Biochar producing wood stove

I was recently in Guatemala at a permaculture farm called Granja Tz'ikin where they created biochar from the stove that heated their temazcal (traditional sauna).
They used the biochar in a couple different ways including adding a small percentage to their goat feed for additional nutrients.

Your idea seems to be reasonable and supportive of a self reliant lifestyle, so I would say go for it and scientifically study your process to use as a foundation for a petition to the government for its continued use of the laws change.

So I tried burning a batch of pellets in a Top Lit Top Draft vessel.
No matter what I did, I could not get it to burn down to the bottom.
The can I used had a closed bottom and air inlets halfway up.
I actually drilled the holes while it was smoldering, in an attempt to get it to burn cleanly again.
They helped, but not for long.
I added chimneys, they also helped  some.
I think loose wood might do better, the examples I found that seemed to burn all the way down used loose stacked wood.
There is probably a ratio of surface area to depth which determines how deep down the fuel will be able to burn cleanly before it chokes itself out.

I don't think I will pursue this Top Lit Top Draft thing any further.
I only came to the idea trying to explain the long clean-ish burn of a sawdust stove.
I will try be trying a sawdust stove and pellets burned in a sawdust stove.

But first I will try to repurpose the tin can I used tonight into a self quenching TLUD.

I'm under the weather,  but still sky bluing...

I was reading a thread about oven placement relative to the core and riser of a batch box stove.
It is possible to make the floor of the oven and the ceiling of the burn chamber one and  the same.

If that oven had the proper vents or piping,  could it be filled with wood, the wood pyrolysised to charcoal and the wood gass consumed  in the burn chamber?
Could you build ovens on either side of the batch box burn chamber to do the same?

William Bronson wrote:It is possible to make the floor of the oven and the ceiling of the burn chamber one and  the same.

In Peter's DSR description, he makes the suggestion that the top box can be used as a black oven.
batchrocket.eu

Here is an indoor space heating TLUD developed by Bill Knass.
It seems very well thought out.