How to Choose a Screen for an Efficient Pulverizer? Key Considerations in Biomass Pellet Production
In biomass pellet production, the selection of screens for efficient pulverizers is crucial. As a core component of the pulverizer, the screen directly impacts raw material pulverization efficiency, pellet quality, and production costs. Given the diverse raw materials, stringent particle size requirements, and rapid equipment wear in actual production, the following key factors should be considered when selecting a screen
Identify Raw Material Characteristics and Pulverization Requirements
Biomass raw materials (such as straw, wood chips, and rice husks) vary greatly in hardness and fiber structure, so the screen aperture and material should be selected based on these characteristics.
Aperture Selection: For raw materials with fine fibers (such as straw), a larger aperture is recommended to prevent over-pulverization. For hard raw materials (such as wood chips), a smaller aperture is recommended to ensure uniform pellets.
Material Compatibility: For hard raw materials, wear-resistant alloy screens are recommended to extend service life. For soft raw materials, ordinary carbon steel can be used to balance cost and efficiency.
Focus on Screen Structure and Strength Design
The structure and strength of the screen directly impact pulverization efficiency and equipment stability.
Mesh Shape: Square holes are suitable for fibrous raw materials, reducing entanglement and clogging; round holes are more suitable for hard granular materials, improving pulverization uniformity.
Thickness and Support: The screen thickness must match the pulverizer speed. Thicker screens are suitable for high-speed pulverizers to prevent vibration cracking. Furthermore, the back of the screen should be reinforced with ribs to prevent deformation during long-term operation.
Balancing Production Efficiency and Maintenance Costs
While ensuring quality, the frequency of screen replacement and production costs must be considered comprehensively.
Replaceability and Adaptability: Prefer modular screens for quick and easy replacement. Ensure they are fully compatible with the pulverizer model to avoid secondary modifications.
Matching Replacement with Production Capacity
Situations in Which Replacement is Necessary:
Deformation or damage of the screen (resulting in uneven coarseness of the raw material).
A decrease in production of more than 20% (increased wear of the screen holes leads to increased return).
Abnormal equipment vibration (caused by screen imbalance).
Deformation or damage of the screen (resulting in uneven coarseness of the raw material).
A decrease in production of more than 20% (increased wear of the screen holes leads to increased return).
Abnormal equipment vibration (caused by screen imbalance).
Capacity Matching: Select an appropriate screen area and aperture ratio based on the pulverizer model and expected output to avoid capacity reduction due to excessive screen density.
Conclusion
Although small, the screen is the core guarantee for efficient pulverization and high-quality pellet production. Biomass pellet companies must comprehensively evaluate multiple factors, including raw material characteristics, equipment compatibility, and cost control, to select the screen that best suits their production needs to achieve both efficiency and profitability.