Perfect Air Control for Smoldering Combustion
- 1 min reading time
Producing high-quality biochar relies on maintaining precise control over airflow during combustion. Unlike open burning, biochar is created through smoldering combustion, a low-temperature process that occurs in an oxygen-limited environment. For this transformation to occur efficiently, the biomass must be heated in a sealed or semi-sealed chamber where oxygen is restricted—but not completely eliminated.
Through extensive testing, we've found that the optimal oxygen concentration for smoldering ranges between 16% and 21%. Too much air, and the process turns into open combustion, resulting in ash rather than biochar. Too little, and the fire dies out before the biomass can carbonize properly.
We’ve conducted numerous design trials to perfect the airflow balance in our kilns. The inner chamber is engineered with precisely positioned vents that allow just enough oxygen to enter, ensuring a stable and efficient smoldering process while preventing over-oxygenation.
Achieving the right balance of airflow is key—not just for producing better biochar, but also for improving energy efficiency and reducing emissions. It’s a fine line, but when done right, it makes all the difference.
