[Stoves] Stoves Digest, Vol 14, Issue 17

Ron Larson rongretlarson at comcast.net
Sat Oct 15 00:56:03 CDT 2011 

Trevor, Paul, and lists

    See Table 1 on p 12 of the draft IBI guidelines, which states that the ash content shall be less than 50%.  If you think this is the wrong level, now is the time to speak up.

   See http://www.biochar-international.org/sites/default/files/IBI_Guidelines_for_Specifications_of_Biochars_for_October_2011_Public_Review.pdf

Ron


Sent from my iPad

On Oct 14, 2011, at 5:13 PM, Paul Olivier <paul.olivier at esrla.com> wrote:

> Trevor,
> 
> You are right about the fixed carbon content of rice hulls at about 15%.
> If the ash content is 20%, then this leaves a volatile matter content of 64%.
> This calculation is on a dry weight basis.
> 
> If we gasified all volatile matter, 
> the fixed carbon content of the char would rise to about 43%,
> and the ash content would rise to about 57%.
> But typically rice hull biochar has an ash content of about 40%.
> This means that there is still a lot of volatile matter that remains in the biochar.
> 
> In the case of rice hulls,
> the amount of volatile matter that remains in the biochar is determined by the rate of gasification.
> At times the yield in rice hull biochar by weight is as low as 30%.
> At times the yield is as high as 50%.
> If the rate of gasification is high, high temperatures within the reactor are reached.
> With high temperatures, more volatile matter is gasified.
> 
> We need operating temperatures well beyond 1000 C before fixed carbon gets gasified.
> In my opinion it makes little sense to gasify fixed carbon.
> 
> Thanks.
> Paul
> 
> On Thu, Oct 13, 2011 at 3:53 PM, Trevor Richards <febiochar at gmail.com> wrote:
> Tests I've seen on rice husk char showed 15% fixed carbon. 
> I do not recall seeing a biochar definition, specifying a minimum fixed C.
> How low could the C% be & still be defined a biochar?
> 
> On 13 October 2011 03:00, <stoves-request at lists.bioenergylists.org> wrote:
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> Today's Topics:
> 
>   1. Re: burning rice husk (Crispin Pemberton-Pigott)
>   2. Re: burning rice husk (Crispin Pemberton-Pigott)
>   3. Re: burning rice husk (CHRISTA ROTH)
>   4. Re: burning rice husk (Frank Shields)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 12 Oct 2011 11:19:02 -0400
> From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
> To: "'Discussion of biomass cooking stoves'"
>        <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <037501cc88f2$500af3e0$f020dba0$@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Dear Christa
> 
> 
> 
> There are other initiatives to make stoves based on the approach Alexis has
> taken. Paul has other models that show some promise as well.
> 
> 
> 
> The Mayon Turbo Stove is not perfected yet and I don't think much is being
> invested in trying. It holds promise from the point that it does not require
> a fan. I worked on one here (in Waterloo) earlier this year together with
> two interns from REAP.  We doubled the overall efficiency but created new
> problems that it got too hot. It needs additional work to keep the fuel
> cool. There are of course other ways to burn the fuel with natural draft.
> Maybe with the advent of cheap power from TEGs we will all make fan stoves
> and not worry about natural draft any more.
> 
> 
> 
> The MTS has the important advantage that is can be refuelled continuously at
> your convenience. It does not need to be loaded in batches.
> 
> 
> 
> Regards
> 
> Crispin
> 
> 
> 
> 
> 
> 
> 
> +++++++
> 
> 
> 
> The best rice-husk burning stoves I know of are the ones based on the
> tremendous work of Alexis Belonio. Paul Olivier' s work in Vietnam has taken
> rice-husk burning stoves in the household-size range to another level,
> uncomparable with natural-draft stoves like the Mayon Turbo, LoTrau or
> whichever. Paul has generously shared a lot of his work on this list in the
> last days, so you can look more details up from the links provided there or
> consult the section on rice-husk burning gasifiers, pages 43-48 of  the
> manual microgasification
> http://www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf,
> 
> it contains all I found as per last year. If anybody knows of models that
> are not included there, please let me know, so that they can be included in
> the next update.
> 
> regards
> 
> christa
> 
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> ------------------------------
> 
> Message: 2
> Date: Wed, 12 Oct 2011 11:19:02 -0400
> From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
> To: <rajan_jiby at dataone.in>, "'Discussion of biomass cooking stoves'"
>        <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <037f01cc88f2$53782e30$fa688a90$@gmail.com>
> Content-Type: text/plain;       charset="us-ascii"
> 
> Dear Rajan
> 
> One stove that burns whole rice hull efficiently is the Mayon Turbo Stove.
> 
> Regards
> Crispin
> 
> 
> +++++++
> 
> I do not know whether a stove can efficiently burn rice husk.
> 
> But it seems rice husk can be burnt efficiently in FBC ( fluidised bed
> combustion ) boilers. There are several medium sized FBC boilers operated
> all over India. So the fuel need not go waste.
> 
> Regards,
> 
> 
> Rajan
> 
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Wed, 12 Oct 2011 17:39:49 +0000
> From: CHRISTA ROTH <stoves at foodandfuel.info>
> To: Discussion of biomass cooking stoves
