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Precautions for Using Polyurethane Dewatering Screen Panels in Coal Washing Plants
Precautions for Using Polyurethane Dewatering Screen panels in Coal Preparation Plants
Polyurethane dewatering screen panels are widely used in coal washing plants for coal dewatering, de-mediuming, and classification due to their advantages of wear resistance, corrosion resistance, and high elasticity. However, to maximize their value, comprehensive lifecycle management must be implemented, taking into account production conditions, equipment characteristics, and material properties. The following details key considerations across five critical phases—selection, installation, operation, maintenance, and storage—to help users enhance efficiency and extend equipment lifespan.
- Selection Phase: Precisely Matching Operational Requirements
Select based on coal quality characteristics:
High-moisture, high-viscosity raw coal (moisture >15%): Prioritize large cone angle (120°-140°) and specialized hole patterns (e.g., fish scale, wave-shaped) to prevent clogging through secondary vibration.
High-hardness, high-impurity raw coal: Opt for wear-resistant screen panels with nano-reinforced, thickened substrates to prevent accelerated wear.
Adapting to Screen Machine Parameters:
Match vibration frequency (800-1500 r/min) and amplitude (3-8 mm) to avoid excessive screen plate fatigue.
Customize based on effective screening area and installation slot dimensions to ensure ≥95% fit accuracy, preventing displacement or detachment.
Define Process Requirements:
Coal de-mediuming: Select elongated aperture patterns with high sealing properties, matching aperture size to medium particle size (0.1-0.3mm).
Fine-grain classification: Employ high-precision aperture patterns with low-friction screens, maintaining dimensional tolerance within ≤5%.
II. Installation Phase: Standardized Procedures Ensure Stability
Pre-installation preparation:
Clear coal slurry and debris from track grooves. Inspect groove deformation; repair any wear exceeding 2mm depth.
Inspect screen plate surfaces for cracks, blistering, or aperture distortion. Ensure thickness and aperture deviation ≤0.5mm.
Post-Installation Inspection:
Manually push the screen plate to confirm no looseness. Run idle for 30 minutes to observe for abnormal noise or displacement.
Conduct a material test to check material distribution and screening efficiency, ensuring no clogged apertures or material leakage.
- Operational Phase: Real-Time Monitoring to Mitigate Risks
Operational Monitoring:
Conduct inspections every 2 hours. Use compressed air (0.4-0.6MPa) to clear clogged apertures; sharp tools are prohibited.
Record screen current and noise levels. Shut down for inspection if current exceeds rated value by 10% or noise exceeds 80 decibels.
Load Control:
Limit feed rate to no more than 90% of the screen's rated capacity to prevent overload.
Install a distributor to ensure even material distribution, preventing localized thickness exceeding 100mm that causes wear.
Environmental Protection:
Regularly inspect sealing strips and promptly replace aged components to prevent coal slurry water infiltration.
In corrosive environments, select hydrolysis-resistant and corrosion-resistant screen panels, and perform regular clean water rinses.
IV. Maintenance Procedures: Regular Care Extends Lifespan
Daily Maintenance:
After each shift, rinse screen panels with a high-pressure water gun (1-2MPa), avoiding impact on joint seams.
Weekly bolt tightness checks; monthly screen plate thickness measurements. Prepare replacements when wear exceeds 30%.
Fault Handling:
Fill localized cracks with polyurethane repair compound; test after 24-hour curing. Replace immediately if cracks exceed 100mm.
For extensive clogging, verify aperture compatibility; replace screen panels if necessary.
Periodic Replacement:
Under standard conditions, service life spans 6-12 months. Replacement is recommended upon expiration to prevent efficiency decline.
Used screen panels should be categorized for storage. Locally worn sections may be repurposed for non-critical applications to enhance resource utilization.
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