Many possible answers to the rather broad topic of why certain things are leftover from combustion. In this case,
- Higher amounts of air -> more fuel "burned up". If you don't have enough air for stoichiometric combustion, then you'll be left with plenty of carbon and volatiles in your fuel. - "Ash" is, as AD points out, what cannot be burnt at all in the fuel. It's a small fraction of typical fuels (wood <3%), with some exceptions (like rice husk >15%) - Just because you can't see the particulates doesn't mean they aren't there. PM10 is 10 microns in size, a human hair is 100. Furthermore, it's the small particles that are the worst for your health. Marc Paré B.S. Mechanical Engineering Georgia Institute of Technology | Université de Technologie de Compiègne my cv, etc. | http://notwandering.com On Wed, Jun 13, 2012 at 10:34 AM, Richard Stanley <[email protected]>wrote: > Ok AD, > > Thanks for that but if what you say is true, I guess I remain with the > question then how is it, that more efficient stoves "burn up" the > briquettes so completely that little if any ash is left. The same > briquettes with same blend, processed the same way leave chunky black > carbon bits-- the so called biochar when combusted poorly . If the ash in > the former case is not being combusted how, then, is it being reduced . > > I have seen Rok's holey rocket and it is not being pushed out as > particulates, so…. > > Regards > > Richard > ========== > > On Jun 12, 2012, at 5:58 PM, Anand Karve wrote: > > Dear Richard, > a small correction. Ash is the non-combustible part of the fuel. > Yours > A.D.Karve > > On Wed, Jun 13, 2012 at 2:24 AM, Richard Stanley <[email protected] > > wrote: > >> Sebo Robert, >> I think that Rok is te real expert here, as he designed the stove and has >> tested it many times. I do know that essentialy, ash = unburnt fuel… >> Ultimately, no ash = perfect combustion. And of course it also depends >> uponwhat you are using… >> Richard Stanley >> >> On Jun 12, 2012, at 1:28 AM, ssemaganda Robert wrote: >> >> Thanks for the nice stoves on this web site >> http://holeyroket.wordpress.com/2011/06/ but I would want to know how is >> one able to remove the ash that keeps accumulating b'se one thing I know >> with briquettes is that they produce alot of ash. I think you will agree >> with me in that! >> let me hear from you stovers >> Robert >> >> ------------------------------ >> *From:* "[email protected]" < >> [email protected]> >> *To:* [email protected] >> *Sent:* Thursday, June 7, 2012 10:00 PM >> *Subject:* Stoves Digest, Vol 22, Issue 10 >> >> Send Stoves mailing list submissions to >> [email protected] >> >> To subscribe or unsubscribe via the World Wide Web, visit >> >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> or, via email, send a message with subject or body 'help' to >> [email protected] >> >> You can reach the person managing the list at >> [email protected] >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Stoves digest..." >> >> >> Today's Topics: >> >> 1. Fwd: on pre heating of biomass alongside the stove for near >> instant ignition and if desired, smokeless emission of desired >> aromatics (Richard Stanley) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Wed, 6 Jun 2012 12:17:56 -0700 >> From: Richard Stanley <[email protected]> >> To: Stoves and biofuels network <[email protected]> >> Subject: [Stoves] Fwd: on pre heating of biomass alongside the stove >> for near instant ignition and if desired, smokeless emission of >> desired aromatics >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset=us-ascii >> >> >> Seconded, Paul (thanks for that). >> ...from Here to Etorroficany it is: >> >> The briquettes at least seldom get so hot that you can't pick them up >> in your hands for a few seconds, or at least long enough to toss them = >> into the stove without burning yourself. Now when you figure out a way = >> to add in eucalyptus leaves to drive off mossis with smokeless aromatic = >> emissions out of wood (maybe you can do this with the raw wood source = >> but I have not seen it happen on our own stove here at home: It seems = >> the aromoatics are more easily emitted from the non wood faction of the = >> biomass). =20 >> >> For anybody interested, please