Hi Thierry. Sorry for taking this long to respond. I have been working on a project, but it’s been stalled for quite a while. Essentially it’s a downdraft gasifier, meant to (hopefully) burn coarser chunk wood, reducing it to charcoal which will drop for storage. The fan is an ejector system to draw wood gas from slots in the bottom of the larger pipe, to be burnt in a refractory lined swirl burn chamber, then passed through a heat exchanger. The grate has a fixed, and a moveable part, to shake charcoal through, it would be stroked on a periodic cycle.
I think the concept is sound, but my design and execution may not be effective, as there has been no calculated design. At least it’s something to work with and learn from.
The tube is a Chinese steel coil liner, 20 1/2" diameter, 11ga, which allows using a steel barrel as either an insulation jacket or for air preheat.
