Stephen, Is it OK to quench biochar with water? Can biochar be put in an airtight container where it then cools off?
Paul On Mon, Apr 29, 2013 at 7:04 AM, Stephen Joseph <[email protected]>wrote: > 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/> >> >> > > _______________________________________________ > 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/ > > > -- Paul A. Olivier PhD 26/5 Phu Dong Thien Vuong Dalat Vietnam Louisiana telephone: 1-337-447-4124 (rings Vietnam) Mobile: 090-694-1573 (in Vietnam) Skype address: Xpolivier http://www.esrla.com/
_______________________________________________ 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/
