[Stoves] Stoves Digest, Vol 22, Issue 10
Marc Pare
mpare at gatech.edu
Wed Jun 13 04:31:27 CDT 2012
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
<rstanley at legacyfound.org>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 <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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