating costs.

For a more targeted sizing recommendation based on your specific material and process parameters, contact our technical team for a customized separation solution.

Disclaimer

The technical parameters, performance descriptions and application cases provided in this article are for general reference only. Actual product performance and separation results may vary due to specific feed material properties, inlet concentration, operating conditions and custom configurations. For detailed product specifications and project-specific solutions, please consult our professional technical personnel.