take a look at Rok Oblak's site: He = >> pioneered the integration of molded-in fingers to his side fed briquette = >> rocket stoves. The design is being used in several countries now. These = >> and the story behind them is archived these on this site: = >> http://holeyroket.wordpress.com/2011/06/ >> >> Richard Stanley >> www.legacyfound.org >> >> >> >> On Jun 6, 2012, at 7:04 AM, Paul Anderson wrote: >> >> Stovers, >> >> I edited Richard Stanley's message below to focus on fuel drying. I = >> think the idea is great!!! >> >> And it can be expanded to be small wire baskets that can hang on the = >> sides or other means to keep the fuel close to the warm sides of the = >> stoves. =20 >> >> Many of the current configurations of TLUD stoves could adopt this = >> drying method very easily. =20 >> >> Alternatively for easily portable heat sources like many TLUDs, the fuel = >> for drying could be in a "cage" or rack of some type into which the TLUD = >> unit is placed, and then removed as in normal TLUD usage. >> >> SAFETY NOTE: Fires should not be unattended, and fires near fuels that = >> are being dried present even greater risks. But this is because of = >> wayward sparks. In the absence of sparks, however, merely drying the = >> fuels should not cause spontaneous combustion. Instead, the biomass = >> might start to reach some torrification (like the over-browning of a = >> piece of toast), which is not combustion. >> >> Stovers should consider ways to dry fuels using "waste" ambient heat = >> near the stoves. >> >> Paul >> Paul S. Anderson, PhD aka "Dr TLUD" >> Email: [email protected] Skype: paultlud Phone: +1-309-452-7072 >> Website: www.drtlud.com >> >> On 6/5/2012 2:21 PM, Richard Stanley wrote: >> > =20 >> > George, >> > ... snip ... >> > You could even add a small fingers to hold briquettes alongside to = >> super dry them for two benefits: near instant and near smokeless = >> ignition, and emission of desired aromas (eg., eucalyptus leaf blends = >> for flea /mozzie repellents, and lemon grass, cedar etc., etc., as used = >> tradtionally for medicinal / cerimonial purposes---without smoke). You = >> could, alternatively ... [use]... sheet metal riveted or fastened by = >> simple slots in stove wall with matching bent tangs in the plate.=20 >> > =20 >> > Heres a simple 3D sketch of the idea; am only guessing at stove shape = >> and configuration=20 >> >> [DrTLUD says: I was not able to attach Richard's diagram. Imagine a = >> peg sticking out from the side of a TLUD stove, with a holey briquette = >> on that peg. Or you can see it in his original message to the Stoves = >> List. and it should be in the Archives of the Stoves Listserv. ] >> > =20 >> > Richard Stanley >> > www.legacfound.org >> > =20 >> > =20 >> > =20 >> > =20 >> >> >> --Apple-Mail-6--76304495 >> Content-Transfer-Encoding: quoted-printable >> Content-Type: text/html; >> charset=us-ascii >> >> <html><head></head><body style=3D"word-wrap: break-word; = >> -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; = >> ">Seconded, Paul (thanks for that). <div>...from Here to = >> Etorroficany it is:</div><div><br></div><div> The briquettes at = >> least seldom get so hot that you can't pick them up in your hands for a = >> few seconds, or at least long enough to toss them into the stove without = >> burning yourself. Now when you figure out a way to add in = >> eucalyptus leaves to drive off mossis with smokeless aromatic emissions = >> out of wood (maybe you can do this with the raw wood source but I have = >> not seen it happen on our own stove here at home: It seems the = >> aromoatics are more easily emitted from the non wood faction of the = >> biomass). </div><div><br></div><div>For anybody interested, please = >> take a look at Rok Oblak's site: He pioneered the integration of = >> molded-in fingers to his side fed briquette rocket stoves. The design is = >> being used in several countries now. These and the story behind them is = >> archived these on this site: <a = >> href=3D"http://holeyroket.wordpress.com/2011/06/";> >> http://holeyroket.wordpr= >> ess.com/2011/06/</a></div><div><br></div><div>Richard = >> Stanley</div><div><a = >> href=3D"http://www.legacyfound.org";>www.legacyfound.org >> </a></div><div><br>= >> </div><div><br></div><div><br><div><div>On Jun 6, 2012, at 7:04 AM, Paul = >> Anderson wrote:</div><br class=3D"Apple-interchange-newline"> >> =20 >> <meta content=3D"text/html; charset=3DISO-8859-1" = >> http-equiv=3D"Content-Type"> >> =20 >> <div bgcolor=3D"#FFFFFF" text=3D"#000000"> >> Stovers,<br> >> <br> >> I edited Richard Stanley's message below to focus on fuel = >> drying. >> I think the idea is great!!!