[Default] On Sat, 8 Jun 2013 14:10:58 -0700,Bob Tingleff <[email protected]> wrote:
>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. Insulation is necessary to reduce heat loss, so we are not saying don not use insulation. What we are saying is if the insulation is added to the "cool" side of a metal surface in the stove then it can cause the metal work to get to a temperature at which it fails, normally by oxidation. On our high pressure pyrolysis unit we had blocks of ceramic insulation inside a steel containment but it was necessary to allow for cooling of the outer skin because stray hot gas could get past the insulation joints to heat the steel. Steel seems to survive the temperature in a TLUD quite well, but this is only a temperature of around 600C. If the TLUD pyrolysis front reaches the primary air inlet and the char starts burning in updraught mode the temperature rapidly reaches over 1100C and steel fails quickly. AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
