Dear Ron and Nataniel
I was reviewing some combustors and there is a stove that works very similarly to the centre-fed stove Nathaniel is making. I limit that similarity to the way the pyrolysis is largely taking place on the periphery of the fuel chamber with the fuel being added on top. In the stove (US Pat 604,991 May 1898) the primary air is supplied through the top of the fuel but deliberately pulled to the side walls to keep the combustion (pyrolysis really) at the edge. Nathaniel’s is different in that the primary air is cut off shortly after ignition as soon as the flame is large enough to cover the exiting gas path. The interesting thing about the earlier unit is that it seems it is possible to maintain a continuous feed into a cylindrical fire. Fundamentally it is maintaining a typical downdraft coke surface that ignites the gases coming through the fuel but it does it by maintaining that coke bed on the vertical cylindrical walls. Perhaps it is a side draft stove after all. It is remarkable how many and varied coal burning stoves there were more than a century ago. Regards Crispin
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