Hi Crispin, Thanks for the photo.
It looks like they have made a base and a lid, each out of 1/3rd of a 200 litre drum, which have been perforated for primary and secondary air. These are added to a standard 200 l drum, presumably one without a lid, which has either a perforated base or no base at all. The fluepipe looks at least 250mm diameter, perhaps more. This is similar in construction to the re:char unit - but with air supply provided in the special base and lid. With these and similar drum based biochar kilns becoming more common, I wonder whether it is worthwhile categorising them into their basic mode of operation, so when new designs come available, they can be similarly categorised and their main design points, such as biomass to char conversion efficiency defined. For example, top lit, updraft, 25% conversion Thanks for sharing - if there are any reports or links to these developments, I would be interested. Ken
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