Re: GAS-L: Sweet Chestnut Gasification

["Paul S. Anderson" <psanders@ilstu.edu>]

Dear Graeme and other "Gasifiers", (with copy to the Stoves list serve)

I am new to this list serve, but have been active for a year on the Stoves 
List serve.  I am working with Tom Reed on a domestic gasifier stove for 
cooking with biomass.  My area of work is southern Africa, specifically in 
Mozambique and where it joins with Swaziland and South Africa.  I head to 
Africa on 4 July for 3 months.

My question is about "chippers".  Graeme makes clear statements about drum 
chippers producing poor quality chips and screw-auger chippers producing 
good quality chips.

Is there a good source of info about these chippers, especially regarding 
making fuel for gasifiers?  I am especially interested in the least 
expensive, and I hope manually powered, but all info will be useful.

Paul

Paul S. Anderson (full signature block info should be at the end of this 
message.)

At 03:34 PM 6/14/02 +1200, Graeme Williams wrote:
>Hello Rebecca,
>
>Sweet Chestnut should not cause any problems if used for down draught
>gasifiers.  As with all woods used for gasification, the moisture content
>should be as low as possible (15 - 20%) and you need to closely monitor the
>chip size.
>
>The big trap for most projects drawing wood from city forestry, is the use
>of drum chippers which make a lot of fines and is very poor gasifier fuel. I
>am pretty sure there was a lot of chestnut chipped at Rural Generations
>Brook Hall Project in Londonderry following Winter gales a couple of years
>ago and there were no unusual problems, although it was mixed with other
>hardwoods.
>
>Make sure you use a screw auger chipper with a medium size chip (50 x 25 x
>5) and it should work fine.
>
>Problems with coppice willow gasification can be overcome with a correctly
>designed gasifier, and again the correct cutting size of the chip.  If you
>haven't done so, you can read about our work with the fuel on the Fluidyne
>Archive www.fluidynenz.250x.com
>
>Hope this helps
>
>Doug Williams
>FLUIDYNE GASIFICATION
>
>
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Paul S. Anderson, Ph.D.,  Fulbright Prof. to Mozambique 8/99 - 7/00
Dept of Geography - Geology (Box 4400), Illinois State University
Normal, IL  61790-4400   Voice:  309-438-7360;  FAX:  309-438-5310
E-mail: psanders@ilstu.edu - Internet items: www.ilstu.edu/~psanders


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http://www.crest.org/articles/static/1/1011975339_7.html Gasification
http://www.crest.org/articles/static/1/1011975672_7.html Carbon