mask stove – make charcoal smokelessly

Here is a stove with strong smokeless flame which also produces charcoal. No fan. Just fill with wood, add a bit of alcohol as fire starter, light a match and throw on top. General principle of TLUD (top lit up draft) stoves: Smouldering wood creates smoke and leaves behind charcoal. Smoke rises and is mixed with fresh air entering the stove above the smoke layer and burned off. Process details: Air from the small holes allows wood to smoulder continuously but is not enough to maintain a fire after the bit of alcohol is burned off. Rising smoke is mixed with the secondary air from the upper air hole and burned off in a self sustaining flame above the smoke layer. Flame is above and isolated from the charcoal by the smoke to avoid burning the charcoal so as to maximize charcoal production. The fire is smokeless because nearly all the smoke is burned off in the flame. When all water and hydrocarbons have been driven out of the wood the remaining CO production is insufficient to sustain the flame. At this point all of the remaining wood has turned to charcoal. Once the flame is out, remove the top of the stove and sprinkle water on the charcoal to put out the ember. Collect and dry the charcoal for use. I would love to see someone invent a 45 gallon drum stove to make charcoal which uses pyrolysis and does not burn the wood. The stove can be used for cooking or heating or boiling water and produce charcoal at the same time. For very dry wood feed, this stove produces about …
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