Alex, I generally concur. I do note that natural draft TLUDs are famously non-linear in their operation. Thus they can only be very well "tuned" to a limited portion of their performance curve. The rest has to be "good enough".
With fans, sensors, and motors, the performance can be made to be nearly linear, except at the start and the finish. The Whitfield reactor does this very well. Cheers, Jock Extract CO2 from the atmosphere! On Jul 30, 2013, at 5:43 PM, Alex English <[email protected]> wrote: > As another example, I have seen the varnished pot bottom after use with a fan > assisted TLUD on low fire. At high fire there was none and that is with dry > pellets. Both had no visible emission. I felt it was excess air and/or > sneekage around the small flame that caused it. Turbulence was high with > pre-heated secondary air. Perhaps the firing range of a TLUD can be expanded > and remain minimal in "varnish", soot and CO, however I am of the opinion > that there is only one tuned sweet spot for any burner and all other burn > rates and air adjustments are a compromise unless there is also a change in > the structure of the burner. We need numbers on the scale of the compromise. > > Is varnish a good conductor? > > Alex > > > On 30/07/2013 8:02 AM, Jonathan P Gill wrote: >> Christa, >> >> I have done that too. If the TLUD is very poorly tuned, you can get nasty >> deposits from "dry" wood pellets. I have made some very nice creosote from >> wood pellets with TLUDS that were operating at too low a temp and had a very >> poor fuel air ratio with insufficient turbulence in the burning gases. >> >> I find that, with proper tuning, I can achieve clean results from about any >> fuel, including freshly cut wood chips @ 40% moisture content. I can say >> this from experience. >> >> Currently, I am working in TLUD powered retorts heated from the bottom with >> gas jets coming out from the top. These are the opposites of TLUDS as they >> are Bottom Up designs. So far so good. More to come... >> >> Regards, >> >> Jock >> >> Extract CO2 from the atmosphere! >> >> On Jul 30, 2013, at 1:57 AM, CHRISTA ROTH <[email protected]> wrote: >> >>> The TLUD only if you have a well processed dry predictable fuel. otherwise >>> you can coat the entire fins in a 'varnish' from condensed vapors and that >>> is no tun at all to scrub off, not even from a flat bottom pot (done that…) >>> Christa (from the bush in Benin, with patchy internet access) >>> >>> Am 29.07.2013 um 23:31 schrieb "Andreatta, Dale A." >>> <[email protected]>: >>> >>>> Yes, a TLUD would have a lot less soot. Charcoal stoves too. >>>> >>>> The message from Todd Albi mentioned a Turbopot, whose website I just >>>> checked out. It also claims fantastic results. Who knew there were all >>>> these finned pots out there? >>>> >>>> Dale >>>> >>>> From: Stoves [mailto:[email protected]] On Behalf Of >>>> Tom Miles >>>> Sent: Sunday, July 28, 2013 2:27 PM >>>> To: 'Discussion of biomass cooking stoves' >>>> Subject: Re: [Stoves] Cajun Rocket Pot >>>> >>>> Is a TLUD likely to have less soot buildup on fins? >>>> >>>> Tom >>> _______________________________________________ >>> 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/ >> >> >> _______________________________________________ >> 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/ >> > > _______________________________________________ > 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/ >
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