The Triple-Pass Rotary Drum Particleboard Dryer consists of three concentric cylinders of different diameters nested together in a rotary structure, complemented by a hot air furnace, feeding system, material collection system, and dust removal system, forming a complete particleboard drying production line. Adopting a high-temperature rapid drying process, this equipment features high drying intensity, short residence time, and high output, capable of meeting the raw material drying requirements of particleboard production lines with annual capacities of 30,000 to 200,000 cubic meters.

The equipment comprises three concentric cylinders—inner, middle, and outer—each equipped with specially designed lifting plates and material guide vanes.

Material Flow: Wet wood chips enter the inner drum from the feed end, where they are pneumatically conveyed in suspension by the high-temperature hot airflow for rapid drying. Upon reaching the end of the inner drum, the material turns back into the middle drum and flows in the opposite direction along the annular channel. It then turns again into the outer drum and is finally discharged from the outlet end. The total travel distance across the three drums is equivalent to three times the length of a single drum, while the equipment footprint is only approximately 40% of that of a single-pass dryer.

Hot Air Flow: Hot air generated by the furnace (approx. 700-800°C) flows sequentially through the inner, middle, and outer drums, fully exchanging heat with the material, and finally exits through the outlet into the dust collection system. The drying medium flows in the same direction as the material (co-current flow), with the outlet temperature dropping to approximately 125°C.

During the drying process, fine particles pass through quickly with the airflow, while heavier, wetter large chips fall back due to gravity and are repeatedly lifted by the lifting plates, re-entering the airflow. This results in different residence times for particles of varying sizes (approximately 8-20 minutes), achieving differentiated and uniform drying.

1. Three-Stage Drying with Extremely High Thermal Efficiency

The nested three-cylinder structure multiplies the material travel distance while significantly reducing heat dissipation surface. The equipment features self-insulation, with the outer drum wall temperature below 60°C and thermal efficiency reaching up to 80%, compared to only about 35% for traditional single-pass dryers.

2. Compact Structure, Small Footprint

The equipment length is approximately 60% shorter than single-pass dryers, with a footprint of only about 20 square meters, allowing flexible layout in production lines.

3. Unique Lifting Plate and Sealing Design

Features a spiral combined lifting plate structure and double-peak heads, ensuring material is evenly lifted and scattered to form a uniform material curtain, maximizing contact area with hot air. Equipped with lamella-type dynamic seals at the inlet and outlet to minimize air leakage.

4. Uniform Drying with Stable Moisture Content

Different-sized particles experience varying residence times—fine particles are discharged quickly, while larger wet particles are repeatedly lifted and dried—ensuring consistent output moisture content.

5. High Capacity, Wide Application Range

Single-unit capacity covers 1.5-10 tons/hour (wet material), with maximum capacity reaching 15 tons/hour. Suitable for various wood chips, sawdust, shavings, as well as bamboo shavings, crop stalks, and other biomass raw materials.

6. Fully Automatic Intelligent Control

Equipped with PLC control system and fuzzy logic controller, monitoring and automatically adjusting hot air temperature in real-time to ensure stable output moisture content.

7. Multi-Fuel Compatibility, Safe and Reliable

Heat sources can be coal, biomass pellets, natural gas, fuel oil, or sanding dust, adapting to various regional energy conditions. The system is equipped with fire prevention devices and explosion-proof design for safe and reliable operation.

1. Hot Air Furnace (coal/biomass/gas optional)

2. Feeding System (belt conveyor + screw feeder + feed chute)

3. Triple-Pass Rotary Drum (inner+middle+outer cylinders with lifting plates)

4. Transmission Unit (motor + reducer + gear/chain drive)

5. Discharging System (screw discharger)

6. Cyclone Dust Collector (primary material collection + dust removal)

7. Baghouse Filter/Wet Scrubber (secondary dust removal)

8. Induced Draft Fan and Ducting System

9. PLC Control Panel + Temperature Sensors + Touchscreen

Particleboard production lines

Medium Density Fiberboard (MDF) production lines

OSB (Oriented Strand Board) production lines

Biomass pellet fuel raw material pre-treatment

Large-scale wood chips and sawdust centralized drying

PB/OSB production lines

MDF production lines

Q1: What is the core difference between a triple-pass dryer and a single-pass dryer?

A: The triple-pass dryer features a three-layer nested concentric cylinder structure, providing 3 times the material travel distance while the equipment length is only about 40% of a single-pass dryer. Thermal efficiency reaches over 80%, compared to approximately 35% for single-pass units, resulting in significant energy savings.

Q2: What fuel options are available for this equipment?

A: Multiple fuel types are supported including coal, biomass pellets, natural gas, fuel oil, and sanding dust, adapting to different regional energy supply conditions.

Q3: What are the moisture content requirements for raw materials?

A: The equipment can process various wood chips and shavings with initial moisture content between 30%-65%, with output moisture content adjustable to 2%-5% based on process requirements.

Q4: What is the actual thermal efficiency of this equipment?

A: The triple-pass dryer achieves thermal efficiency of up to 80%, with outer drum wall temperature below 60°C, resulting in minimal heat loss.