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I've been looking into just this a lot recently (should be working on my thesis but #YOLO).
Check out TLUD (top lit updraft) stoves. Most are larger and designed for third world fucks, but it can scale down probably. I'm probably going to throw together a micro naturally aspirated top lit updraft stove in the next week or so.
Anyway the whole point of these fuckers is they end up performing pyrolysis on your fuel (which can be all sorts of shit, from whatever wood or wood chips to literally shit) and burn the gas that's emitted. They're efficient as fuck, burn pretty damn hot, are stupid simple, and they make a nice, clean, nearly smoke/soot free flame.
Pic related is the basic idea.
Also the capillary hoop stove (search CHS-U on youtube for instructions) sounds like a pretty cool alcohol burner.
