Hi Til,
Welcome to DOW.
1: The video posted is actually a raw wood gasifier, mistakenly described as charcoal gasifier.
2: yes, the best solutions for overheating nozzles, tempering the glowing charcoal are EGR and water drip, both enhancing the gas quality. Even stated by Kalle that 17% Co2 mix was possible.
3: The kalle gasifier system is sensitive on its fuel but however teaches us a lot about how to manage some problems that occur to other builders.
My opinion: a: creating perfect fuel is less cumbersome then trying to build your gasifier around less quality fuel. Hence i make high quality charcoal for starters.
b: i completely empty/refill my gasifier for every next run, works as a charm and this i consider as my secondary advice.
building a gasoutlet and a hopper shutoff valve between reactor chamber and hopper are on my list. saves me refill/cleanup time.
The heat accumulation occuring in my charcoal gasifiers does not comes thru the charcoal but from the heattransfer from the metals. The balance between descending charcoal and rising gas has been established in the construction sizing. The less waterdrip i use, the less i need to worry about wet gas heat rising.
using a insulation ring/flange between reactor body and hopper, will block heattransfer thru the metal.
If i put my gasifier in the driving wind the gasifier stays at ambient temperature even at 30 cm above the nozzle.
The gas power is significant greater with cooler gas.
For starters: nothing beats a simple fire system
For advanced: I havenāt seen something better or more versatile then a WK gasifier yet.
Overall: I learn here on DOW every dayā¦ and enjoy every minute reading here
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