In order to get a charcoal production method that
-- this simple backyard/allotment/home garden sized system can be used.
The unit consists of two steel barrels. Only.
The smaller with no alterations a all. It is filled with dry biomass and put upside down in the larger one.
In the larger one, holes are cut on the side, some centimetres (an inch) above the bottom, large enough to let in an ample amount of air.
The larger barrel shold reach at least ten centimeters (4 inch) above the smaller vessel, to get a good "chimney"-effect, i.e. a strong draught from the air inlets, and a hot fire throughout the process.
This system is aimed to be a 'backyard charring method' . It is cheap and easy to construct and handle, and meant to replace the backyard burning of twigs, taking place everywhere, with a method of increasing soil fertility at the same time as reducing CO2 in the air.
It is not meant as a large scale method, since the surplus gases, that could be of industrial use, are burnt and the useful heat is dissipated. (Although you could easily cook food on the fire if you put a grid on the top)
But it should be seen as an introduction to charring, and as an eye-opener for the usefulness of charcoal in the soil.
That the threat of climate change, in an infinitesimal way, simultaneously is reduced should be seen as a bonus.
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