Dear Friends
Interesting set of features on this stove: <http://www.freepatentsonline.com/4309965.pdf> http://www.freepatentsonline.com/4309965.pdf It looks like it is a wood-pyrolysing sidedraft gas-burning concrete-lined combustor attached to a water heater. It claims to be creating pyrolysis gases, feeding them sideways from the bottom of the hopper together with (fan-driven) secondary air creating a flaming zone separate from the combusting/pyrolysing biomass zone. It does this in a very restricted primary air environment and burns whole logs. It can be refuelled continuously because the fire is on the bottom of the chamber. It makes frequent mention of refractory materials cast in situ and the complete burning of the gases. Another one might be of interest to the jatropha cake burners: <http://www.freepatentsonline.com/1469600.pdf> http://www.freepatentsonline.com/1469600.pdf It claims to be able to burn duff coal (small, to dust). Maybe with a wire grate instead of the cast iron shown. Note that it has an updraft channel for getting the fire started. Many stoves this size have such a feature. It is often re-invented as a solution to the difficulties faced getting downdraft stoves started. Regards Crispin
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