<br> >> <br> >> And it can be expanded to be small wire baskets that can hang on the >> sides or other means to keep the fuel close to the warm sides of the >> stoves. <br> >> <br> >> Many of the current configurations of TLUD stoves could adopt this >> drying method very easily. <br> >> <br> >> Alternatively for easily portable heat sources like many TLUDs, the >> fuel for drying could be in a "cage" or rack of some type into which >> the TLUD unit is placed, and then removed as in normal TLUD = >> usage.<br> >> <br> >> SAFETY NOTE: Fires should not be unattended, and fires near = >> fuels >> that are being dried present even greater risks. But = >> this is >> because of wayward sparks. In the absence of sparks, = >> however, >> merely drying the fuels should not cause spontaneous = >> combustion. >> Instead, the biomass might start to reach some torrification (like >> the over-browning of a piece of toast), which is not combustion.<br> >> <br> >> Stovers should consider ways to dry fuels using "waste" ambient heat >> near the stoves.<br> >> <br> >> Paul<br> >> <pre class=3D"moz-signature" cols=3D"72">Paul S. Anderson, PhD aka = >> "Dr TLUD" >> Email: <a class=3D"moz-txt-link-abbreviated" = >> href=3D"mailto:[email protected]";>[email protected]</a> Skype: = >> paultlud Phone: +1-309-452-7072 >> Website: <a class=3D"moz-txt-link-abbreviated" = >> href=3D"http://www.drtlud.com/";>www.drtlud.com</a></pre> >> <br> >> On 6/5/2012 2:21 PM, Richard Stanley wrote: >> <blockquote = >> cite=3D"mid:[email protected]" = >> type=3D"cite"><base href=3D"x-msg://133/">George, >> <div> ... snip ...</div> >> </blockquote> >> <blockquote = >> cite=3D"mid:[email protected]" = >> type=3D"cite"> >> <div> You could even add a small fingers to hold briquettes >> alongside to super dry them for two benefits: near instant = >> and >> near smokeless ignition, and emission of desired aromas = >> (eg., >> eucalyptus leaf blends for flea /mozzie repellents, and = >> lemon >> grass, cedar etc., etc., as used tradtionally for medicinal / >> cerimonial purposes---without smoke). You could, alternatively >> ... [use]... sheet metal riveted or fastened by simple = >> slots in >> stove wall with matching bent tangs in the plate. >> <div><br> >> </div> >> <div>Heres a simple 3D sketch of the idea; am only = >> guessing at >> stove shape and configuration <br> >> </div> >> </div> >> </blockquote> >> <br> >> [DrTLUD says: I was not able to attach Richard's = >> diagram. Imagine >> a peg sticking out from the side of a TLUD stove, with a holey >> briquette on that peg. Or you can see it in his original = >> message to >> the Stoves List. and it should be in the Archives of the Stoves >> Listserv. ]<br> >> <blockquote = >> cite=3D"mid:[email protected]" = >> type=3D"cite"> >> <div> >> <div> <br> >> </div> >> <div>Richard Stanley</div> >> <div><a moz-do-not-send=3D"true" = >> href=3D"http://www.legacfound.org/";>www.legacfound.org</a></div> >> <div><br> >> </div> >> <div><br> >> </div> >> <div><br> >> </div> >> <div> >> </div> >> </div> >> </blockquote> >> </div> >> >> </div><br></div></body></html>= >> >> --Apple-Mail-6--76304495-- >> >> >> >> >> ------------------------------ >> >> _______________________________________________ >> 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/ >> >> >> End of Stoves Digest, Vol 22, Issue 10 >> ************************************** >> >> >> _______________________________________________ >> 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/ >> >> >> >> _______________________________________________ >> 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/ > > > > _______________________________________________ > 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/ > > >
_______________________________________________ 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/
