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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Friends<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Interesting set of features on this stove:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://www.freepatentsonline.com/4309965.pdf"><span style='color:windowtext;text-decoration:none'>http://www.freepatentsonline.com/4309965.pdf</span></a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It looks like it is a wood-pyrolysing sidedraft gas-burning concrete-lined combustor attached to a water heater.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It makes frequent mention of refractory materials cast in situ and the complete burning of the gases.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Another one might be of interest to the jatropha cake burners:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://www.freepatentsonline.com/1469600.pdf"><span style='color:windowtext;text-decoration:none'>http://www.freepatentsonline.com/1469600.pdf</span></a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards<o:p></o:p></p><p class=MsoNormal>Crispin<o:p></o:p></p></div></body></html>