Hi, all. As I mentioned in another thread
, I'm interested in partially fueling a rocket stove
with the pyrolysis gases from converting sweet sorghum crop residue into biochar
(and use the heat to cook the sorghum juice into sorghum syrup). My current plan is to have two shelves in the combustion chamber: a lower shelf for a wood
fire, and an upper shelf for 1 or 2 lidded stainless hotel pans (steam table trays, 4-5 gal) to hold the shredded biochar feedstock. When I see that they have stopped emitting pyrolysis gases, I can swap in new trays of fresh feedstock.
While it's easy to build the sides of the combustion chamber out of refractory brick, the top becomes more challenging because the hotel pans are about 12" x 20", and I don't know what to use to span that width. Cinder blocks are 16" long, but I don't know if they can withstand the heat. I suspect metal would be even worse, although I was thinking maybe I could design a metal top to serve as an air channel to feed
oxygen into the heat riser/chimney (would that air flow keep the metal cool enough
?). Any suggestions?