Wood Chip Roller Dryer

The Wood Chip Roller Dryer is a specialized equipment that utilizes heat and mass exchange between hot air and wet wood chips to efficiently and rapidly remove a large amount of moisture. It transforms wet wood chips with high moisture content (typically above 30%-50%) into qualified raw materials with stable moisture content (usually 10%-15%). It serves as a crucial pre-treatment step in the wood pellet fuel production line.

Working principle

The wood chip dryer primarily operates based on the principles of rotary drums and hot air conduction. The specific process is as follows:

1. Heating and feeding: Clean high-temperature hot air generated by a hot-air furnace (burning biomass, natural gas, etc.) is sent into the rotary drying drum. Simultaneously, wet sawdust is evenly fed into the inlet end of the drum through the feeding device.

2. Material lifting and dispersion: The drum rotates at a constant speed driven by the drive device, and multiple sets of rakes are installed on the inner wall of the drum. As the drum rotates, the rakes continuously lift and disperse the wood chips, forming a uniform material curtain to allow them to fully contact with the hot air.

3. Heat and mass exchange: High-temperature hot air undergoes intense heat and mass exchange with dispersed and suspended wet sawdust. The sawdust absorbs heat, causing the moisture on its surface to rapidly evaporate and be carried away by the hot air.

4. Exhaust and Discharge: The exhaust gas, which has become low-temperature and high-humidity after evaporation, is extracted from the other end of the drum by an induced draft fan and discharged after dust removal. The dried and qualified sawdust is discharged from the discharge end and enters the next process.

Main features

1. Large processing capacity and high drying efficiency

Adopting a drum-type structure, it allows for continuous feeding and discharging, with a single machine processing capacity ranging from several tons to tens of tons per hour, meeting the needs of large-scale industrial production.

2. Even drying and stable quality

The unique plate-copying design and roller rotation enable the wood chips to be repeatedly scattered and crushed, ensuring that every single chip can come into contact with the hot air, effectively avoiding issues of uneven drying or localized over-wetting.

3. Low energy consumption and controllable operating costs

The thermal energy is directly in contact with the wood chips, resulting in high heat exchange efficiency. At the same time, various low-cost heat sources such as boiler flue gas and biomass combustion can be utilized, achieving significant overall operational economy.

4. Robust structure, good adaptability

The key components of the equipment are made of wear-resistant and high-temperature resistant materials, which can adapt to the wear and high-temperature environment caused by wood chips. It operates smoothly, has a long service life, and has a certain adaptability to fluctuations in the moisture content of raw materials.

Technical parameters