Optimizing Refining Process for High-Quality Kraft Linerboard Production
Pulping System Design for Modern Kraft Linerboard Production
Kraft linerboard production demands a pulping system that balances throughput, fiber quality, and energy consumption. Modern OCC pulping lines operating at 300-600 TPD must achieve consistent stock quality while minimizing fiber damage and energy use. The right equipment configuration directly impacts final board strength properties including burst index, ring crush, and STFI.
Technical Specifications: Leizhan OCC Pulping Line
- Hydraulic Pulper: 200-600 TPD capacity, 4-6% operating consistency, 132-500 kW motor power
- Pressure Screen (Primary): 0.25-0.35mm slotted screen basket, reject rate <15%, fiber recovery >95%
- Double Disc Refiner: 660/910/1100mm disc diameter, 250-900 kW motor, energy saving 15-20% vs conventional
- Disc Thickener: 300-500 TPD throughput, outlet consistency 12-15%, filtrate clarity <200 ppm
Energy Optimization: Where the Savings Come From
Conventional OCC pulping lines typically consume 45-55 kWh per ton of pulp. Modern system design with high-efficiency refiners and optimized screening reduces this to 35-42 kWh/ton. The Leizhan Double Disc Refiner reduces refining energy by 15-20% through improved plate geometry and hydraulic loading. For a 400 TPD mill, annual electricity savings approach approximately 50,000 at /usr/bin/bash.08/kWh.
Maintenance Recommendations
- Pulper rotor and extraction plate: Inspect every 1,200 operating hours; replace extraction plate at 8,000-10,000 hours
- Screen basket and rotor: Check slot width monthly; typical basket life 12-18 months with proper pre-screening
- Refiner plates: Monitor specific energy (kWh/t) trend; plate change when energy increases 15% above baseline
- Bearings and seals: Grease every 500 hours; full bearing inspection at annual shutdown
Process Integration Considerations
A well-integrated OCC system includes feed conveyor, pulper, dump chest, high-density cleaner, coarse screen, fractionator, primary and secondary pressure screens, disc thickener, refiner, and approach flow system. Leizhan systems consistently deliver 92-95% fiber recovery when pulper extraction plate (8-12mm holes) and pressure screen slot size are properly matched to furnish quality.
For technical consultation and equipment quotation, contact our engineering team.
Email: leizhanzhang@gmail.com