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

[AJH <andrew.heggie@dtn.ntl.com>]

On Mon, 7 Jan 2002 07:45:38 -0500, "*.English"
<english@adan.kingston.net> wrote:

>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.

Alex, you will see I may have to change my thinking here, when running
on minimum primary air was 600C the lowest figure you recorded? I have
not used thermocouples in the stove, just crayons outside and I was
thinking I had lower temperatures, but this may have been down to heat
loss through the tube walls.
>
> So according to your guidelines below, I have been producing 
>metallurgical charcoal with natural draft and activated charcoal when 
>I use forced air.

Was there much yield difference between forced and natural draught?
>
>Where is the lab that could give me a complete charcoal appraisal?

Here we have a lab that will sample for ash, sulphur, and gross
calorific value at GBP18 per sample. From this a decent deduction of
retained volatiles could be made.

More sophisticated test for heavy metals
(Sb,As,Cd,Cr,Co,Cu,Pb,Mn,Hg,Ni,Tl,Sn & V) costs GBP71

And I think I do know what these abbreviations are for!

I am sure there are similar one's there.

AJH
>
> 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 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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http://solstice.crest.org/renewables/biomass-info/carbon.shtml

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