Feedstock: Raw Wood Logs, Wood Chips, and Forestry Residues
Process: Continuous Rotary Pyrolysis + Homogenized Mixing + Mechanical Punching Extrusion
Final Product: High-Density Hexagonal/Cylindrical Charcoal Sticks (Fixed Carbon >85%)
The core of this facility is the thermal transformation of bulk wood waste. Raw materials are fed into the Continuous Carbonization Furnace.
Dynamic Rotary Logic: Unlike static batch kilns or vertical retorts, the horizontal rotary drum ensures that wood particles are constantly agitated in an anaerobic environment. This mechanical action prevents material bridging and ensures 100% uniform carbonization.
Thermal Autonomy: Combustible syngas produced during pyrolysis is captured, purified, and redirected back to the burners. Once the system reaches the required temperature, it becomes nearly self-sustaining, drastically lowering operational fuel costs.
Stabilized Output: Carbonized charcoal is extracted through a water-cooled screw conveyor, reducing temperatures to below 40°C for safe immediate handling.
To achieve export-grade charcoal strength, the carbonized powder must be properly conditioned.
Homogenization: The charcoal fines enter a Double-Shaft Mixer, where a specific ratio of water and organic binders (such as starch) is introduced.
Shear Force: The synchronized paddles provide high-intensity mechanical shear, coating every particle with binder. This eliminates internal air pockets, which is critical for preventing the final sticks from cracking during combustion.
The conditioned mixture is delivered to the Mechanical Charcoal Punching Machine for the final forming stage.
Mechanical Punching vs. Screw Extrusion: Unlike friction-heavy screw extruders, the punching mechanism uses a high-frequency reciprocating piston to force material through an alloy die.
Density & Finish: This impact-based compression achieves a high density (>=1.3g/cm^3), resulting in a “metallic” clink and a smooth, glossy surface finish.
Industrial Hardening: Freshly extruded sticks are transitioned to a Multi-Layer Mesh Belt Dryer to reduce moisture to <=5%, ensuring a smokeless and spark-free burn for the end-user.
Q1: Why use a Rotary Drum for wood chips instead of a Vertical Retort?
A: Rotary drums are specifically engineered for loose, granular biomass. The mechanical flipping action solves the “cold spot” problem common in vertical designs, ensuring that every wood chip reaches the optimal pyrolysis temperature for high fixed carbon.
Q2: What is the benefit of the “Punching” method for charcoal sticks?
A: Mechanical punching produces a higher structural density than screw extrusion. This means a longer burn time and higher resistance to breakage during long-distance shipping, making it the preferred choice for premium shisha and BBQ markets.
Q3: How does the plant handle environmental emissions?
A: The system includes multi-stage dust removal and tar recovery. By recycling the combustible gases back into the combustion chamber, the plant achieves near-zero smoke emissions, meeting strict industrial environmental standards.
[Consult with an Engineer: Calculate the Thermal Balance & Energy Recovery Rate for Your Feedstock]
