[Terrapreta] Tender offered for a design for a simple biochar cooker - or pre-made unit

[Frank Teuton]

I agree with this, if some of the engineering people or firms can offer 
plans or models of simple, clean burning char making pyrolysis heating 
units, for example, one that can provide supplemental replacement heat for a 
30x96 greenhouse that would divert a certain percentage of the oil normally 
used, this would allow those of us in market gardening with greenhouses to 
use local materials to generate our own char and capture the energy 
benefits.

Market gardeners are also uniquely well placed to experiment with char in 
various ways. I was rereading Eliot Coleman's masterpiece, the New Organic 
Grower, 2nd edition, and found a use for char as a soil darkening agent to 
increase solar gain for early springtime planting. Char can be added to 
greenhouse soils, to compost, to compost teas, etc, and those growing for 
market if they have self generated char should be ideally placed to evaluate 
its strengths and weaknesses.

So, how about it, engineering peoples?

Frank Teuton