I have had good results making biochar in a 55 gallon drum, with no holes in it, leaning over at a 45 degree angle. When fuel on the bottom of the barrel has burned enough throw more fuel on top to starve the bottom of oxygen. I have only done this with wood, but it should work with other materials. Just keep an eye on it and add material at an appropriate rate.

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I like that. I use the same 55gal drum but turn on its side and cut a saddle out of the middle. I have a note on it somewhere on here.