CarboFlow
CarboFlow is Onnu's proprietary carbonization machine - designed and engineered with the aim to make pyrolysis commercially viable for more projects.
Key Features
CarboFlow sets a new standard in carbonization technology, delivering unmatched value and performance for every project. Deploying several key innovations, it has been designed to maximize biochar production and increase automation to make sites more successful.
Affordable
Projects using CarboFlow achieve payback in half the time of other projects.
Versatile
CarboFlow is able to pyrolyze a broad range of feedstocks.
High-Capacity
Throughput of up to 750 kg/hr, and easily scaled up or down.
Pyrolysis with Ambition
CarboFlow uses an upright design where airflow keeps the lower carbonization chamber oxygen-free while syngas is combusted above, radiating heat downwards.
As an experienced project developer, Onnu understands that pyrolysis operations needs to stack up financially. By increasing throughput, increasing automation and capturing green energy, plants using our technology can run efficiently and reliably which all leads to a financially sustainable operation.
CarboFlow contains many key innovations aimed squarely at increasing productivity to make projects work harder.
How it works
Dried biomass feedstock enters the CarboFlow carbonization unit via a dual feed auger system. Rotary valves release measured quantities of the feedstock into the lower chamber. Here, in a high temperature, low-oxygen environment, the feedstock undergoes continuous pyrolysis and is transformed into biochar and syngas.
While the biochar is quenched and discharged into bunkers, the released syngas is passed into the upper chamber where it is combusted. The green energy from the hot flue gases is captured and can power heat applications or electricity generation through ORCs. The spent flue gases are then passed through a scrubbing system to ensure no harmful emissions are released into the atmosphere.
Key Specs
Engineered for efficiency, designed for impact - CarboFlow delivers consistent performance for any scale of pyrolysis project.
Want to discuss a project?
Our experts can advise on feedstocks, sites and all aspects of a successful carbonization project.
CarboFlow Innovations
High-Capacity Feedstock Drive
Our unique feedstock drive handles a wide range of inputs, from woodchip and forestry residues to low‑density materials like AD digestate. This versatility comes from 20 individual auger drives that agitate the feedstock for consistent flow and uniform heating. The result is a flexible system that reliably produces clean energy and high‑carbon outputs.
Maximizing Green Energy Capture
Our system combusts syngas above the carbonization chamber to generate green energy with minimal losses. Wrapped in water jackets, the chamber’s excess heat is also captured as hot water. With our large pyrolysis area, we increase syngas production, closing the loop on waste and transforming every bit of biomass into valuable outputs.
Data & Automation You Can Rely On
Smart cameras and image recognition monitor feedstock and biochar, assessing particle size, temperatures and moisture in real time. Advanced controls then adjust feed rates, auger speeds, and discharge settings for optimal performance, with structured alarms to quickly flag and resolve issues.
A central touchscreen provides full visibility and instant control, with remote access for convenience. All process data is stored and analyzed in the cloud, enabling continuous optimization and seamless integration with your chosen MRV platform.
Minimize Footprint, Maximize Throughput
Designed in a rectangular chamber with two side feeders, CarboFlow is modular with all components designed to fit into two standard containers. On-site assembly is straightforward, allowing for efficient delivery and commissioning, getting projects up and running sooner.
Whole plant solutions
Onnu can design and deliver the entire plant from feedstock in, to biochar out, adhering to the highest standards throughout.
This can include walking floors, conveyors, dryers, feed systems, heat exchangers, ORCs, scrubbers, cyclones and bagging systems as your project requires.
Our production sites
BioCarbon Technology Asia
ReGenEarth
SEAD
Sustainable Development Goals
Pyrolysis operations contribute to 8 of the 17 Sustainable Development Goals (SDGs).
Want to discuss a project?
Our experts can advise on feedstocks, sites and all aspects of a successful carbonization project.