Trial Overview

Trial Date: September 25, 2026

• Location: Guoxin Heavy Equipment Testing Workshop
• Raw Materials: Raw Timber Sticks/Branches, Crushed Coconut Shells
• Core Machinery: Heavy-Duty Dual-Shaft Shredder, Inclined Belt Conveyor, Continuous Rotary Carbonization Kiln, Stainless Steel Syngas Recycling System, Central PLC Control Cabinet
• End Product: High-Fixed-Carbon Wood Biochar Flakes & Coconut Shell Charcoal

1. Raw Material & Processing Goals

Forestry residues (raw timber sticks, branches) and agricultural waste (coconut shells) present distinct physical challenges during large-scale carbonization:

• Irregular Feed Size: Long timber sticks cause feed hopper bridging and jam continuous reactor screws if not sized properly beforehand.
• Volatile Matter Management: Rapid thermal decomposition of wood chips and coconut shells releases large volumes of combustible gases that require precise draft control and thermal recycling.

This workshop trial evaluated the entire process flow: preliminary size reduction -> continuous feeding -> thermochemical carbonization -> syngas combustion-> sealed cooling discharge.

2. On-Site Trial Step-by-Step

Step 1: Heavy-Duty Wood Shredding

Workers unloaded long timber branches directly into the feed chute of the dual-shaft shear shredder. Counter-rotating alloy knife shafts sheared the raw wood into uniform chips, discharging them onto an inclined belt conveyor without rotor stalling.

Step 2: Conveyance & Reactor Loading

The shredded wood chips and crushed coconut shells were loaded onto the main inclined belt conveyor leading to the sealed reactor inlet. Operators verified feed rate uniformity to ensure steady material movement through the internal retort.

Step 3: Syngas Recirculation & Self-Sustaining Combustion

As reactor temperatures reached pyrolytic thresholds, volatile gases (CO,CH_4) were drawn through the stainless steel ductwork, purified, and redirected to the external burner array. A steady, high-temperature flame was established at the burner nozzle, demonstrating energy self-sufficiency without reliance on external auxiliary fuel during steady-state operation.

Step 4: Automated PLC Monitoring & Sealed Discharge

The central PLC touchscreen tracked real-time heating zone temperatures, drum rotation speed, and system pressure. At the discharge end, fully carbonized charcoal pieces passed through a sealed water-cooled discharge screw, yielding uniformly blackened, dense biochar flakes with zero unburned core.

3. Line Technical Specifications

4. Key Performance Verification

1. Effective Size Reduction: The dual-shaft shredder reduced bulky timber branches into uniform wood chips suitable for continuous screw feeding and rapid pyrolysis.
2. Stable Thermal Balance: Recovered syngas provided consistent thermal energy back to the combustion chamber, reducing overall operating fuel costs.
3. Multi-Feedstock Versatility: The system transitioned between wood chips and coconut shells without requiring mechanical re-configuration, yielding high-grade biochar across both feedstocks.