Industrial Flat Die Wood Pellet Mill | Biomass Pellet Making Machine

The wood pellet mill is a piece of biomass energy equipment designed for pellet production. It processes raw materials such as eucalyptus, birch, poplar, fruitwood, bamboo shavings, and crop residues into finished wood pellets through crushing, drying, screening, pelletizing, cooling, and packaging. The end products are widely used in biomass power generation, boilers, fireplaces, and household equipment.

The flat die wood pellet mill is industrial pelletizing equipment utilizing crude fiber materials like wood chips and straw. It is primarily applied in biomass fuel, feed processing, and organic fertilizer production. The equipment features a synchronous design with a conical roller and a flat die, physically extruding loose materials into 2.5-10mm diameter round rods, blocks, or pellets, adapting to various raw material characteristics.

The core structure includes a screw center pressure adjustment mechanism, allowing flexible die clearance adjustment to optimize molding. The quick-release die design supports multiple repairs, extending the service life. Equipped with an automatic lubrication system and a 3-55kW motor drive, it delivers a capacity of 200-300 kg/h. It is ideal for civil heating, industrial boilers, and biomass power generation. Compared to ring die models, the stationary flat die operation improves the pelletizing rate and lowers energy consumption.

Key Features

• Conical roller design: Keeps consistent linear speed between the roller ends and the die's inner/outer rings. This eliminates dislocation friction, reduces resistance and kinetic energy loss, and extends die lifespan.
• Screw center pressure adjustment mechanism: Flexible die clearance adjustment accommodates different materials and ensures optimal pressing results.
• Large, wide-grooved rollers: Offers high pressure-bearing capacity and wear resistance. Unlike ring die machines constrained by die diameter, the flat die design allows for enlarged rollers, avoiding small bearing chambers and frequent damage.
• Multiple uniformly distributed rollers: Ensures stable operation, increases the pressing area, and boosts production efficiency.
• Versatile molding capabilities: Produces pellets ranging from 2.5mm to 15mm by simply changing dies, maximizing adaptability and profitability.
• Observation door: Built into the pelletizing chamber for convenient inspection and maintenance.

Product Advantages

• Enhanced pressure capacity: Enlarged rollers allow for larger bearings, strengthening the overall load-bearing capability.
• Optimized temperature control: Reduces heat transfer to the bearing chamber during extrusion, ensuring lubricating grease functions properly at lower temperatures without overflow.
• Extended lifespan & cost efficiency: Enlarged rollers can be repaired 2-3 times, prolonging equipment life, reducing production costs, and increasing profit margins.

Technical Specifications

Operational Guidelines

Pre-startup Preparation

• Personnel & Safety: Operators must read the manual, wear tight work clothes, hard hats, and dust masks. Gloves are strictly prohibited.
• Equipment Inspection: Check the tightness of fasteners and drive belts. Manually rotate the rotor to ensure no jamming. Verify the motor is securely grounded.
• Material Pre-processing: Keep wood chip moisture content between 12%-18%. Screen out iron, sand, and hard debris.
• Machine Break-in: Run new machines at 30% load for the first 20 hours. Repeatedly grind die holes with a mix of wood chips, waste oil, and fine sand until discharge is smooth.

Operation Process

• No-load Startup: Start empty for 2-3 minutes. Once confirmed normal, gradually add feed (initial feed under 20% capacity).
• Clearance Adjustment: Adjust roller-die clearance to 0.1-0.3mm to prevent rigid contact damage. Fine-tune pressure (8-12MPa) based on material hardness.
• Uniform Feeding: Maintain consistent feeding to avoid continuous overload. Regularly clean metal debris from the magnetic separator.
• Condition Monitoring: Monitor vibration, noise, and bearing temperature. Shut down and disconnect power immediately if anomalies occur.

Shutdown & Maintenance

• Proper Shutdown: Feed oily material for 1-2 minutes to clear residual wood chips before stopping. Turn off the feeder, main engine, and main power in sequence.
• Routine Maintenance: Inspect roller lubrication every 50 hours. Clean die carbon deposits every 200 hours (ultrasonic cleaning can extend die life by over 20%).
• Accessory Matching: Select die hole diameter and compression ratio based on material (e.g., hardwood requires 6-8mm holes and a 1:5-1:6 ratio).

Troubleshooting

• No/Low Output: Check for blocked die holes or excessive clearance. Adjust material moisture to the correct range.
• Loose Pellets/High Dust: Slightly increase material moisture. Ensure the compression ratio meets standards. Replace dies if wear exceeds 0.2mm.
• Abnormal Noise: Stop immediately to check for hard debris. Replace damaged bearings and tighten loose components.