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 <[email protected]> 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 <[email protected]> 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, <[email protected]> wrote:
> 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. 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" <[email protected]>
> To: "'Discussion of biomass cooking stoves'"
> <[email protected]>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <[email protected]>
> 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
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20111012/ae795c21/attachment-0001.html>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 12 Oct 2011 11:19:02 -0400
> From: "Crispin Pemberton-Pigott" <[email protected]>
> To: <[email protected]>, "'Discussion of biomass cooking stoves'"
> <[email protected]>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <[email protected]>
> 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 <[email protected]>
> To: Discussion of biomass cooking stoves
> <[email protected]>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <[email protected]>
> 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
> > [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/
> >
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20111012/702a38b7/attachment-0001.html>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 12 Oct 2011 09:27:59 -0700
> From: "Frank Shields" <[email protected]>
> To: "'Discussion of biomass cooking stoves'"
> <[email protected]>, <[email protected]>
> Subject: Re: [Stoves] burning rice husk
> Message-ID: <[email protected]>
> 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
> [email protected]
> www.compostlab.com
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Crispin
> Pemberton-Pigott
> Sent: Wednesday, October 12, 2011 8:19 AM
> To: [email protected]; '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
>
> 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/
>
>
> End of Stoves Digest, Vol 14, Issue 17
> **************************************
>
>
> _______________________________________________
> 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/
>
>
>
>
>
> --
> 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/
> _______________________________________________
> 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/
