[Terrapreta] Terrapreta Digest, Vol 11, Issue 70

[Greg and April]

Ok, how does one make a high pressure kiln - I keep having this vision of a 
metal box with a presser relief valve that opens once it reaches a certain 
pre set pressure.

Greg H.

----- Original Message ----- 
From: "Nikolaus Foidl" <nfoidl at desa.com.bo>
To: <terrapreta at bioenergylists.org>
Sent: Thursday, December 27, 2007 14:10
Subject: Re: [Terrapreta] Terrapreta Digest, Vol 11, Issue 70


> Dear Gerhard!
>
> I only heat the Wood up to 280 degrees Celsius .In my atmospheric kiln 
> this
> takes some 3 hours. ( Gas outlet temperature from the gas tube). I still
> don't know how many time it will take on my new high pressure kiln. The
> torrefied wood is very brittle as most of the hemi cellulose is already 
> gone
> and the cellulose is partially charred.