[Stoves] Stoves Digest, Vol 22, Issue 10
CHRISTA ROTH
stoves at foodandfuel.info
Wed Jun 13 08:11:24 CDT 2012
Richard, colloquially we call anything that is left behind in a stove
'ash'. That is not quite correct: as AD rightly says, ashes are the
mineral components that a plant took up from the soil when growing.
They have no calorific value and cannot be burnt. SO even the most
complete combustion leaves ash behind. The actual ash content, as Marc
has pointed out in the meantime, depends on the plant material. Any
plant-parts that have to provide physical strength use silica as their
reinforcing skeleton. thus the high silica / ash content of rice husk
or bamboo e.g.
the leftover bits of char are technically not part of the ash, but
already pyrolised (charred) biomass waiting to be 'burnt' into ash.
for that step to convert char to ash a lot of air is needed to be in
contact with the hot enough embers so that the oxidisation can take
place.
if a lot of char is left behind, it is an indication that either there
is not enough air (oxygen) or temperature for the conversion from
char to ash. this can be due to the processing of the fuel or the
stove or most probably a mixture of both.
I have tried to visualise the conversion process of solid biomass to
ash on pages 8-12 in the GIZ-HERA manual microgasification http://www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf
regards
christa
Am 13.06.2012 um 03:34 schrieb Richard Stanley:
> 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 <rstanley at legacyfound.org
> > 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: "stoves-request at lists.bioenergylists.org" <stoves-request at lists.bioenergylists.org
> >
> To: stoves at lists.bioenergylists.org
> Sent: Thursday, June 7, 2012 10:00 PM
> Subject: Stoves Digest, Vol 22, Issue 10
>
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> 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 <rstanley at legacyfound.org>
> To: Stoves and biofuels network <Stoves at lists.bioenergylists.org>
> 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: <9AB0C3F9-0CCE-438D-A1E0-82427677AF21 at legacyfound.org>
> 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: psanders at ilstu.edu 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:psanders at ilstu.edu">psanders at ilstu.edu</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:E9CEC228-B197-47EA-8D0E-BC0CF731FF8F at legacyfound.org" =
> type=3D"cite"><base href=3D"x-msg://133/">George,
> <div> ... snip ...</div>
> </blockquote>
> <blockquote =
> cite=3D"mid:E9CEC228-B197-47EA-8D0E-BC0CF731FF8F at legacyfound.org" =
> 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:E9CEC228-B197-47EA-8D0E-BC0CF731FF8F at legacyfound.org" =
> 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--
>
>
>
>
> ------------------------------
>
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> End of Stoves Digest, Vol 22, Issue 10
> **************************************
>
>
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> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute
> (ARTI)
>
>
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