A straw charcoal machine uses pyrolysis technology to convert agricultural residues, such as straw, rice husks, and corn stalks, into biochar by heating biomass under oxygen-limited conditions. The biochar produced meets European Biochar Certificate (EBC) standards and can be used as a soil amendment, with potential benefits for long-term carbon removal. Compared with open-field burning, this technology provides a more sustainable way to manage agricultural residues, promoting resource recovery, sustainable agriculture, and climate change mitigation.
How a Straw Charcoal Machine Works
Like other biochar production equipment, a straw charcoal machine works in six stages: pretreatment, feeding, pyrolysis, syngas recycling, cooling and discharging, and exhaust treatment.
Step 1: Pretreatment
Agricultural straw is dried and crushed so that its moisture content and particle size meet the feeding requirements (moisture ≤ 15%, particle size ≤ 20 mm).
Step 2: Feeding
The prepared straw is loaded into the silo and carried by a screw conveyor into the inner cylinder of the reactor.
Step 3: Pyrolysis
Inside the oxygen-limited reactor, the straw is heated indirectly to 380–450 °C. Decomposition starts at around 150 °C, releasing gases such as CO and CO₂. Carbonization proceeds as the temperature approaches 350 °C and above, producing biochar continuously.
Step 4: Syngas Recycling
The combustible syngas released during pyrolysis is purified and sent back to the combustor to heat the reactor, which reduces the need for external fuel.
Step 5: Cooling and Discharging
The biochar is cooled by indirect water cooling through a heat exchanger and discharged at a temperature below 45 °C.
Step 6: Exhaust Treatment
After heat is recovered from the exhaust gas, a dedusting and gas treatment system (for example, a cyclone dust collector and a spray scrubber) removes particulate matter and harmful components such as sulfur compounds before the gas is released.
Parameters of Straw Charcoal Machine for Sale
BST-50: Industrial-Scale Model
- Pyrolysis technology vetted by Puro.earth, Isometric, and Rainbow
- 6,000 tons of biochar with 12,000 tons of CO₂e sequestration per year
- 7,200 operating hours per year
BST-06Quicker: Small Pilot-Scale Model
- Pyrolysis technology vetted by Rainbow
- Mobile design and rapid on-site installation within 8 hours
- CDR feasibility validation within 90 days
| Model | BST-50 Standard | BST-50 Max | BST-50S | BST-06 Quicker |
|---|---|---|---|---|
| Operating Mode | Continuous | Continuous | Continuous | Continuous |
| Application | Commercial-scale | Commercial-scale | Commercial-scale | Pilot Testing |
| Certification Platform | Isometric, Rainbow | Isometric, Rainbow | Puro.earth, Isometric, Rainbow | Rainbow |
| Reactor Material | Staineless Steel 304 | Staineless Steel 304 | Staineless Steel 310s | Staineless Steel 304 |
| Feedstock Moisture | Below 15% | From 15% to 55% | From 15% to 55% | Below 15% |
| Feedstock Size | 5-20mm | 5-20mm | 5-20mm | 5-20mm |
| Feeding Capacity (only for pyrolysis) | 10-15m³/h | 10-15m³/h | 10-15m³/h | 100-200KG/H |
| Max. Pyrolysis Temperature (Combustion Chamber) | 650℃ | 650℃ | 700℃ | 650℃ |
| Residue Retention Time | 15-20 minutes | 15-20 minutes | 15-20 minutes | 15-20 minutes |
| Operating Pressure | -20 - 0 pa | -20 - 0 pa | -20 - 0 pa | -20 - 0 pa |
| Cooling Method | Water | Water | Industrial Refrigeration Units | Water |
| Exhasut Gas Treatment | Standard | Standard | High Performance | Standard |
| Biochar Temperature | 45℃ | 45℃ | 45℃ | 45℃ |
| Annual Operating Hours | ＞7200hrs | ＞7200hrs | ＞7200hrs | ＞7200hrs |
| Service Life | 5-8 years | 5-8 years | 8-10 years | 5-8 years |
| Land Space Required (L*W*H*m) | 35*15*8 | 65*15*8 | 65*15*8 | 35*15*8 |
| Power Consumption | 121kw/h | 270-288kw/h | 270-304kw/h | 25.1kw/h |
| Water Consumption | 5-7m³/day | 5-7m³/day | 0 | 3-5m³/day |
| Fuel Consumption | 220-260m³/h | 220-260m³/h | 220-260m³/h | 30-50m³/day |
| Installation Period | 60 days | 60 days | 60 days | 7 days |
Biomass Pyrolysis Technology Vetted by Puro.earth, Isometric, and Rainbow
Key Advantages for CDR Project Developers
Clearer Path to Carbon Credits
Carbon removal projects using biomass pyrolysis equipment vetted by Puro.earth, Isometric, and Rainbow can follow those platforms’ established methodologies to quantify carbon storage and apply for credit issuance.
Faster CDR Project Validation
BST-50 and BST-06Quicker pyrolysis models have already been vetted by leading carbon removal registries, so developers may not need to prove the technology from scratch. Existing technical documents can also be reused in project design and validation.
More Credible to Credit Buyers
Credit buyers and investors often check whether the biochar production technology has been independently reviewed. Third-party vetting provides fully verifiable compliance documentation.
| Certification platform | Date of Vetting | Models Covered | Supporting Documents |
|---|---|---|---|
| Puro.earth | Dec 2024 | BST-50S | Puro.earth Evaluation Statement |
| Isometric | Feb 2026 | BST-50 | Contact us for details |
| Rainbow | Jul 2026 | BST-50 |