All Japanese quench biochar with ash. This also helps to functionalise the surface of the biochar and make it more active
I actually use a mixture of soil and ash as the heat can help release locked up phosphorous. Regards Stephen Joseph On Mon, Apr 29, 2013 at 2:01 AM, Paul Anderson <[email protected]> wrote: > Dear all, > > These two and many other "tips" need to be collected and told to TLUD > stove users. One avenue is in Christa's Manual, Another is in stove > manuals and at training sessions. And at websites, etc. > > 1. Charcoal to extinguish hot charcoal: When dealing with small amounts > of hot charcoal as in the residential TLUD stoves, one easy way to > extinguish hot charcoal is to dump it into a somewhat larger amount of > already extinguished (cold) char. The cold char takes up much of the > heat, extinguishing the hot char. Be sure that it is well mixed and > sufficiently cooled to avoid re-ignition. This is best done in containers > that can be sealed. Containers of metal or ceramic are best, but even > wood could be used if the quantity of cold char is sufficient to prevent > the hot char from reaching the sides. As always, be careful because > oxygen to a small hot ember can lead to much greater combustion. > > 2. "Space fillers" in loose fuels in TLUD devices: > > General note about fuel in TLUDs: > In general, dry biomass fuels in TLUDs need to appropriately fill most of > the air-space in the fuel chamber. This is accomplished with smallish > pieces such as wood chips, pellets, short-cut twigs, and shells of seeds. > Also, careful packing with vertical wood-segments or straight-ish reeds can > occupy the space. But twisted sticks and long-ish pieces that bridge > inside the fuel chamber leave too much space unoccupied. In those cases, > the space can be appropriately occupied by adding small pieces, as named > above. Shake the TLUD to assure that the pieces have settled in well, and > add more as needed. These fillers will also pyrolyze and become charcoal. > > Inert materials as "space fillers": Technically, the space fillers could > be inert materials such as ball bearings or pebbles (of rock that will not > shatter with this heat) or fired clay balls. Although they could function > effectively, they would require separation after the batch is unloaded and > cooled. But there is one material that solves these inconveniences and > costs. It is charcoal. > > Charcoal as a space filler: TLUD stoves make charcoal. Therefore, > charcoal is not a fuel for TLUD stoves. However, small pieces of charcoal > (but not charcoal fines) can also be used as "space fillers" to solve the > need to restrict air flow in the fuel chamber. The char will not pyrolyze > and will not burn (char-gasify or oxidize) as the pyrolysis front moves > downward through that biomass fuel. > > a. Char is abundant for TLUD users, and at no additional cost, and is not > consumed. > > b. Unlike small pieces of biomass as fillers, char pieces cannot catch on > fire and then fall down to the lower areas of the fuel chamber and igniting > fire there. > > Charcoal as a reducer of thermal output: Clearly in the above statements > when charcoal is used as a space filler, the fuel chamber contains less > biomass and therefore less heat will be generated (which is desirable for > simmering and some other cooking needs). > > Another variation is to have well packed (mainly straight) wood or reeds > or stems as a vertical bundle in the middle of a TLUD fuel chamber. Then > load in small charcoal all around the bundle to fill in the remaining > space. When used (pyrolyzed), the fuel will yield heat in proportion to > its cross-sectional area of the fuel bundle, not of the entire > cross-sectional area of the fuel cylinder. This is because the annulus of > char is essentially non-combustible at the pyrolytic temperatures in the > TLUD reactor. > > Variations of all of the above need to be tested and even measured. > (This will be utilized at the Stove Camp at Aprovecho 22 - 26 July 2013). > > Note: Credit for much of the above goes to Dr. Jack Bacon, a senior > scientist at the NASA Johnson Space Center in Houston, TX. Jack, a leader > in the local chapter of Engineers Without Borders (EWB-JSC), suggested > charcoal as fillers during discussions in April 2013 with Paul Anderson > about an EWB project to use TLUDs for heat in a fruit dryer in Rwanda. > > Dr TLUD > > -- > Paul S. Anderson, PhD aka "Dr TLUD" > Email: [email protected] Skype: paultlud Phone: +1-309-452-7072 > Website: www.drtlud.com > > > ______________________________**_________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected].**org <[email protected]> > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.**org/mailman/listinfo/stoves_** > lists.bioenergylists.org<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/ <http://stoves.bioenergylists.org/> > >
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