Re: "Formula for Biomass" and Charcoaling....

["Ron Larson" <ronallarson@qwest.net>]

Alex:

    It has been a while since I had seen the data you identified below.  You
sure do nice work (I recommend strongly others looking at that data).

    My questions to both you and Tom (and anyone else):  I would guess that
the various grades of charcoal depend on time as well as temperature - and
believe that Tom's work with SeaSweep requires control of both.  I have read
a doctoral thesis with several thermocouples inside the pellet as it is
pyrolyzing - and know the inside of the pellet is of course always lagging
behind the outside (which you are measuring).   So the questions are:
Shouldn't we also be worrying about time - and is the peak outside
temperature the right one?

    I also hope we can find a low-cost (or free) means of chemical analysis.
Any volunteers?

Ron

----- Original Message -----
From: *.English <english@adan.kingston.net>
To: <Reedtb2@cs.com>
Cc: <stoves@crest.org>
Sent: Monday, January 07, 2002 5:45 AM
Subject: Re: "Formula for Biomass" and Charcoaling....


> Dear Tom,
> My tests on IDD stoves have recorded  fuel temperatures of 600 to 800
> C depending on primary air (superficial) velocities through the fuel.
> http://www.ikweb.com/enuff/public_html/bigtop/bigtop2.htm
> show a peak pellet temperature of 800 C when using a blower, which is
> the temperature as the pyrolysis front passes the thermocouple.
> When using natural draft the corresponding peak is around 600 C.
>
>  So according to your guidelines below, I have been producing
> metallurgical charcoal with natural draft and activated charcoal when
> I use forced air.
>
> Where is the lab that could give me a complete charcoal appraisal?
>
>  Alex
>
> > Torrefied wood; Sea Sweep (oil absorbent); Cooking charcoal;
mettalurgical
> > charcoal; activated charcoal
> >
> > corresponding to driving off 0.1, 0.2 etc. waters.... at temperatures of
> > 275; 360; 425; 600 and 800 C.
> >
> > Yours truly,              TOM REED
> >
> >
> >
> > In a message dated 1/3/02 11:22:40 PM Mountain Standard Time,
> > pverhaart@optusnet.com.au writes:
> >
> >
> > >
> > > Stove dried wood contains about 50% carbon (at least I think that was
the
> > > rule of thumb we adopted). Next we assumed the rest was H and O in the
> > > proportion of water. This gives .
> > > Nobody suggests this is accurate but works in the world of stovers.
> > > There was a staff member at Eindhoven (not in our faculty, I am happy
to
> > > say), who explained the charcoal making process as driving off the
water.
> > > If things were only that simple.
> > >
> > > Piet
> > >
> >
> >
> >
> >
>
> -
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-
Stoves List Archives and Website:
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http://www.ikweb.com/enuff/public_html/Stoves.html

Stoves List Moderators:
Ron Larson, ronallarson@qwest.net
Alex English, english@adan.kingston.net
Elsen L. Karstad, elk@wananchi.com www.chardust.com

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Other Biomass Stoves Events and Information:
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http://solstice.crest.org/renewables/biomass-info/
http://solstice.crest.org/renewables/biomass-info/carbon.shtml

For information about CHAMBERS STOVES
http://www.ikweb.com/enuff/public_html/Chamber.htm