A three-stage gasifier separates the pyrolysis, combustion and gasification (reduction) steps. If all goes well, the result is low-tar gas (20-200 mg / Nm3).
This laboratory gasifier has 4 modes of operation. 3 good, and 1 bad (which gives tarry gas, unavoidable during warmup).
The air must be preheated. Optimally min 400C or rather 500C. (using the exhaust heat and/or the producer gas heat in production).
At this occasion (not always!), the middle-burner burns even with 15C air input.
