[Stoves] Stoves Digest, Vol 19, Issue 39

Thu Jan 31 12:55:39 CST 2008

Dear All,

I would like to copy a message from HEDON (HE network) to you, because I do 
get frustrated, when I get all the long lists of discussion contributions 
every time again. For me it is much easier to follow the suggestion of 
HEDON:

"Hi Folks

Just a gentle reminder to delete previous text from emails circulating
in the CleanAirSIG list - so as not to make messages unnecessarily
long.

You also don't have to CC the original sender since we all get it
anyway, but that of course is just a personal preference."

Or what do you think? Wouldn't that be clearer?

Otherwise - thank you for all the intelligent contributions! I am learning a 
lot.

Greetings,

Agnes Klingshirn

----- Original Message ----- 
From: <stoves-request at listserv.repp.org>
To: <stoves at listserv.repp.org>
Sent: Thursday, January 31, 2008 7:00 PM
Subject: Stoves Digest, Vol 19, Issue 39

>
> Send Stoves mailing list submissions to
> stoves at listserv.repp.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
> or, via email, send a message with subject or body 'help' to
> stoves-request at listserv.repp.org
>
> You can reach the person managing the list at
> stoves-owner at listserv.repp.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Stoves digest..."
>
>
> Today's Topics:
>
>   1. [Terrapreta] How to make charcoal (Robert Flanagan)
>   2. Re: Kilning firewood -  Wicked! Puffergas (adam u partner)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 31 Jan 2008 08:53:50 -0800
> From: "Robert Flanagan" <saffechina at gmail.com>
> Subject: [Stoves] [Terrapreta] How to make charcoal
> To: "'Discussion of biomass cooking stoves'"
> <STOVES at LISTSERV.REPP.ORG>
> Message-ID: <000001c86429$daf2c880$90d85980$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi All,
>
>
>
> I've just been playing around with my natural draft stove to see how easy 
> it
> would be to use it for cooking and making charcoal
> http://www.youtube.com/watch?v=sZZDtXOiGLE .
>
> I fed some extra fuel in the side so show the pyrolysis reaction taking
> place.
>
>
>
> So at the start I light a fire on top of the biomass to build this hot
> carbon layer, it's during this start up period that we get smoke coming 
> out
> the flue. But when the whole top layer is on fire (So to speak) and we've
> got our hot carbon layer then all gasses coming up must pass through this
> layer and they get broken down and become combustable. The biggest problem
> is always moisture (biomass should have a moisture content of less then 
> 25%)
> and typically we get a white smoke but when water passes through hot 
> carbon
> it reacts to give us H2O+C = H2+CO (Syngas) so we actually burn water 
> along
> with the woodgas. Gasification allows a small amount of fresh air to pass
> through the unburned biomass up to the flaming pryolysis zone and this is
> where get the exothermic reaction to take place. Then the oxygen lean gas
> travels up until it meets the secondary air where it finally has the
> air:fuel ratio correct for complete combustion.
>
>
>
> The reason I was left with just charcoal at the end of the clip is because
> of the restricted amount of air passing up through the charcoal. When we
> have a mix of hot charcoal and unburned biomass the air will always react
> with the unburned wood first so there is no oxygen left to break down the
> carbon. Now at the end I could have opened the bottom and side door and 
> the
> flow of fresh air meeting the hot charcoal would have raised the 
> temperature
> and reduced the charcoal to ash (But then I'd have no charcoal to play
> with!)
>
>
>
> This is very very different to pyrolysis where the biomass is typically 
> high
> in moisture (50%) and the oxygen is restricted. Here the moisture content 
> in
> the gas is way to high to combust so unless the biomass was pre-dried the
> gas typically has to go through a condenser to produce vinegar and 
> bio-oil,
> then the non-condensables should be combustible.
>
>
>
> Regards,
>
> Rob.
>
> -- 
> Robert Flanagan
> Chairman & President
> Hangzhou Sustainable Agricultural Food & Fuel Enterprise Co., Ltd.
>
> Skype "saffechina"
> Tel:   86-571-881-850-67
> Cell:  86-130-189-959-57
>
>
>
> Forwarded from the terra preta discussion list
> http://terrapreta.bioenergylists.org/
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 31 Jan 2008 17:59:24 +0100
> From: adam u partner <scda2 at t-online.de>
> Subject: Re: [Stoves] Kilning firewood -  Wicked! Puffergas
> To: Discussion of biomass cooking stoves <stoves at listserv.repp.org>
> Message-ID: <47A1FE6C.70706 at t-online.de>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Alex and Christine English schrieb:
>
> What's awful?
> Jeff
> -------------------------------------------------------
>
> Ok English is not my language, "awful" might be an improper vocabulary,
> lets put the sentence like this:
>
> "Why not making a little more effort and measuring the efficiency when
> doing such interesting work on a retort charcoal maker?"
> by
> A) to weight the wood before carbonisation
> B) estimating the water content of the wood,
> C) to weight the charcoal received,
> D) calculating the efficiency.
>
> Best
> Chris Adam
>> Jeff,
>> Young Red Pine can have 67% moisture content on a wet bases or 200% on a
>>  dry bases.
>>
>> Alex
>>
>>
> -- 
> - - - - - - - - - - - - - - - - - - - - - -
>
> adam + partner
> Appropriate Technology + Industrial Design
>
> Bahnhofstrasse 13
> 82467 Garmisch
> G E R M A N Y
>
> mobile: +49-(0) 175 528 96 24
> Fax: +49-(0)180 5060 3360 3783
> www.biocoal.org
>
>
>
>
>
>
> ------------------------------
>
> _______________________________________________
> Stoves mailing list
> Stoves at listserv.repp.org
> http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
>
> End of Stoves Digest, Vol 19, Issue 39
> ************************************** 