Tom, I guess it may depend on what you consider a clean burn. My experiments focused the gases through a smaller out let pipe and then added the secondary air. So for a two foot diameter drum the pipe was three inches in diameter. Air was introduced near the top having only half that distance to penetrate, and combustion occurred in a six inch diameter chimney , six feet tall above.
Combustion was measurably good to very good nineteen times out of twenty. So, what indeed is the limit? Alex On 2012-09-29 11:47 AM, "Tom Miles" <[email protected]> wrote: > AD, Paul, Kobus and others. Many thanks for the suggestions. **** > > ** ** > > What is the largest practical size (kg fuel/hr, kW) for a single TLUD with > a clean stack for heat recovery? There must be a limit to the air > penetration to get a clean gas burn form a natural draft stack or even a > fan driven TLUD. **** > > ** ** > > Tom **** > > ** ** > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Anand Karve > *Sent:* Friday, September 28, 2012 11:22 PM > *To:* Discussion of biomass cooking stoves > *Subject:* Re: [Stoves] Fabricated Burn Barrel TLUDS**** > > ** ** > > Dear Tom,**** > > we regularly supply charring kilns made out of used 55 gallon drums. The > kilns are based on the TLUD principle. The cost of a kiln plus an extra > barrel for storing the char, is about US$100. We have sold more than 100 > such kilns in India and have also trained a number of persons from India > and Africa. These kilns are so easy to manufacture, that we ask the > trainees to photograph and take measurements of our kiln so that they can > copy the design. In many instances, people buy a kiln from us, because they > feel that their local fabricator would be better able to copy the design > from an actual object than from a blue print or a photograph.**** > > The advantage of using 55 gallon drums is that used drums are available at > a relatively low cost, and the kilns are portable. Instead of transporting > the biomass, one transports the kiln to the location where the biomass is > available, and brings back only the charred material, which weighs only a > third as much as the biomass. **** > > Yours**** > > A.D.Karve**** > > On Fri, Sep 28, 2012 at 11:42 PM, Tom Miles <[email protected]> wrote:*** > * > > Am often asked if there is a burn barrel sized TLUD that is commercially > fabricated. We’ve seen some great DIY with Doug’s Jolly Roger and others. > Is anyone fabricating a 55 gal drum sized TLUD that can be used for regular > biochar production? If so, what is the cost and availability?**** > > **** > > Thanks**** > > **** > > Tom Miles **** > > > _______________________________________________ > 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://www.bioenergylists.org/ > > **** > > > > > -- > *** > Dr. A.D. Karve > Trustee & Founder President, Appropriate Rural Technology Institute (ARTI) > > **** > > _______________________________________________ > 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://www.bioenergylists.org/ > > >
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