[Terrapreta] Overview on biochar production methods

[ENVIPOWER]

Tom,
This is not an easy answer, since it relates to the gasification setup in
the gasifier step. In the test runs back then we were not aiming at char
production - it just happened and we started thinking of the use of the
charcoal. All commercial units build since have been running around
stoichiometric settings and I haven't been involved.
These days we turn back to the initial concept and we ran one of the
delivered commercial units in gasification mode in 2005.  We should have a
new modified version up running at the turn of the year at one of our
customer's farm running on agro-residues and straw.
Best regards/Med venlig hilsen
ENVIPOWER AS

Nils Peter Astrupgaard
Snerlevej 1 DK-2800 Kgs. Lyngby
+45 4061 5600
npa at envipower.dk www.envipower.dk 




_____________________________________________
From: Tom Miles [mailto:tmiles at trmiles.com] 
Sent: 16. august 2007 19:12
To: 'ENVIPOWER'; terrapreta at bioenergylists.org
Subject: RE: [Terrapreta] Overview on biochar production methods

Nils,
I have a picture from my visit to Lyngby in 1993 that shows healthy weeds
growing in your straw char. 
When you run the Indumatic boiler in two staged combustion how much char
(kg) can you make per kg fuel input or per KW thermal output? 
Thanks
Tom 




		- and why not add us to the list. We already produced the
low temperature char in 1993 in our gasification stage in order to hold back
alkali metals (= fertilizer) from straw. We just didn't know what
agriculture would say to such a carbon rich product even though there
already was a discussion on C depletion of the Danish farm land.
		After the recent establishment of ENVIPOWER we learned about
TP and that was the answer to our question. We have just got a rather small
amount of money allocated to smaller agricultural experiments carried out by
"Faculty of Agricultural Sciences" http://www.agrsci.org/content/view/full/2

		We will off course report to the list of our findings.
		Best regards/Med venlig hilsen
		ENVIPOWER AS
		Nils Peter Astrupgaard
		Snerlevej 1 DK-2800 Kgs. Lyngby
		+45 4061 5600
		npa at envipower.dk www.envipower.dk 
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