There are holes in the bottom of a barrel. It is getting a draft to get started from the chimney effect. It starts right up with a piece of newspaper, and maybe a cup of used motor oil drizzled lightly over the top. If there is uneveness it is usually because the material isn’t consistent, which I know is a problem, but that is a lot more work.
I think it actually works a lot like the Sheet Kiln.
It takes about 1.5 hours to burn down. The yield isn’t that great, but I could easily be letting it run too long, and there are a lot of small twigs in these batches so it is harder to tell.
I am dumping a 5 gallon bucket of water on it to put it out, stirring it slightly to get under areas that didn’t get drenched and then putting the cover on it and letting it sit for about 15 minutes. I think the excessive steam helps put it out as well.
The advantage is I can dump it out and reload immediately. Right at this moment it is about speed. I need to free up some space.
I can probably dry out the charcoal by just dumping it into a 55 gallon drum with a pipe out the top and slits on the bottom. It gets wood nice and dry.
I will get a picture here shortly.