Material: Reed Stalks (Agricultural/Wetland Biomass)
Process: Integrated Size Reduction, Thermal Dehydration, and Continuous Pyrolysis
Final Product: High-fixed-carbon reed biochar powder
Reed stalks are characterized by their hollow structure and high moisture content when harvested. To ensure a stable carbonization process, the stalks first undergo size reduction via industrial grinders to achieve a uniform particle size (<30mm).
Because raw reed stalks often exceed 25%–30% moisture, they are channeled into a Rotary Drum Dryer. This pre-conditioning stage reduces moisture to <=15%, which is critical for maintaining the thermal balance inside the furnace and preventing “smoke” caused by excess water vapor.
The dried reed fines are fed into the Continuous Carbonization Furnace. Guoxin Machinery emphasizes that this is a Continuous Rotary Drum system, distinct from vertical or lifting-style kilns, designed for 24/7 automated operation.
Pyrolysis Logic: As the drum rotates, the reed material is evenly heated in an oxygen-free environment. This constant agitation prevents the light fibers from “clumping” and ensures every particle reaches the required carbonization temperature.
Syngas Recovery: During the pyrolysis phase, the reeds release combustible volatiles (syngas). Our system captures this gas, purifies it through a multi-stage filtration unit, and redirects it back to the furnace burners. This creates a self-sustaining thermal cycle, drastically reducing operational fuel costs.
The carbonized reed powder is highly reactive and must be cooled before exposure to the atmosphere to prevent spontaneous combustion.
Water-Cooled Discharge: The finished charcoal powder is extracted via a sealed, water-cooled screw conveyor.
Output Consistency: The powder is discharged at <40°C, maintaining a high fixed carbon content (>80%) and a porous structure ideal for soil amendment or as a precursor for activated carbon.
For industrial-scale biomass plants, the carbonization furnace serves as the “thermal core,” but its efficiency relies on integrated upstream and downstream modules:
Upstream: Large-scale projects, such as those we have completed in Sri Lanka, utilize high-capacity Mesh Belt Dryers to handle high volumes of raw biomass before it enters the carbonization stage.
Downstream: The resulting reed charcoal powder is frequently moved to our Charcoal Briquette Press Machines to be formed into high-density fuel logs or BBQ briquettes for the retail market.
Q1: Why is gas recovery essential for reed stalk processing?
A: Reed stalks have a high volatile content. By capturing these gases instead of venting them, you not only meet environmental emission standards but also generate enough thermal energy to power the furnace, achieving near-zero fuel consumption after the initial pre-heating.
Q2: Can the system handle whole reed stalks without crushing?
A: No. For a Continuous Rotary Drum Carbonization Furnace, the material must be crushed to ensure uniform heat penetration. Whole stalks would lead to uneven carbonization and could potentially jam the automated feeding system.
Q3: What is the expected yield of biochar from reed stalks?
A: Typically, the yield is 3:1to 4:1, meaning 3–4 tons of raw reed stalks produce approximately 1 ton of high-purity charcoal powder, depending on the initial moisture and fixed carbon requirements.
[Consult with an Engineer: Design a Continuous Carbonization Plant for Agricultural Residues]
