Belonio's TLUD design calls for an insulated gasifier reactor, with the inner cylinder being 20 gauge stainless, though Paul O's version is not insulated. And Rocket stoves are insulated. So I'm surprised to see the comments below pass without any discussion. I wonder if Belonio's rice husk gasifier stoves have longevity problems.
Bob Tingleff On Fri, 31 May 2013 18:39:54 -0400,"Crispin Pemberton-Pigott" <crispinpigott at gmail.com <http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org>> wrote: >*If you use metal, do not put insulation behind it. You must either waste a >bit of heat or use it for preheating air. * This is very important, I think I once saw it posted that the temperature of the metal for purposes of longevity was as if it was the average temperature of the two surfaces. As stainless is a worse conductor than mild steel it follows that one should use the thinnest sheet needed to prevent the inner surface getting too hot. We had a customer who would not understand this, he was firing an oil burner into a fire tube heat exchanger through a tube, this tube burned out every few months and he would replace it with a thicker tube, which burned out faster. What we recommended, and he ignored, was to make the tube thin and bleed some excess air over it into the heat exchanger. In the past we talked about a "wash" of clay suspended in milk to occasionally paint the steel surface exposed to combustion, I tried it but as I don't run stoves for long enough never came to a conclusion. I have a cast iron Jotul stove here which is 30 years old and hasn't burned through, though there have been problems at the plate joints. AJH
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