>        <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <B4B60F1C-E72F-44B4-8B49-6B22E3F30982 at foodandfuel.info>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed";
>        DelSp="yes"
> 
> Crispin, see below:
> Am 12.10.2011 um 15:19 schrieb Crispin Pemberton-Pigott:
> 
> > There are other initiatives to make stoves based on the approach
> > Alexis has taken. Paul has other models that show some promise as
> > well.
> CR: Which Paul do you mean? I was talking of Paul Olivier below, who
> has taken Belonios concept to a new era.
> 
> >
> > The Mayon Turbo Stove is not perfected yet and I don?t think much is
> > being invested in trying. It holds promise from the point that it
> > does not require a fan. I worked on one here (in Waterloo) earlier
> > this year together with two interns from REAP.  We doubled the
> > overall efficiency but created new problems that it got too hot. It
> > needs additional work to keep the fuel cool. There are of course
> > other ways to burn the fuel with natural draft. Maybe with the
> > advent of cheap power from TEGs we will all make fan stoves and not
> > worry about natural draft any more.
> >
> > The MTS has the important advantage that is can be refuelled
> > continuously at your convenience. It does not need to be loaded in
> > batches.
> CR: But the disadvantage I noted is that it needs a lot of attention:
> we had to tap the stove every two minutes last year in Belchertown
> with the colleagues from REAP to assist gravity and make the rice
> husks fall down, otherwise there was no continuous feed adn the fire
> would go out. Maybe that 'spoonfeeding' can be reduced with skills and
> acquired habits, but as an unskilled user I found it rather
> inconvenient.
> >
> > Regards
> > Crispin
> >
> >
> >
> > +++++++
> >
> > The best rice-husk burning stoves I know of are the ones based on
> > the tremendous work of Alexis Belonio. Paul Olivier' s work in
> > Vietnam has taken rice-husk burning stoves in the household-size
> > range to another level, uncomparable with natural-draft stoves like
> > the Mayon Turbo, LoTrau or whichever. Paul has generously shared a
> > lot of his work on this list in the last days, so you can look more
> > details up from the links provided there or consult the section on
> > rice-husk burning gasifiers, pages 43-48 of  the manual
> > microgasification http://www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf
> > ,
> > it contains all I found as per last year. If anybody knows of models
> > that are not included there, please let me know, so that they can be
> > included in the next update.
> > regards
> > christa
> > _______________________________________________
> > Stoves mailing list
> >
> > to Send a Message to the list, use the email address
> > stoves at lists.bioenergylists.org
> >
> > 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/
> >
> 
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> ------------------------------
> 
> Message: 4
> Date: Wed, 12 Oct 2011 09:27:59 -0700
> From: "Frank Shields" <frank at compostlab.com>
> To: "'Discussion of biomass cooking stoves'"
>        <stoves at lists.bioenergylists.org>,      <rajan_jiby at dataone.in>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <EF2941FD30314943BF1939C78F58E7CE at cl.local>
> Content-Type: text/plain;       charset="us-ascii"
> 
> Stovers,
> 
> I was talking to a rice grower in Northern Calif. and found out that Wild
> Rice has much less silica in the hulls than White Rice. I haven't tested
> wild rice hulls to confirm.
> 
> Frank
> 
> Frank Shields
> Control Laboratories, Inc.
> 42 Hangar Way
> Watsonville, CA  95076
> (831) 724-5422 tel
> (831) 724-3188 fax
> frank at compostlab.com
> www.compostlab.com
> 
> 
> -----Original Message-----
> From: stoves-bounces at lists.bioenergylists.org
> [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin
> Pemberton-Pigott
> Sent: Wednesday, October 12, 2011 8:19 AM
> To: rajan_jiby at dataone.in; 'Discussion of biomass cooking stoves'
> Subject: Re: [Stoves] burning rice husk
> 
> Dear Rajan
> 
> One stove that burns whole rice hull efficiently is the Mayon Turbo Stove.
> 
> Regards
> Crispin
> 
> 
> +++++++
> 
> I do not know whether a stove can efficiently burn rice husk.
> 
> But it seems rice husk can be burnt efficiently in FBC ( fluidised bed
> combustion ) boilers. There are several medium sized FBC boilers operated
> all over India. So the fuel need not go waste.
> 
> Regards,
> 
> 
> Rajan
> 
> 
> _______________________________________________
> Stoves mailing list
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> to Send a Message to the list, use the email address
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> .org
> 
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
> 
> 
> 
> 
> 
> ------------------------------
> 
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> http://www.bioenergylists.org/
> 
> 
> End of Stoves Digest, Vol 14, Issue 17
> **************************************
> 
> 
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> 
> 
> 
> 
> -- 
> Paul A. Olivier PhD
> 27C Pham Hong Thai Street
> Dalat
> Vietnam
> 
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> Mobile: 090-694-1573 (in Vietnam)
> Skype address: Xpolivier
> http://www.esrla.com/
> _______________________________________________
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> http://www.bioenergylists.org/
> 

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